archived-dots

[rustic rain]

Reload

It's in migration guide in manual

[void girder]

This?

[rustic rain]

Look it up in manual

I'm far from PC to look it up

[void girder]

I don't see anything about domain reload in this migration link: https://docs.unity3d.com/Packages/com.unity.entities@1.0/manual/upgrade-guide.html

Unless there's another guide

[rustic rain]

https://docs.unity3d.com/Packages/com.unity.entities@1.0/manual/getting-started-installation.html

Here

[muted star]

Now my Unity editor keeps crashing when using ECS 1.0.
I think I'll stick with 0.51 for now :p

[void girder]

Mine is crashing quite a bit too

[muted star]

Code in the foreach body always runs on the main thread
Does anyone know if this will this change with the full release of ECS 1.0?

[rustic rain]

No

That's the whole point of query

[muted star]

wdym?

[rustic rain]

SystemApi.query

Is just boilerplate help for manual chunk iteration

Main thread only

[muted star]

Ah

so on that point Entities.ForEach was better

weird

[rustic rain]

It's not same

Entities.ForEach is swapped with IJObEntity

[muted star]

Is it normal that the burst compiled code is different in builds than in the editor playmode?
Could MethodImpl AggressiveInlining cause differences?

[clever cobalt]

Is there something like ComponentLookup<> but for aspects? or is it just better to have many ComponentLookup<> in jobs?

[rustic rain]

Yes. There are several options for burst compilation. Speed vs build time

You can find it in preferences I think or Project Settings

Burst AOT settings

[rustic rain]

Aspects generate their own

Try TransformAspect.TypeHandle

[clever cobalt]

Thanks, i'll have a look into it

[dull shell]

idk where to ask so i ask it here, general ECS question, not specifically DOTS
can i store some static data somewhere? for example i need to make simple timer in my system, but system cant have state, i can make component and entity just for that timer and that system, but its kinda strange, is there any other ways?

[rustic rain]

Entity related data should belong on component

If it's Singleton per machine - static will do

Otherwise

It's fine to store inside systems too

Assuming it's one timer per world

I also use a Singleton struct per world mini feature by mr

Me

#archived-dots message

[dull shell]

yes, its singleton, one per world, i guess i just put it into my system then

[rustic rain]

That's one way

#archived-dots message

Found final solution

I like to have data available to all systems

Without having to get specific systrm

Thus I made this little feature

[dull shell]

i dont rly understand how it works, im not using dots

[rustic rain]

Just a pointer reference to struct

Which gets created or gotten from cache

Alternative to storing data into Singleton entity

[jolly palm]

Not a fan of static singletons, since they are made with the explicit intent to work outside your dependency scructure, which makes them hard to debug and manage.

[rustic rain]

My implementation uses native reference which has thread safety. But yeah, no dependency since no entities involved

[rotund token]

It's only safe to read though

Which is fine if that's the only intention

[gusty comet]

The discussion in this thread https://forum.unity.com/threads/isystem-vs-systembase.1357655/ implies that the overhead of scheduling jobs is quite large, and that for most cases if the workload is small, using ISystem is preferable. I’d like to ask though what’s the general cutoff for a job’s workload being too big or small? Plus, wouldn’t offloading work to worker threads be a priority?

Maybe a better question is: what performance test results would warrant shifting some smaller jobs into ISystem?

[rustic rain]

Not really. I want to be able to modify value from jobs tbh.
Just set bool to true basically

[rotund token]

Well that implementation won't allow it because it's outside the dependency chain

[rotund token]

Imo always schedule jobs

But just do it from ISystem

It's much improved in 2022

[gusty comet]

I didn’t know that was possible. Thanks, so burst compiled job scheduling removes a lot of the overhead?

[rotund token]

people often benchmark this in isolation and see that running main thread is faster and completely overlook the cost of sync pointing your entire dependency chain

I think a more interesting determination is whether to schedule parallel or not

Parallel is definitely overused

I should say scheduling threads vs main thread does depend on your game and platform

If you had only dozens of entities total targeting low end android devices, maybe consider just running everything main thread

[gusty comet]

Thanks, this is great info

[jolly palm]

Isn't that more of an issue with using ECB than parallel jobs?
if ECB has to wait for sync points why does it matter if you are scheduling parallel or not?

[rotund token]

well yeah you should avoid ecb for the same reason you should avoid executing code on main thread

[jolly palm]

I'm confused. I thought it was good practice to offload your work to jobs with an ECB to write changes back

[rotund token]

even better to not have to use the ECB

but yes that is standard practice

but the topic was about not scheduling jobs and instead just running it on the main thread inside a bursted ISystem

[jolly palm]

Oh right. You use a bursted ISystem Update directly instead of the overhead of adding jobs.

I'm still confused what you mean by better to not have to use ECB?
Isn't the alternative to made a change immediately, causing a sync point?

[rotund token]

what i mean is don't make avoid making structural changes

[gusty comet]

What if I use the ECB to offload component enable/disable?

Iirc component enable/disable using other means would count as a write dependency

So I’m currently planning on doing component enable/disable using ECB so that jobs that enable/disable a certain component could run in parallel

[rotund token]

sometimes you just have to use it

and that's fine

[jolly palm]

OMG for some reason I thought changing component values was a structural change. I can't believe I thought that

[frigid crypt]

Any Idea why it won't let me do this?

I saw a tutorial on youtube from a week ago where it is used

[rotund token]

do you have physics/netcode in your project?

[frigid crypt]

physics yes

[rotund token]

this is the new V2 transform system but currently physics/netcode dont support it

so you can't use it yet if you're using them

you have to stick with the old transform/rotation components

[jolly palm]

That sucks

[muted star]

Hi everyone, I already asked this yesterday but I'm still wondering how it's possible to bake / IConvertGameObejctToEntity to a specific world.
Apparently the new netcode solution bakes to different worlds but I couldn't find out how they did it.

I think for now I'll just bake to the default world and move entities with specific tags to other worlds afterwards.

[rustic rain]

Just load subscenes manually

Based on world

[muted star]

Thanks, I'll try that

sounds neat

[rustic rain]

Do you already use some sort of filtering on systems?

Based on which world it belongs to

[muted star]

I add systems to worlds based on namespace

or do you mean a different kind of filtering?

[muted star]

My systems in different worlds don't necessarily have different queries

[rustic rain]

Yeah, since you create different world for different purposes

I assume you have different sets of systems

[rotund token]

i believe netcode / entities will support baking to specific scenes (or at least baking multiple ways with different configs) in the future

but this is not supported out of the box yet

there's a lot of mention in the backend though for it

[queen dome]

Is there way to display any physics debug info when using Unity Physics?

[rustic rain]

Yes

There's a component

Attach it to go in subscrene

Physics Debug key words

Can't remember exact name of monob

[queen dome]

thank you

[trail valve]

Hi guys, I have a question about Aspect, I have a DynamicBuffer feild in this Aspect, but Aspect only allow to use readonly. So how can I modify a element in that DynamicBuffer?

[naive eagle]

readonly means that the DynamicBuffer reference can't change, but its contents can still change. Have you tried it?

[trail valve]

Is this correct? I have tried but it doesn't work

[muted star]

When I load subscenes to specific worlds in 0.51 I can't see the entities within those worlds properly.
This subscene only has one entity with a name but instead it shows 3 nameless entities.

When I open the subscenes in the editor the entities are displayed correctly but then the subscenes seem to be loaded to all worlds.

Is this actually the case? Is the editor loading subscenes to all worlds or is this just a bug in the editor UI?

Different question:
Is it a good idea to .gitignore the SceneDepencyCache folder?

[muted star]

You could remove the element and insert a new one in its place. Idk if that's the best way to do it though.
With RemoveAt and Insert

[muted star]

What's the error message?

[rustic rain]

Yes. That's how it works sadly

No names for closed subscrnes

And no proper logic for open subscenes

[muted star]

Is it the same in 1.0?

[rustic rain]

Yes

[muted star]

wtf

[rustic rain]

Yep

Just get used to work with subscrnes without names I guess 😅

[muted star]

How do I create an extra entity in the IConvertGameObjectToEntity Convert method?
This is how I tried it and the extra entity with the SolidStrobeLightTag is shown as None (Entity) in the DOTS Hiererachy

public class StrobeLightPrefabMono : MonoBehaviour, IConvertGameObjectToEntity
    {
        public void Convert(Entity entity, EntityManager dstManager, GameObjectConversionSystem conversionSystem)
        {
            var prefab = dstManager.CreateEntity();
            dstManager.AddComponent<SolidStrobeLightTag>(prefab);
            
            dstManager.AddComponentData<StrobeLightPrefab>(entity, new() {Value = prefab});
        }
    }

I can't find any docs on IConvertGameObjectToEntity :p

[hot basin]

Do I need to recreate TransformAccess for it's job every frame?

[muted star]

I figured it out. I think this would be much simpler in 1.0.

public class StrobeLightPrefabMono : MonoBehaviour, IConvertGameObjectToEntity, IDeclareReferencedPrefabs
    {
        [Required] public GameObject Prefab;
        
        public void DeclareReferencedPrefabs(List<GameObject> referencedPrefabs)
        {
            referencedPrefabs.Add(Prefab);
        }
        
        public void Convert(Entity entity, EntityManager dstManager, GameObjectConversionSystem conversionSystem)
        {
            var prefab = conversionSystem.GetPrimaryEntity(Prefab);
            dstManager.AddComponentData<StrobeLightPrefab>(entity, new() {Value = prefab});
        }
    }

[rustic rain]

CreateAdditionalEntity in system

[muted star]

CreateAdditionalEntity also requires a GameObject as argument so it's just as akward I think

[trail valve]

Error message: Struct 'this' reference is immutable in 'readonly' structs. Cannot modify struct member when accessed struct is not classified as a variable

[trail valve]

I also tried this way, but it doesn't work too

[muted star]

Sorry idk, I haven't used aspects yet. Perhaps RefRW<DynamicBuffer<StatDataElement>>> works or DynamicBuffer<RefRW<StatDataElement>>>

[viral sonnet]

can you show the full code? is this an ijobentity?

[rotund token]

probably

[stone osprey]

Is there something similar like unitys job system for plain c# ? Like a lib or framework ?

I actually found a couple of different "job" libs, however those were quite bloated and not intended for highperformance usecases... so i wonder if i missed any ( since thats actually quite easy, most wont show up on google )

[rotund token]

just use Tasks? async/await etc

[trail valve]

Here is the full code, I'm creating a Aspect and trying to modify a element of a dynamic buffer

[stone osprey]

Not very highperformance... Too many allocs and stuff ^^

I hope that theres anything similar to unitys way of processing jobs

[rotund token]

unity jobs aren't that performant

unless you use burst

[stone osprey]

They arent ? 😮

[viral sonnet]

hm, i have no aspects but unity has this testcode: ```readonly partial struct AspectWithDynamicBuffer : IAspect
{
public readonly DynamicBuffer<MyBufferElement> MyBuffer;

    public TestData Read(TestData data)
    {
        data.Data = MyBuffer[0].Value;
        ++data.OperationCount;
        return data;
    }

    public TestData Write(TestData data)
    {
        if (MyBuffer.Length > 0)
            MyBuffer.RemoveAt(0);
        MyBuffer.Add(new MyBufferElement { Value = data.Data });
        ++data.OperationCount;
        return data;
    }
}```

[orchid ginkgo]

You can use managed data inside jobs by creating a GCHandle, here's a blog with more details https://coffeebraingames.wordpress.com/2019/03/17/run-managed-code-in-unitys-job-system/

[trail valve]

oh, I don't know that, let me try this way. Thanks

[viral sonnet]

oh that's pretty cool actually. haven't thought of doing it this way.

i think the lateUpdate that just frees the handle could move to Update before ScheduleTask so just previous jobs get freed and save a .Complete call

[orchid ginkgo]

You can also create a separate Job that frees the handle(s)

[rotund token]

you can also use managed code in jobs fine as long as you aren't passing it in

[orchid ginkgo]

The docs say that Unity will eventually forbid static data inside jobs, who knows if they'll ever actually implement that though https://docs.unity.cn/2022.1/Documentation/Manual/JobSystemTroubleshooting.html#:~:text=Because of this risk%2C future versions of Unity will prevent global variable access from jobs using static analysis

[rotund token]

i'm not meaning static data

i simply mean something like
Execute() { var myClass = new Class(); }

(obviously not bursted)

Do not allocate managed memory in jobs

Allocating managed memory in jobs is incredibly slow, and the job is not able to make use of the Unity Burst compiler to improve performance.
does warn you about it being slow though

[orchid ginkgo]

I wonder if that's because of managed allocations being slow in general or if it's because of some particular implementation detail of the job system

[rotund token]

not sure

it is useful though if you need to do a single managed operation at end of job chain

that works fine in a thread

[rustic rain]

The reason behind Unity ECS and Jobs usage - burst

Both made with it in mind

[light mason]

Can someone please point me to some documentation on how to set Material properties.

Can I only used SystemBase for material overrides ?

[rotund token]

material overrides are just components with the [MaterialProperty] attribute

you can set them anywhere

https://docs.unity3d.com/Packages/com.unity.entities.graphics@1.0/manual/material-overrides.html

that and check out the samples (linked from the above link)

(you can also set them up via authoring and the material override asset)

[light mason]

Thank you

Does ISytem not show timing info

that arrow is meant to point at the empty space

[rotund token]

timing info is a bit useless anyway

and often leads to the wrong conclusion

it's only main thread timing, not the cost of actually running its jobs

it usually all just stacks up on the first sync point

should just use profiler for actual timing

[muted star]

Is there a less convoluted way to set up prefabs with IConvertGameObjectToEntity?

public class SimulationUnitPrefabMono : MonoBehaviour, IConvertGameObjectToEntity, IDeclareReferencedPrefabs
    {
        [Required, SceneObjectsOnly] public GameObject EmptyGameObject;
        
        public float MetersPerMS = 0.1f;
        
        public void DeclareReferencedPrefabs(List<GameObject> referencedPrefabs)
        {
            referencedPrefabs.Add(EmptyGameObject);
        }
        
        public void Convert(Entity entity, EntityManager dstManager, GameObjectConversionSystem conversionSystem)
        {
            var prefab = conversionSystem.GetPrimaryEntity(EmptyGameObject);
            
            dstManager.AddComponent<Prefab>(prefab);
            dstManager.AddComponentData<TraversalPropertiesDC>(prefab, new() {MetersPerMilliSecond = MetersPerMS});
            dstManager.AddComponentData<SimulationUnitPrefab>(entity, new() {Value = prefab});
        }
    }

[devout prairie]

You don't need to add the Prefab component, i can tell you that much

The other components you're adding, can be setup with an authoring ICGOTE component on the prefab gameobject itself -

say you have SpaceshipAuthoring, applied to a spaceship prefab, it can add all the relevant spaceship components and will run at conversion time

but still use a ICGOTE script like you have above to actually pull in and create prefabs

So just to explain what i mean, this is how i currently do it.. ( bearing in mind this is all anathema in dots 1.0 which uses bakers and subscenes ):

I have one gameobject in my scene holding my main IDeclareReferencedPrefabs mono:

It pulls in a ScriptableObject which holds all of my object data and gameobj prefabs..

It then iterates that scriptable database and parses it to a Blob, and creates a singular PrefabBlobComponent entity which holds a reference to the data blob:

The blob also takes references to the prefab primary entities:

On the prefab gameobjects themselves, i have specific conversion mono's which add components etc specific to that asset:

[muted star]

I need to add the prefab component or else it would participate in entity queries.
(I'm using ICGOTE within subscenes for best possible future compatibility with ECS 1.0)

[muted star]

Yea but I though it would be simpler to just have a single MonoBehaviour which takes care of the prefab setup.

[muted star]

Interesting approach, I wonder if something like this would also work in ECS 1.0.
Thanks for your explanation.

[stone osprey]

One job can have multiple dependencies right ?

[rustic rain]

You combine it into one before schedule

[stone osprey]

Thanks ^^ secondHandle.Schedule(firstHandle) does not block & wait... or does it ?
I mean if the secondHandle depends on the firstHandle, than it would make sense to schedule it after the firsthandle was completed... or whats the intentional behaviour ?

[rustic rain]

Job will wait until all input deeps are resolved

That's about it

[stone osprey]

Alright so Schedule(firsthandle) will actually block the main thread till the firsthandle was completed ? And than after it was completed the secondHandle will be scheduled ?

[rustic rain]

No blocking

Job will be scheduled to run only after firstHandle is done

[stone osprey]

Ah i see... so after the firstHandle is done, the scheduler looks up which jobs should run next and executes them ?

[rustic rain]

You schedule jobs that run either in full parallel

If all input deeps are default

Or with rules based on which jobs depend on which job handles

[stone osprey]

Oh alright thanks, thats pretty cool ^^ Thats why my code doesnt work as intended xD

I wonder how it works under the hood, how is it possible to combine multiple jobhandles ? Atleast in theory... i know c# WaitHandles and i dont remember any way to combine them xD However i guess unity uses something else right ?

[rustic rain]

It's c++ internal

But it's easy to figure how it can be done

Tons of ways to achieve that behavior

[tepid stream]

Does anyone know why I can't see my instantiated entities?

[rotund token]

you have entities graphics package installed right?

using urp or hdrp?

[tepid stream]

urp

[rotund token]

entities 1.0?
is your shader/material supported?

i would suggest try getting a basic cube to render

[naive eagle]

Try opening the Preferences window (Edit > Preferences...) then on the Entities tab make sure "Scene View Mode" is set to "Runtime Data" not "Authoring Data"

[tepid stream]

Yup that worked, thanks

[rotund token]

Has anyone looked closely at the enabled implementation?
If I'm reading this right, all components regardless if they are flagged as enabled have a bit flag stored in the chunk header

        {
            return ComponentEnabledBits + (ComponentCount * chunkIndex) + typeIndexInArchetype;
        }```

this would make my serialization/deserialization much easier because i don't need to check the component

and i can always write back the flags regardless if they're valid or not

and if someone added/removed enabled in future it'll maintain backwards compatibility

[devout prairie]

the Prefab component should be added automatically as it's a referenced prefab..

What's the correct way to construct a CompositeScale component float4x4?

[pliant pike]

random question but is there a way to directly just get all entities that are in a collsion filter, belongs to type?

[hollow sorrel]

anyone know if entitiesjournaling.initialize is still internal in 1.0?

annoying that most world init related things are internal

[rotund token]

why would you need to call this?

[hollow sorrel]

i'm getting errors that are saying "enable entitiesjournaling for more helpful error messages"

[rotund token]

EntitiesJournaling.Initialize()
is called on world creation

[hollow sorrel]

but not using defaultworldinit which seems to be the one place where it's being init and shutdown

[rotund token]

if you have a world, any world (even editor)

it's been initialized

        {
#if (UNITY_EDITOR || DEVELOPMENT_BUILD) && !DISABLE_ENTITIES_JOURNALING
            EntitiesJournaling.Initialize();```

it just means you haven't been recording

have you turned it on?

[hollow sorrel]

lemme try

[rotund token]

also you can toggle recording in the journaling window

(it seems to turn off by default entering play mode, not sure why)

[hollow sorrel]

i still get the 'enable entitiesjournaling for a more helpful message'

also no journaling window, i imagine that's 1.0

also don't see any entitiesjournaling inits in World.cs if that's where you mean

only place i see it is defaultworldinit

[rotund token]

ok

not 1.0

[hollow sorrel]

also on 0.51? is it supposed to be under windows > DOTS?

[rotund token]

it still gets called in 0.51

in World

        {
            RegisterUnloadOrPlayModeChangeShutdown();

#if ENABLE_PROFILER
            EntitiesProfiler.Initialize();
#endif

#if (UNITY_EDITOR || DEVELOPMENT_BUILD) && !DISABLE_ENTITIES_JOURNALING
            EntitiesJournaling.Initialize();
#endif```

[hollow sorrel]

no i mean toggling the window

or did you mean window is 1.0

[rotund token]

there is no window in 0.51 - full journaling isn't a feature until 1.0

you can only really browse it in 0.51 by using a break point

and inspecting the entity

(it will debug some info out from ECB failures though)

[hollow sorrel]

isn't this code from DefaultWorldInitialization.cs?

that's where I'm seeing it

/// <summary>
        /// Initializes the default world or runs ICustomBootstrap if one is available.
        /// </summary>
        /// <param name="defaultWorldName">The name of the world that will be created. Unless there is a custom bootstrap.</param>
        /// <param name="editorWorld">Editor worlds by default only include systems with [ExecuteAlways]. If editorWorld is true, ICustomBootstrap will not be used.</param>
        public static World Initialize(string defaultWorldName, bool editorWorld = false)
        {
            RegisterUnloadOrPlayModeChangeShutdown();

#if ENABLE_PROFILER
            EntitiesProfiler.Initialize();
#endif

#if (UNITY_EDITOR || DEVELOPMENT_BUILD) && !DISABLE_ENTITIES_JOURNALING
            EntitiesJournaling.Initialize();
#endif

i'm not using DefaultWorldInitialization

am just doing new World()

[rotund token]

oh you are right

it's kind of required to call DefaultWorldInitialization.Initialize

[hollow sorrel]

ahh

why's that

[rotund token]

because it sets up things like this ^_^'

[hollow sorrel]

wow i see now there's a whole bunch of internal stuff in there, that sucks

[rotund token]

you're meant to implement ICustomBootstrap

to override default world setup

[hollow sorrel]

can i use that without having unity update my world?

[rotund token]

yes

if you implement ICustomBootstrap it won't do anything

if you want unity to update your world from ICustomBootstrap you have to
ScriptBehaviourUpdateOrder.AppendWorldToCurrentPlayerLoop(world);
yourself

[hollow sorrel]

alright i'll look into that, thanks!

[rotund token]

if you don't add it to the playerloop, it won't update it

[brave field]

Anymore tried latest burst 1.8.1 at dots 1.0?

[rotund token]

been using it for a while

[dense crypt]

Hey guys, given a simple weapon system how do I store state that doesn't change? Say a gun "Foo Pistol" has Ammo and Max Ammo. Ammo will change as you play and shoot, but Max Ammo will not. Do I store Max Ammo as a component, or do I maybe store it on say a ScriptableObject (blob asset?) and then access that from runtime? What are your guys thoughts on this type of "config data (data that doesn't change and is same for a specific thing)"

Also if storing Max Ammo as a component, wouldn't I just be storing duplicate state when I have multiple Foo Pistol?

[rotund token]

i would never store anything at runtime on a scriptable object

you have 2 options

• store it on component
• store it on a blob

storing it on a blob means the same value will be shared across a lot of entities so you aren't duplicating state anymore

however it costs 8 bytes to store a blob so for 1-2 int/float field you aren't saving any memory, just increasing it

so if you were only storing max ammo in the blob not worth it, just store it on a component

if you have more configuration than just max ammo then it makes sense to store it in a blob asset

it's basically the point of htem

immutable data that is shared across multiple entities

[hot basin]

wtf, I read on the forum that you can add components to system itself?

[rustic rain]

you mean on their entities?

[hot basin]

each systems have their entity?! XD

is it 1.0exp feature?

should I use it or rather it's not recommended?

[hot basin]

i mean GetComponentData<T>(SystemHandle) and SetComponentData<T>(SystemHandle, T)

[rustic rain]

🤔

[rotund token]

Yes

It's quite useful

[hot basin]

yeah, now I don't need most of my singletons

I can leave only those which are used in multiple systems

[rustic rain]

        public static void SetComponentData<T>(this EntityManager manager, SystemHandle system, T componentData) where T : class, IComponentData
        {
            var access = manager.GetCheckedEntityDataAccess();
#if ENABLE_UNITY_COLLECTIONS_CHECKS || UNITY_DOTS_DEBUG
            if (system.m_WorldSeqNo != access->m_WorldUnmanaged.SequenceNumber)
                throw new InvalidOperationException("System is from a different world.");
#endif
            var type = ComponentType.ReadWrite<T>();
            access->SetComponentObject(system.m_Entity, type, componentData);
        }

I took a look

and it's literally just adding data to entity

what's more, it adds managed data it seems

ah nvm, it also works with unmanaged

but still, all it does - add data to entity

[hot basin]

but before there was no system entity to add to

this feature includes SystemBase or is it only for ISystem?

[rustic rain]

any

all systems have their SystemHandle now

as entity

[rotund token]

Under the hood it doesn't work any different to normal entities, for now

it's more about the principle

[hot basin]

which one? stateless systems?

[muted star]

Yea, at first I got a lot of crashes but it was due a library I had installed.
Ever since I deleted the library yesterday I didn't have any major issues.

[gentle osprey]

Am I reading the Unity Physics package documentation right, that you're only really supposed to do raycasts in the PhysicsSystemGroup? Or am I missunderstanding it? https://docs.unity3d.com/Packages/com.unity.physics@1.0/manual/interacting_with_physics.html#physics-data-types

[rotund token]

If you want perfect results yes

Often it doesn't matter though

[rustic rain]

what are the risks of doing it outside of this group then?

[gentle osprey]

Ah ok, would I need to care about it if I want accurate raycasts, but everything I wan to raycast against is static? And nothing gets destroyed after it's created

[rotund token]

If you destroy an entity and you're ticking than the physics world you will still get it in your results

[rustic rain]

ah

so should be ok within same fixed step

generally

[rotund token]

Or is you create an entity or won't exist until physics run

[rotund token]

Yes? But this is for casting outside of fixed update

I personally just update the bvh every frame of the physics hasn't ticked

This way my spatial map is always accurate

(simulation is not updated though)

[gentle osprey]

If I have a completely static world, with data that can't change position, only entities that can be enabled/disabled. Can I then just update the BVH when I enable/disable an Entity? @rotund token

[rotund token]

Yeah v riding did something similar

Changed how he bvh updated (or more like, stopped it updating)

For all their statics

[gentle osprey]

Huh, Good to know. Thanks for the info :)

[dense crypt]

Is there any performance concerns with using blob assets or should it be nearly the same as accessing a component, but with pointer lookup as well? I understand their concept but never used them on something yet

[rustic rain]

blob is pointer to memory, yes

so

[viral sonnet]

kind of annoying we have to edit the physics package to stop updating static physic objects

[rustic rain]

it's not as fast as having data on component

[muted star]

The only thing that seems to fix this for me is to either remove all gameobjects from the subscene and re-adding them again,
or to simply open the scene belonging to the subscene and re-saving it.

[muted star]

If that doesn't fix it restarting the editor seems to be the last resort. Quite annoying :p

[coarse turtle]

https://docs.unity3d.com/Packages/com.unity.logging@1.0/manual/getting-started.html saw this recently - looks like it has burst support based on the getting started page? Might give this a try 🤔

[rotund token]

It's been around for quite a while but yeah if you're looking for like a full logging library like log4net should work well

I haven't looked at it since pre 1.0 but it appears like it's been greatly improved

Maybe I will revisit it myself

[coarse turtle]

cool - yea I'll take a look later tonight/tmr since I only saw it via the changelog through the transport layer

[rotund token]

wow ok this works a bit different to the last time i looked

it codegens custom method overrides for you

seems to use incremental as well

very fast, basically works on the fly 👌

[misty wedge]

I hope they add a method to IJobEntity that sets a shared component filter, I feel it's very counterintuitive to re-write the query just to use a filter..

[mystic mountain]

How come GenerateAuthoringComponent was removed? O.o I thought they intended to decrease boilerplate code not increase it?

[misty wedge]

iirc they said it was a really sloppy implementation for what it did, so it was removed. afaik the plan is to add a proper replacement for it in the future

[rocky dove]

Is it possible to use UI toolkit data binding with entities? Or there has to be a shim between SerializedObject and IComponentData?

[rustic rain]

no need to rewrite though?

SystemAPI should do it, no?

[misty wedge]

Well yes but the query is implicitly embedded in the components that IJobEntity requests in the Execute method

[rustic rain]

under the hood yes, but you can pass your own

I see your point though

having to add just 1 line for filter would be nice indeed

[misty wedge]

yes, but that's what I don't want to do, it's just extra boilerplate

[misty wedge]

yes, just like Entities.ForEach / Query is able to do

[rustic rain]

can't wait for Unity to create some manual on how to add-on to codegen

I think that would be one of the best library features

[misty wedge]

Yeah that would be cool

[stone osprey]

Can i run into deadlocks with unity jobs ?

[rotund token]

It's actually not that hard

[rotund token]

you can't use locks in burst jobs so it's unlikely!

[rustic rain]

I don't doubt it, but I couldn't force myself to figure their codegen all by my own

[stone osprey]

Alright great ^^

[rotund token]

it's more just learning source generators

and there are plenty of tutorials out for that

just load up com.unity.entities@1.0.0-exp.12\Unity.Entities\SourceGenerators\Source~\SourceGenerators.sln

[uncut rover]

Is there any way to check if an EntityManager has been disposed ?

[rotund token]

check the world

EntityManager.World.IsCreated

they are 1:1

[uncut rover]

Yes but every access to the entity manager triggers the GetCheckedEntityDataAccess() and log an error in the console. even accessing the World.

I'm asking because I have bidirectional destruction of the entity and gameobject (for hybrid use).
It works well but every time I exit play mode, I get spamed with error messages in the console

    public void OnDestroy()
    {
        if (!EntityManager.Equals(default))
        {
            EntityManager.DestroyEntity(Entity);
        }
    }

ObjectDisposedException: The Unity.Entities.EntityManager has been deallocated, it is not allowed to access it

[rotund token]

World.IsCreated

then

is this in a system?

[uncut rover]

no, a monobehaviour

[rotund token]

oh yeah

[uncut rover]

and I dont' need the world.

[rotund token]

dont store EntityManager

store world

[uncut rover]

I could cache it but just for that it's painfull ^^

[rotund token]

but this is why i have a hard rule of never accessing entities from MB in my projects

systems can access MB not the other way around

the timings are not compatible

causes huge issues

i'd say we've had at least a dozen different timing cases due to this

and it behaves different in builds than in editor

[uncut rover]

Hmm, you kinda throw a wrench in my next video :/

[rotund token]

we learnt this the hard way

[uncut rover]

Was not aware of those issue and you would like not to share bad practice

[rotund token]

in work project we still access entities from MB

but we have to have layers of checks

and i would personally not recommend this approach

maybe there are safer frameworks to handle this

but we find all sorts of problems with entities being destroyed before gameobjects

or gameobjects async loading

(addressables)

but it's owning entity has already been destroyed

before the gameobject actually spawned

basically have to throw exist checks in everywhere

it's definitely not uncommon for people to do this though

so there's definitely value in a video about it

but i think people should just be aware of the risks with timings

(and i personally won't allow it in my libraries and future projects at work)

[uncut rover]

isn't the issue the other way around true to, where the entity tries to acces a GO that no longer exists ?

[rotund token]

100%

[uncut rover]

I get it's more common with adressables but not all project need adressables

[rotund token]

but i find it to be more reliable with the timings

and i avoid it by attaching the gameobject to the entity when spawned

so if you query the gameobjects + entity/data

the query won't run while the gameobject doesn't exist

you can avoid the missmatched states from your queries

without having to manually check everywhere

GetEntityQuery(typeof(MyComponent), typeof(Animator))

won't return if the animator hasn't been attached (i.e. gameobject hasn't been attached yet)

and if gameobject is only destroyed from entity side

it will never return a destroyed case

[uncut rover]

I do the same thing but have a generic EntityGameObject I attache to all the hybrid go and it that's how I do the bidirectionnal destroy

And for my next video it's actually the GO that create it's entity and manages it.

I think I'm good. In the last video I warned about destruction of one before the other and tried to provide a way to handle it. i'll reiterate the warning in the next video.
There isn't much choice when you need hybrid approach anyway...

[brave field]

Does this statement still true for idiomatic foreach?

[viral sonnet]

yes, best to use RefRO<T> or RW

[gentle osprey]

I've noticed that memory leak tracking, and multiple jobs debugging tools (like forcing stuff to run on main thread) is not present in 2022.2b13, even though I have both the collections and jobs packages installed. Is this the case for any of youas well?

The jobs menu only looks like this, when it should look like this:

[rotund token]

all settings hvae moved to preferences

[gentle osprey]

Aah great, thank you :)

While I kinda liked having them in the jobs menu it's at least good to see that they now reset on editor restart like the burst safety thing.

[rotund token]

yeah as you can see preferences have been added to my pinned window list

though, that's more for constantly clearing subscene caches

[solemn hollow]

since 0.51 old Colliders are beeing converted and are interacting with the DOTS PhyiscsColliders. I used the old colliders to bake a navmesh and the DOTS Colliders for actual physics. Any way to remove the baking of Old colliders?

[rotund token]

interesting

generally you use meshes not colliders for baking navmesh

but i guess that works fine

anyway yeah you can remove them still

just use a baking system that updates after the physics baking systems

and remove them in that

oh wait

i totally missunderstand what you're doing

let me have a quick look, i have an idea how this could be done

[solemn hollow]

I am trying to use the unity tools as much as possible here. they use colliders for navmesh obstacles

[rotund token]

one way would just to be disable the colliders

unity physics seems to ignore disabled colliders

[rotund token]

pretty sure default navmesh setup is to use the mesh from renderers

[solemn hollow]

yes thats an option as well but not in my 2.5D case

[rotund token]

i assume you don't want to edit package?

[solemn hollow]

if i can avoid it

i am also thinking about writing a baker for NavMeshSurface and giving Entities with old Colliders NavMeshBuildSourceComponents. Then build the navmesh at runtime from that

[rotund token]

thats kind of what i do

though i wrote my own replicate of navmesh source stuff

to like double the features

^

with my 'super advanced' options ^_^'

[solemn hollow]

okay i love it ^^

and you are using the navmeshbuilder api with it?

or did you do your own navmesh implementation

do you really merge navmeshes? or do you create links between them?

[rotund token]

i wrapped recast myself

and a bunch of detour

im slowly porting sections to burst over time

but its low on priority

unity just doesn't expose the data enough for me

i needed to get edges of the grid

i've managed to build polygons aroun dthe outside of the navmesh

so i can feed it to my orca simulation

for avoidance with knowledge of the world

[gentle osprey]

Is leak detection broken or something now? I can't get it to trigger in obvious situations.

[rotund token]

what version of unity

[gentle osprey]

2022.2.0b13

[rotund token]

well those aren't going to leak until you do a domain reload i don't think

[gentle osprey]

Pretty sure I've done domain reloads.

[rotund token]

i haven't wrapped the off mesh link stuff yet (i have the stubs in i just haven't needed to yet and I have so much other things to do)

but i do generate tiles of navmesh as seen above for performance

so i can just update small sections at runtime

those auto link together

[gentle osprey]

Jepp, def done domain reloads.

[rotund token]

(dont mind the errors, i opened project first time in a while without opening unity)
i basically just wrapped each section in recast with a native call

so i can go through 1 at a time and slowly port to burst while being able to validate

[solemn hollow]

i needed that too. was pretty annoying to get my playercontroller to smoothly slide on edges of the navmesh.
Recast is not on asset store anymore?

[rotund token]

each of those Recast.X methods are just native calls

[rotund token]

Recast is open source

but its a c++ library

https://github.com/recastnavigation/recastnavigation

it's what unity, unreal and pretty much everything uses under the hood

though they all probably have their own implementations with tweaks etc

[solemn hollow]

hmm okay atleast i got an option more to explore.
atm im still leaning towards writing the baker for NavMeshSurface. Cant be that hard to figure out how to construct NavMeshBuildSources from Meshes/Colliders

[rotund token]

it's not

i posted my solution on the forums like 2 years ago

back when i first wrapped unitys navmesh

before i decided to go my own way

https://forum.unity.com/threads/navmeshsurface-updatenavmesh-with-a-entity.766148/#post-5110340

[solemn hollow]

i remember the thread

[rotund token]

wow

3 years ago

27 oct 2019

time flies

info might be a bit rough due to my improvements since then

but the concept probably fine

https://forum.unity.com/threads/any-tips-on-coding-a-dots-navmesh.1031752/#post-6680821

[solemn hollow]

afaik i only need to feed a list of navmeshbuildsources to BuildNavMesh() and be done with it

[rotund token]

oh yeah i even added it to that popular giant asset

[rotund token]

yeah if you're not doing runtime updating it's so much easier

[solemn hollow]

i wanna do runtime updates. but isnt that just using UpdateNavMesh() with the same list of buildsources?

[rotund token]

yeah

[solemn hollow]

and afaik it incrementally builds it

[rotund token]

but maintaining that can start being a bit of a pain

once things are deleted

it requires same order for hashing otherwise it triggers a lot larger update

[solemn hollow]

hmm dont you think its rather easy if you just query all entities with a NavMeshBuildSource comp and put those components in a list? chunk layout wont change that much right?

i wish youd could make Combined NavMeshSources.

hmm maybe baking a static mesh per subscene and using that as a navmeshbuildsource would be better.

[rotund token]

change a single component

and your order is messed up

what i did was do the first X elements as my static navmeshes

then the next Y elements as the dynamics

[solemn hollow]

so only the end of the list of sources is changing right?

[rotund token]

yes

anyway cant remember why that mattered but i think it only updates the point after the list that diffs

but yeah been 2 years since i looked at this so ah, investigate yourself 😄

[solemn hollow]

thanks for the input! sounds actually really easy right now

[solemn hollow]

StaticOptimizeEntity removes linkedEntityGroup? Not sure i like that. i think LEG has nothing to do with something beeing static or not but more like what composes a static object.

[rotund token]

hmm

wouldn't have expected that

[solemn hollow]

looking at the source i cant find the part where it is deleted / not added ...

[rotund token]

are you sure?

like if it was a prefab with children the children would not spawn

when you spawned parent

leg not added to root objects in subscenes

unless you add it via the authoring component

[solemn hollow]

this is what im seeing. for prefabs its fine

for example i have this in my subscene. id expect homebase to have a LEG so i could destroy everything together.

my actual usecase would be to have a huge LEG on my Level Object in order to be able to add a NavMeshSourceComp to all viable children with ecb.AddComponentForLinkedEntityGroup()

[rotund token]

leg are not added in subscenes

[solemn hollow]

but with this they are?

[rotund token]

Yeah I think there's just a leg authoring component

Never used it though

[solemn hollow]

hmm works but somehow breaks if i click on the object with the LEG

scene stops rendering then 0.o

well i need it for baking only anyways.

[solemn hollow]

You guys have found any good solution to the Adding a component multiple times during baking?

easy example :
i have a projectile component and a cooldown component. both require the AbilityTag to work. Cooldown and Projectile can be present on the same gameobject. ATM i cannot just add the AbilityTag inside both Bakers and be done with it. I need an extra component on the Gameobject adding the Tag exactly once. That component could in theory be missed by someone creating that object since he doesnt know that the tag is required for a projectile to work. (RequireComponent would solve this but still adds clutter to the GO)
I totally see the merit of disallowing it for non tag components since you could overwrite data but for tags it can be really annoying.

[rotund token]

(RequireComponent would solve this but still adds clutter to the GO)
definitely solution to that setup

but yeah i know why it works like this, it's required for live baking/incremental stuff - which baker adds something is important

but i have had a few situations it's a tad annoying

that said, i've basically gone to single authoring components per library feature for the most part

so i it's all configured in 1 place and the baker for it can handle the case - but i still have to write this handling

it's a pain for designers having to remember all the different authoring components you need to add to something new

so i prefer to just group them in 1 place and present it to them

[solemn hollow]

im doing that in all my newer features. my ability system is some old baggage im dragging around. ill need to improve the authoring at some point but dont have the time to do a full UI graph solution atm.
Still i have cases where i want to use some core utility in multiple libraries which might need the same Components for baking... but oh well i can live with RequireComponent for now

[rustic rain]

hmm

I just started to wonder

since new .net MAUI is cross platform

will Unity ever think about making it compatible?

would make so much more sense to just have one native UI framework over tons

especially considering it's also open source

[solemn hollow]

Any easy way of getting the mesh from a PhysicsCollider?
I dont get what i need to supply to the source Object

                {
                    transform = l2w.Value,
                    size = new float3(scale.Value),
                    shape = NavMeshBuildSourceShape.Mesh,
                    area = 0,
                    generateLinks = false,
                    sourceObject = ???
                    component = null
                }; ```

[robust scaffold]

Unity has thrown possibly millions of dollars into UIE. No way will they give up on it.

[rustic rain]

🥲

[solemn hollow]

@rotund token

Cause we talked about baking issues:
Stumbled across this when i looked at LegacyColliderBakingSystem:

                AddComponent(colliderEntity, new PhysicsColliderBakedData()
                {
                    BodyEntity = shapeBakingData.ShapeComputationalData.Instance.BodyEntity,
                    BodyFromShape = shapeBakingData.ShapeComputationalData.Instance.BodyFromShape,
                    ChildEntity = shapeBakingData.ShapeComputationalData.Instance.ChildEntity,
                    // It is a leaf if the Shape Entity equals Body Entity
                    IsLeafEntityBody = (shapeBakingData.ShapeComputationalData.Instance.ShapeEntity.Equals(shapeBakingData.ShapeComputationalData.Instance.BodyEntity))
                });```

i was not aware that we need to add the component inside the baker instead of the bakingsystem to make sure it is correctly removed from baked entities when it is removed from the GO (if i understand the comment correctly here)

That will be a huge source of unexplainable bugs for me

[pliant pike]

I have a weird error I don't understand, is it possible for a collision filter raycast to get the wrong objects, that arent in the filter at all?

it only seems to happen when the ray is cast over another object that does hit the filter though, so does that seem like a bug

[solemn hollow]

i havent encountered that yet. but make sure your subscenes are closed. open subscenes somehow change physics behaviour

[pliant pike]

I'm not using subscenes currently in 0.5 I get weird errors sometimes

[solemn hollow]

did you look at the physicsdebugger component? mabye it can help you visualize whats going on

[pliant pike]

oh yeah that's a good point thanks

[pliant pike]

the collisionfilters really are hard to understand sometimes but maybe its because I've got lots of overlapping ones but then that's what I figured the filters solved 😕

[solemn hollow]

i found it weird that both objects have to detect a collision in order for it to count.

or am i wrong here?

as far as i understood an object1 with BelongsTo:1 and CollidesWith:2 and an object2 with BelongsTo:2 and CollidesWith2 would not trigger Collisions with each other since object 2 cannot collide with Layer 1

i would have expected that object 1 gets collisions here and object 2 does not

but neither get collisions

[pliant pike]

Yeah I think that's how it works

[solemn hollow]

maybe thats how your raycast is not registered on certain objects

[pliant pike]

But I only have it registered to collide with 1 object type

And the other objects don't have it on there collides type

[solemn hollow]

and that one object type also has CollidesWith of what the RayCast belongs to?

[pliant pike]

Nope the raycast is of type raycast which the ground for example does not have a collides with for, for example

[solemn hollow]

sry just to clarify:
Raycast: BelongsTo:RayCastLayer , CollidesWith:RayCastObjects
Objects you want to hit: BelongsTo:RayCastObjects , CollidesWith:RayCastLayer

[pliant pike]

Yeah pretty much

[solemn hollow]

then if its still not hitting id call it a bug

@rotund token any idea how defaultArea of NavMeshSurface is implemented? essentially i want to be able to navigate everything at first and then incrementally spawn colliders into the world that restrict navigation.
Is the defaultArea=walkable just a huge plane that is fed as a buildSource?
The runtime generation is working but i still need to implement the NavMeshModifier features now.

[rotund token]

I don't think they have a default mesh plane

You can certainly add a giant plane though

[solemn hollow]

hmm might be the tilemap collider that is used by navmeshsurface2d then. cant explain that baked plane with any object i created.
But yes i can just add it if its missing. just wanted to make sure i get as close to the navmeshsurface monobehaviour as possible.

[jolly palm]

Is there currently support for using Addressables with Entities?

It doesn't look like it currently, but I can't find any hard confirmations on if they planning to add support, or if you just have to work with both yourself

[rotund token]

there's an "Entities Addressables" being worked on heavily atm

it's separate from the current Addressables package though

[jolly palm]

Makes sense. Alot of the addressables technology follows a separate workflow so you would have to rework alot anyways

[rotund token]

subscenes load using similar techniques from addressables

[jolly palm]

Is there even a good way to dynamically load in entities then?
I guess they have to be setup as separate subscenes and then load those...?

it looks like for large pieces of data, loading them as entities doesnt make much sense currently

[solemn hollow]

IIRC its supposed to be released with official 1.0

[rustic rain]

subscenes are exactly for this

[jolly palm]

if you have multiple subscenes, dont you have different entity managers?

[rustic rain]

no

1 world = 1 Entity Manager

amount of subscenes is unlimited here

[jolly palm]

I'll need to look into subscenes more then

It looks like they can fill a similar role to Addressables (which i guess should have been obvious, since its just dynamically loading data)

[rustic rain]

maybe?
SubScenes are just a way to load/unload entities fast

entities can contain any data at the same moment

[jolly palm]

Ultimately I'm just trying to load weapons as entities at runtime. I don't need all the weapons preloaded into the scene so addressables would have been ideal. For now I'll see if i can make it work well with subscenes

[edgy fulcrum]

@jolly palm the new Baker workflow helps here in making the subscene easier to manage, then just get the GUID of that and load it via your normal Addressable methods, then use the new World loading stuff to move the loaded entities into it

[jolly palm]

As it turns out one of my dependencies don't work with entities yet so the weapons need to be gameobjects anyways. Instead I just have to link the gameobjects with the entity for proper data processing

[solemn hollow]

how do EntityCommandBuffers with multiplayback policy work?
Does calling Playback() clear them?

[rustic rain]

multi can be played back multiple times

once you played it back once you can't add commands to it anymore though

[solemn hollow]

ah ok. i was considering a weird usecase where i would have to create an ECB per entity in a loop. thought multiplayback might help but it wouldnt if i could record only once

[solemn hollow]

can i use the SortJob to sort after Length of LinkedEntityGroup?
I am not familiar with that API

also how do i get a list of DynamicBuffers out of a query?
var linkedEntityGroups = query.ToComponentDataListAsync<LinkedEntityGroup>(Allocator.TempJob, out var listDependency);
this doesnt work for buffers

[rustic rain]

maybe you need <DynamicBuffer<T>>?

for generics to work

[solemn hollow]

no i tried that 😦

[edgy fulcrum]

what's the best way to store a reference to a Mesh per-entity without using SharedComponents or dictionaries on systems? make a new IComponentData that has an unsafe pointer to Mesh and process that? Any new ideas in Entities 1.0 that could help with this?

[rustic rain]

I'd suggest creating a singleton entity with reference to it

which would be your dictionary within World

[edgy fulcrum]

I would really like to "attach" it directly to the entity without going through yet another "manager" entity

[rustic rain]

btw

you can use blob array if your mesh data is unmanaged

or managed components

which will basically just do the boilerplate for you

[edgy fulcrum]

mmm blob array I did see that in action in PhysicsCollider but not sure if it would work for such a managed class like Mesh?

[rustic rain]

only unmanaged

[edgy fulcrum]

I do generate the mesh data via Burst jobs (Mesh.DataArray and stuff) but ultimately I need a Mesh to render with... argh

[rustic rain]

for managed just go with managed icomp

why not use built in graphics solution?

[edgy fulcrum]

for our purposes we just use a simple scatter-gather a NativeList of ents to render, then loop on it with Graphics.RenderMesh()

entities graphics (hybrid renderer) really really doesn't like it when we generate hundreds of meshes per frame 😦

I'll look into managed icomps and see if it fits our workflow this time... thanks!

[rustic rain]

why not modify meshes instead of creating them then?

graphics uses BRG

which requires registration of meshes

[edgy fulcrum]

yeah that's the problem, agreed

[rustic rain]

so as long as you keep same mesh modified, it'll be fine

[edgy fulcrum]

will BRG perform OK with lots of submeshes instead?

[rustic rain]

BRG is meant to perform well with tons of data

it's what it was made for

😅

[edgy fulcrum]

haha yuppie! what I meant was to register only one mesh per "family" of entities, then store the per-entity data in submeshes

will that trigger BRG updates or funky stuff like that?

[rustic rain]

I guess you better read on it's API Instead, I'm not familiar with it

[edgy fulcrum]

Graphics.RenderMesh() already has a submesh index, so I'll definitely look into it!

[rustic rain]

so does unmanaged render data on entity

[safe lintel]

so this is appearing in my assetimporter logs Exception thrown during SubScene import: System.ArgumentException: Junk.Cameras.BillboardSystem+BillboardJob must already be filtered by ComponentSystemBase or ISystem but quite honestly I have no idea what it means and what it has to do with my subscene

[rotund token]

it means you have run into a common bug

and you require to restart unity, clear your cache

and continue on your merry way

over and over 😦

[safe lintel]

yeah been busy with other things and getting back into the swing of things. ive been restarting for the past hour, when does it stop 🥲

sigh, feel like the more I try to fix things, the more obscure errors I get A BatchDrawCommand was submitted with an invalid Batch, Mesh, or Material ID. BatchDrawCommand index: 0 (index in range: 0), BatchDrawRange index: 0 This is not supported when rendering with a BatchRendererGroup (or Entities Graphics). MaterialID (0x7) MeshID (0x4) BatchID (0x2)

[edgy fulcrum]

@safe lintel which version of DOTS are you using? sometimes it's maddening to try and track down what's happening in the innards, agreed!

[safe lintel]

should all be latest packages and b13 editor

maddening is an understatement 🙃

[edgy fulcrum]

I guess the problem is that your subscene import is mangling the data somewhere related to the mesh/material that is attached to the entity for the graphics...

[fast crater]

I don’t have DOTS installed because my game is already very far ahead and I don’t want to start all over again. I tried searching for this and couldn’t find any information on it so I’ll ask here. Is it possible to create SubScenes without DOTS? My game is an Open World game and having a large seamless world is something I am hoping to create

[safe lintel]

no, subscenes are inherent to the entities package within dots @fast crater

[rustic rain]

subscene is just entity data serialized

[fast crater]

oh ok. So there isn’t a similar way to do SubScenes without DOTS?

[rustic rain]

ahem?

just load game object?

[fast crater]

Ok

[rustic rain]

just so you don't get confused:
subscenes is just a way for using addressables + game objects but for entities

it's not actually related to scenes

[rotund token]

they are definitely a good tool for streaming in large worlds though

definitely in their thought process when they were first developed

[rustic rain]

I'd guess same can be achieved for GOs using addressables though, no?

[rotund token]

they just kind of evolved as a more general purpose tool

[rotund token]

it's not ideal

large chunks of gameobjects cause huge stalls

[rustic rain]

well yeah, it's GOs 😅

[rotund token]

you're better off streaming in 1 (or small groups) at a time

we limit it to like 12/frame i think

any more than that and it becomes noticeably problematic on their initialization

you need to pool instead usually

[safe lintel]

ugh really feels like im swimming upstream in terms of trying to instantiate an entity during a baking system and set up the graphics vs just using a hierarchical gameobject and going by baking that. feels like this kind of setup was way easier in the GameobjectConversionSystem days

[rotund token]

what are you having trouble with?

[safe lintel]

everything 😅

but in this case: instantiating a prefab, parenting it to another entity. seems simple enough right? but I click that entity inside the editor during runtime, it unparents and sets itself to the parent's parent, and then visually something in the editor kind of borks itself(for lack of a better term?)

[rotund token]

are you instantiating a prefab during baking?

[safe lintel]

inside a baking system

also a note: I am parenting to an instantiated prefab(weapon model), previously parenting (the muzzleflash) to the weapon root(not instantiated during the system), it worked

im uploading a gif because this result is ridiculous

im still not sure if prefab instantiating inside of a baking system is even meant to work or just works by accident

[rotund token]

Do you have your subscene open

[safe lintel]

yeah subscene was open

[rotund token]

Yeah doing this stuff just doesn't work with live baking

If you close your subscene probably be fine

[safe lintel]

come on gfycat, encode faster

yeah it does seemingly not bork itself with the subscene closed but so much easier finding things with names

do you do any instantiating inside of baking systems?

ah wait no im not instantiating inside the baking system, entity came from the baker, maybe this is tripping up the editor but technically I think I should be fine to change the hierarchy inside of the baking system?

[rotund token]

Only for my saving to create per subscene meta data of each entity so I can restore state

But I never have my subscenes open

So I just avoid all the issues people have

[safe lintel]

well given how this is manifesting itself not sure if its me or unity as it didnt happen previously

btw have you setup any graphics inside of bakers? the rendermesh setup in the docs seems like its applicable to runtime but not baking

[rotund token]

I only bake from the gameobject

I do as little generation as possible

I treat them as conversion as much as possible keeping logic minimal

Pretty sure once project scales up the bake process will become critical to iteration

And I don't want to wait 30 seconds to bake on code changes to enter game

[safe lintel]

yeah i feel like gonna need to take a step back and rely on builtin baking systems for some things i was doing before

sad thing is, was trying to setup some things through code instead of a gameobject hierarchy, not even for other people, just to protect myself from myself(i am so likely to futz around with placement inside the editor and not realise im doing it)

[naive eagle]

In the Asteroids demo, if you change the input for shooting to GetKeyDown and remove the weapon's cooldown, the weapon will sometimes fire multiple times per button press. I can't figure out why. The input gathering system in InputSystem should only add a single ShipCommandData with shoot = 1, yet when SteeringSystem reads the data for the current frame, sometimes the next few frames have shoot = 1. I think it has to do with prediction?

[fast crater]

Ok after doing some search I found a way to do multiple scenes without DOTS. But still, thanks for the help. Who knows? I might use DOTS for a future project and used what I learned from you guys

[viral sonnet]

probably has to do with the input sampling, i had this error in my test project and was hunting for what's going on. i had problems with jumping - the asteroids demo doesn't have a proper one because it assumes it just shoots on keyDown. tbh i thought they would fix this. that's just a bad learning experience. anyway, there are multiple solutions. here's one: https://forum.unity.com/threads/how-to-deal-with-trigger-input-and-lagging-clients.1294587/#post-8200437

this was my fix from 3 years ago ```if (inputBuffer.GetDataAtTick(serverTick, out var input) && input.Tick != serverTick)
{
// new frame, new input
input = default(PlayerCommandData);
}

input.Tick = serverTick;

input.jump |= jump;

inputBuffer.AddCommandData(input);```

the gist as far as i remember it is that inputs are generated during prediction but then are overwritten. so its important to gather all inputs during prediction until the next server tick

that's why i use the or logic and only generate a new struct on new server ticks

[late mural]

trying to switch something from regular arrays to native arrays, but im not quite certain how to construct this as a native array, some tips would be appreciated ```cs
int[][] triTable = {
new int[]{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
new int[]{ 0, 8, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
new int[]{ 0, 1, 9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
//etc
};

[rotund token]

The arrays all seem to be the same size

So best way is to just pack it as a single array

Index = y * width + x

[late mural]

oh, that is clever, just like pointers, only with native arrays instead! Thanks so much!

[rotund token]

There are other ways to hold containers of containers in dots

But if your arrays are all the same length I think just packing into single array is best

[late mural]

got it, thanks so much for the info!

[uncut rover]

if your data is not changing, there is also the option of blob assets

[rotund token]

Actually if your data's not changing you can just use a static readonly int[] array

This is a very common use case for things like tri tables

You could just flatten that array into an int[] coolkat

Same indexing rules but avoids need to manage native memory

And you can still access it direct in burst jobs

[late mural]

wait really, that is cool, and would probably save me time lol, thanks!

[rotund token]

Burst can access static readonly primitive arrays

[late mural]

thanks so much for the info!

[safe lintel]

v2 transform system still not available for physics right?

[safe lintel]

why is the TransformBakingSystem removing and resetting my transform components i added in baking 😢

[rustic rain]

You need to assign appropriate transform options

It's in Baker

[safe lintel]

ahh lifesaver

[full epoch]

Had this problem with shooting bullets(newest physics, entities) where on 1st frame bullets were a kind of stretched and problem gone when i set scale of localToWorld to 0(when instating bullets)(setting other values seems not fixing the issue) but losing that 1st frame and afterwards bullets are scaled ok - hmm idk how this can be fixed some other way

[late mural]

is there anyway to get native arrays to show in the inspector, a bit like how regular arrays show up?

[drowsy pagoda]

Are box casts significantly more expensive than ray casts? Would it be worth it to perform ray casts until there is no hit and then verify that direction with a box cast to ensure the object can avoid obstacle. Or am I just better off sweeping with box casts only?

[rotund token]

box casts are not that expensive

it really depends on your scale of what you're doing

sphere cast is cheaper

[late mural]

i notice when dealing with pointers that you cannot interpret vector4* as float4*, wondering why this is? Are they setup differently in memory?

[drowsy pagoda]

thx

[rotund token]

hmm there should be no issue with that

you can reinterpret pointers to anything, there's no type checking

you'll just break things

but in your case they have the same memory layout so should work fine

[late mural]

how exactly do i reinterpret pointers then incase im doing it wrong lol? (currently im doing it like this: (*whatever_new_type) )

[late mural]

wait nevermind, im an idiot, and i somehow forgot to type one of the asterisks, whoops lol

probably being a bit stupid as per usual, but i cant seem to work out what this error means exactly, it only ever appears if i try to modify a writeonly nativearray<int>, anyone know what this could mean?

aha, from a bit of googling it appears that it is tryna stop me from creating race conditions, and using [NativeDisableParallelForRestriction] i think ive fixed it lol yay

[rotund token]

that feeling when you make Unity produce an error
ExecutionEngineException: An unresolved indirect call lookup failed
that has 0 google results...

i know that generics have limited support in il2cpp, it's just annoying this worked in IL2CPP in Unity 2021 and is now broken in 2022

[safe lintel]

ah zero google results, life of a pioneer 😉

[rotund token]

reported another bug to unity earlier this week

supposedly one they've seen rarely but haven't managed to get a repo for

well i had a 100% repo

😦

[safe lintel]

its kind of odd but like a good chunk of my last reports have gone like they couldnt repro it, ask me for more info(which i try to follow up on but often forget) but usually ends up in failure, it gets closed and then a few weeks later they did repro it and its logged

[rotund token]

i am very good at getting reliable repos

[safe lintel]

i swear I upload decent repros 🙂

[rotund token]

yeah that's annoying

so yeah my il2cpp issue is basically calling a generic interface method

even if i explicitly have an implementation somewhere in project

full generic sharing just doesn't seem to be working for me

in Unity 2022.1, IL2CPP no longer produces an ExecutionEngineException, eliminating a whole class of errors that are difficult to rectify.

ha lies Mr Peterson

ok i've got it working when not using full generic sharing

just need a gross workaround but i can mostly hide it

[late mural]

ok trying to make sure i understand that, so if i have an int[whatever][16] as a 1d array and i want to get to [x][y] of that array, then i do [y * 16 + x], correct?

[rotund token]

it's [y][x]

[late mural]

ah, i see, thanks for the info!

[rotund token]

its a tad confusing but
int[][] arrays;
int[] xArray = array[y];

so if y == 0

then the value is just x

0-15 in your case

[late mural]

im afraid that is a bit beyond me, but hopefully with the new knowledge that i was doing things in reverse, i should now work things out somehow, thanks!

[rotund token]

            i[0] = new int[16];
            i[1] = new int[16];
            i[2] = new int[16];
            i[3] = new int[16];

            var j = new int[4 * 16];

            var a0 = i[0][0];
            var a1 = j[0 * 16 + 0];

            var b0 = i[0][5];
            var b1 = j[0 * 16 + 5];

            var c0 = i[1][0];
            var c1 = i[1 * 16 + 0];```

hopefully that's an ok comparison

[late mural]

ok yes, that makes a lot more sense, thanks a ton!

[uncut rover]

This may help : https://www.noveltech.dev/csharp-flatten-array/

[late mural]

thanks for the info, luckilly ive managed to get something working already though lol

[naive eagle]

Thanks for the link. Comparing to the previous tick indeed solves my issue. I finally figured out why, too: GetDataAtTick returns the latest data older than the tick, not the data at exactly that tick. Since the input gathering isn't tied to the server ticks, it skips some ticks, which means my system reads stale data. Thus, I need to monitor for how the input data has changed instead of what it says exactly.

[late mural]

doing some marching cubes, and trying to optimise the way i workout if a gridpoint is activated or not, currently this is it:

    [BurstCompile]
    public unsafe struct CalcEmptinessJob : IJobParallelFor
    {
        [NativeDisableParallelForRestriction]
        public NativeArray<int> Emptiness;

        [ReadOnly]
        [NativeDisableUnsafePtrRestriction]
        public float4* PosArray;

        [ReadOnly]
        public float3 Pos;

        [ReadOnly]
        public float DistanceToCount;

        public void Execute(int i)
        {
            if (math.distance(new float3(PosArray[i].x, PosArray[i].y, PosArray[i].z), Pos) <= DistanceToCount)
            {
                Emptiness[0]--;
            }
        }
    }
```, currently got the batch size set to 64, which i think is good, wanted to get you clever people's opinions on it though?

[late mural]

ok from further testing, it appers 32 batch size speeds up things quite a bit, still very slow, perhaps this cursed for loop is not the fasted way of checking if something is nearby, especially when the for loop is looping over 30 thousand particles, fascinating!

[covert lagoon]

What?

[covert lagoon]

Ok it works.

[muted star]

Hi everyone, how can I force that all jobs from a world to complete?
I suppose one could create a sync point by spawning an entity but that would be ugly.
Dependency.Complete() wouldn't work, right?

Different question:
How can I check if all jobs of a world were completed?

[uncut rover]

https://docs.unity3d.com/Packages/com.unity.entities@1.0/api/Unity.Entities.EntityManager.CompleteAllTrackedJobs.html#Unity_Entities_EntityManager_CompleteAllTrackedJobs

Does that suit your need

[muted star]

Thanks @uncut rover , I just found it aswell

Haven't found a way to check if all jobs were completed yet

[uncut rover]

You can look at the implementation for the method I linked. It probably contains some internal way to get all tracked job. From that you could check all the job handle.isComplete.
Not on my PC, can't check :/

[muted star]

Good idea, I found in ComponentDependencyManager.cs m_World.ResolveSystemState(m_World.ExecutingSystem)->m_JobHandle.IsCompleted() should do the trick

[frosty siren]

Is it possible to query something like this? Or should I manually write IJobChunk and manually filter with ArchetypeChunk.DidChange(typeHandle0) || ArchetypeChunk.DidChange(typeHandle1)?

state.Entities.
  WithChangeFilter<T0>() OR WithChangeFilter<T1>

[rustic rain]

Entities foreach is not working with ISystem anymore

[frosty siren]

i'm on 0.51

[rustic rain]

you mentioned IJobChunk 😅

yeah, you can just use WithChangeFilter

I think you can list them <T1,T2> like that

[frosty siren]

yes, IJobChunk exists since I don't remember from what version

at least from 0.17

[rustic rain]

in 0.51 you use IJobEntityBatch though

[frosty siren]

it is not the same think i guess

[rustic rain]

it's not

but in 0.51 it was mainstream job type

ForEach gets codegened into IJEB

[frosty siren]

yes, though not all tasks resolved through IJobEntity, sometimes you need more control about what entities you want handle

ohhh, that is what you mean

[rustic rain]

EntityBatch

yeah

[muted star]

Are build config files still supported when using ECS 1.0?

[rustic rain]

no

deprecated

[muted star]

That's unfortunate, did they mention if the scriptable build pipeline will later be supported again?
I couldn't find anything about this topic :/

[safe lintel]

no, they stated its getting canned as they dont have resources to support it separately from the classic build pipeline

im hoping builtin build gets similar features over time, kinda seems like an area ripe for improvement(among many others tbh)

[quiet magnet]

public void Execute(int i)
        {
            if (math.distance(PosArray[i].xyz, Pos) <= DistanceToCount)
            {
                Emptiness[i]--;
            }
        }

For a start. Also not sure why you have Emptiness[0] if intended, if it is 1 variable you can use NativeReference<int> Emptiness. Then set the array boundary with Schedule(PosArray.length, 32)

[coarse turtle]

luckily i think some of the things are pretty accessible with using BuildOptions: https://docs.unity3d.com/ScriptReference/BuildPipeline.BuildPlayer.html

I ended up creating something similar to the build config because I liked how you could slot in shared configs

[safe lintel]

ah hadnt seen that before. will have to try to remember it next time I mess around with my build settings

Generic message code 233 has not been handled anyone ever figure out what this meant? thought I was done with that particular message but I guess I thought wrong

[robust scaffold]

Thats just the unity hub dying. Close the editor and close the hub (right click on the taskbar button then press close) and reopen everything.

[safe lintel]

such a random error message, but that worked

[safe lintel]

hmm so entities journaling is telling me the RenderMeshPostProcessSystem is removing a RenderMeshArray from my entity(and then re adding it) but the system itself doesnt appear to have any remove component lines? also the array definitely doesnt appear on my entity

[pliant pike]

stupid question but when I set the translation of an entity does it then automatically set the translation of all the children entitys?

[robust scaffold]

No. It must also run through ParentToChildTransformSystem (or whatever it's called).

The component itself is just a float3 variable. A system needs to operate on it for anything to be done.

TransformV2 might be different. I think they're trying to do some of that instantaneous component changes with aspects and methods on components.

[pliant pike]

doesn't it do that automatically 😕

It seems like it is working to but its just not putting the sub entities in the correct place

[robust scaffold]

It does but you need to wait until after the system runs for children transforms to be properly changed.

I dont know how hierarchy works in DOTS personally. Everything is largely flattened or manually parented.

[pliant pike]

yeah I think I've just got the problem you have with gameobjects where if you have the gameobject not at the zero position the suboject position is just all over the place

[late mural]

wow never knew about native reference, that should actually improve improve my code in quite a few areas, thanks for all those tips and tricks!!!!!

[quiet magnet]

You're welcome

another think you can do with math.distance, if performance really is an issue, is unwrap it

[late mural]

this loop runs 30 thousand times a physics frame, if not more, any performance gain is going to probably be good lol

[quiet magnet]

when i say unwrap, with any formula, just cut it back to the algorithm

i found distance can be enhanced quite a bit doing this

[late mural]

fascinating, so essentially just check the distance source code, and then just do whatever it is doing?

[quiet magnet]

well im one of those annoying micro-optimisers

but

i just love it haha

    [BurstCompile]
    public static void GetDistance(in float IN, in float3 A, in float3 B, out float OUT)
    {
        OUT = IN + math.sqrt((A.x - B.x) * (A.x - B.x) + (A.y - B.y) * (A.y - B.y) + (A.z - B.z) * (A.z - B.z));
    }

    [BurstCompile]
    public static float GetDistance(in float3 A, in float3 B)
    {
        return math.sqrt((A.x - B.x) * (A.x - B.x) + (A.y - B.y) * (A.y - B.y) + (A.z - B.z) * (A.z - B.z));
    }

[late mural]

woah cool!

[quiet magnet]

you can also unwrap sqrt, but, thats a little more complicated

[late mural]

fascinating, if performance is bogging me down ill try it! Thanks so much for all this info!

[quiet magnet]

im no whizz, but i like messing around with code!

[late mural]

same lol

[quiet magnet]

if you want to get a pure pointer to a native array, use NativeArrayUnsafeUtility.GetUnsafeBufferPointerWithoutChecks( x )

[late mural]

ooh fascinating, thanks for the info!

[quiet magnet]

but as always, take care in pointer world haha

[late mural]

ye lol

[robust scaffold]

I really wish there was a better integration between SRP and DOTS.

There just needs to be a struct based compute buffer API. So I can upload data in a job

[safe lintel]

id love for more struct based job friendly apis

[robust scaffold]

Just a struct. I dont even care if it's burstable or not. I just wanna be able to write to a compute buffer without a bunch of redundant arrays.

[robust scaffold]

https://www.jacksondunstan.com/articles/5478

There's actually quite a bit that are job friendly. A lot of internals though

[quiet magnet]

any idea if delegate* are compatible?

[robust scaffold]

Delegates, as in the C# dynamic functions, are not supported in Burst.

[quiet magnet]

ive been using these for testing, as hardly any latency on calling static methods

well i know delegates won't be, these are delegate*

probably not, but you know, maybe they are!

[robust scaffold]

Delegate pointers? Uh, no clue. We have burst function pointers?

[quiet magnet]

yes not sure they are the same thing, those do use delegate i think

https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/proposals/csharp-9.0/function-pointers

[robust scaffold]

Interesting. Material property block's constant vars can be set from a thread. MPB is a class however so it'll need to be an actual C# thread and not a job.

[rotund token]

Yes you can use delegate pointers in burst

You can just wrap them in functionpointer<t>

Which can potentially point to a burst method but it doesn't have to

I use this for to make data migration easier in my save library

Though I've mandated them to be burst compiled because no reason not to and makes initial reflection quicker

As I can broad phase using burst attribute

Rather than making users use another attribute

[drowsy pagoda]

When using a CastAll, are the results guaranteed to be sorted by hit.Fraction? If not, is there a specific order or is it just random?

[spice vale]

Anyone know if there is a way to get access to a mesh's internal array on the cpu-side? I want to update mesh without copy, essentially. Checking the advanced mesh api, I can only see methods that copy my vertices over.

Or it it impossible because they use managed arrays internally or something?

[muted star]

v2 transform isn't available for physics yet

Does anyone else have problems with physics in ECS 1.0 seemingly jumping ahead in time ever so often, making it look very glitchy?
I modified physics and am updating the world manually, so it might just be my modifications which are messing things up.
In 0.51 this problem isn't present 🤔

[umbral veldt]

Anyone knows a good tutorial to get started with Unity Netcode for Entities? Or is making a multiplayer game with DOTS not yet a viable option?

[balmy thistle]

https://docs.unity3d.com/ScriptReference/Mesh.MeshData.GetVertexData.html

[spice vale]

How did I miss this?! Thanks

[balmy thistle]

Hope it helps

[balmy thistle]

I'd start with looking at the samples linked in the forum post here: https://forum.unity.com/threads/netcode-samples-for-experimental-version-1-0-exp-8.1350743/

[spice vale]

But wait, this cannot be used on existing meshes, right? Since we need a Mesh.Meshdata and that can only be readonly for an existing mesh.

[balmy thistle]

Not sure I follow, but there's an API for writing mesh data if you need it: https://docs.unity3d.com/ScriptReference/Mesh.AllocateWritableMeshData.html

[spice vale]

Yes, but that one creates a new mesh, I want to modify an existing mesh's vertices in place.

[balmy thistle]

Well, can't you apply it to an existing Mesh with ApplyAndDisposeWritableMeshData ?

[spice vale]

I saw in the source code here: https://github.com/Unity-Technologies/UnityCsReference/blob/master/Runtime/Export/Graphics/Mesh.cs that there are public overloads for AllocateWritableMeshData such as public static MeshDataArray AllocateWritableMeshData(Mesh mesh) but they are not showing up for me, nor are they in the documentation. I only have access to public static MeshDataArray AllocateWritableMeshData(int meshCount)that is designed to create new meshes.

[balmy thistle]

Although if your goal is to avoid all temporary allocations, I don't think there's a more direct mechanism

[spice vale]

I can do that, was just looking for a way to avoid having to keep two buffers of my vertex data. One that I modify and one that is in the mesh.

[balmy thistle]

Yeah, I'm not sure direct access is even possible because of where vertex data lives

[spice vale]

Where does it live?

[balmy thistle]

Oh, I'm not an expert, I'm just speculating

[spice vale]

It was my guess also, maybe that they were managed arrays, and as such it would not be possible to give out a persistent pointer.

[balmy thistle]

I was thinking something more along the lines of the real data living in GPU or write combined memory or something where it actually does need to get copied

[spice vale]

But I mean if we can mesh.vertices, surely it must also exist a vertex buffer on the cpu?

[balmy thistle]

Well, as I said I don't want to overrepresent my subject matter expertise, but I imagine you have the original mesh data from the asset load which you keep around after uploading. And if you were to update it, the CPU side copy would also get updated and then either explicitly uploaded or cached on the GPU.

[spice vale]

Mhm, I'm looking at this: https://docs.unity3d.com/ScriptReference/Mesh.UploadMeshData.html So it seems there is not a persistent buffer cpu side, since we can specify that the buffer should disappear with markNoLongerReadable.

[muted star]

Here's what it looks like, it suddenly snaps.
Did anyone else have this problem?

[muted star]

I've never used IJobChunk before, how can I turn this into an IJobChunk?

[BurstCompile]
        private struct UpdateRotationJob : IJobEntityBatch
        {
            public ComponentTypeHandle<Rotation> rotationHandle;

            public float deltaTime;

            public void Execute(ArchetypeChunk batchInChunk, int batchIndex)
            {
                NativeArray<Rotation> rotations = batchInChunk.GetNativeArray(rotationHandle);

                for (int i = 0; i < batchInChunk.Count; ++i)
                {
                    Rotation rotation = rotations[i];

                    // Modification
                    rotations[i] = new Rotation
                    {
                        Value = math.mul(
                            rotation.Value,
                            quaternion.RotateY(math.radians(100 * deltaTime))
                        )
                    };
                }
            }

This is where I'm at with IJobChunk but don't know how to proceed.
I guess that chunk.GetNativeArray is no longer the way to go here, right?

        private struct UpdateRotationJob : IJobChunk
        {
            public ComponentTypeHandle<LocalToWorldTransform> rotationHandle;
            public float deltaTime;
            public NativeArray<int> ChunkBaseEntityIndices;

            public void Execute(
                in ArchetypeChunk chunk,
                int unfilteredChunkIndex,
                bool useEnabledMask,
                in v128 chunkEnabledMask
            )
            {
                var enumerator = new ChunkEntityEnumerator(
                    useEnabledMask,
                    chunkEnabledMask,
                    chunk.Count
                );
                while (enumerator.NextEntityIndex(out int i))
                {
                }```

[safe lintel]

i could be wrong but I think the ChunkEntityEnumerator is mainly for use when you are dealing with components that use the enable disable functionality

ive been upgrading all my old jobs just to use chunk.GetNativeArray for the time being as I havent yet used enableablecomponent in any meaningful way

[muted star]

Would still be interesting to know how this enumerator can be used

cuz the documentation example doesn't make much sense to me

[safe lintel]

theres use inside CreateRigidbodies job inside of PhysicsWorldBuilder.cs

[muted star]

Using SystemAPI methods with generics is not supported within utility methods and aspects 😕
Does anyone know if this will change in the full release of ECS 1.0?

[jolly palm]

I love ECS but it basically has ANTI-synergy with every other system Unity has. ECS hates managed code but all of Unity's common systems (physics, animations, collision, meshes) were built in an object-centric black box that makes it really hard to interact with.

Trying to roll my own animation setup with ECS while I wait is also a nightmare, since I cant access AnimationClip curves as unmanaged data. So I either have to convert and save all my clips into a custom format in the editor that plays nice with ECS, or throw away all the benefits of ECS by using a janky managed entity setup

[robust scaffold]

Either that or roll your own animation rendering pipeline. It's literal pain

[robust scaffold]

I got a method that runs before a ScriptableRenderingPass Execute() that pulls entity data from the client world and uploads them to the GPU for rendering. I really wish there was a direct way to transfer ECS data to GPU side without dipping into mainthread.

[jolly palm]

Is the performance hit of moving data to the GPU that big of a hit on the main thread?
I don't know the ideal way of moving data to the GPU, but i imagine it isnt too big a hit since you are expecting the GPU to do the work anyways

[jolly palm]

Ok i am honestly considering rolling my own animation export pipeline from Blender to Unity since I've already done something similar in the past and I hate the current limitations

On a semi related note, does anyone know the best way to manage 2D collision events in ECS?
It looks like that might be a part of the Unity physics package, but that only appears to have 3D collision support

[rustic rain]

Just use 3d with constraints

Korn flaks did very efficient 2d constraint for physics

[gentle osprey]

Is there a way (or, what is the best way) to work with different systems within different scenes? To motivate why I'm wondering, often when I prototype stuff I create different versions of the prototype so I can easily switch between the different prototypes. There's usually different scenes and different monobehaviours for the different versions of a prototype. However, this doesn't seem to be as easy to do with ECS as with monobehaviours because the systems self register and run irregardless of what scene you're in. Anyone have any ideas?

[rotund token]

for quick prototype or comparing simply adding a RequireForUpdate<Prototype1>() to the systems in the prototype works pretty effectively

also allows you to switch between prototypes at runtime if you wanted to compare

alternatively a systemgroup is an easy way to group a bunch of systems

[ocean portal]

I would either add [DisableAutoCreation] to toggle systems if it's important to have them not run at all, but it's not as fluid as scene switching. You could also bail out early based on a custom data component for example if you want more complex runtime control

[rotund token]

then in your system group you can just do OnUpdate() if (SceneManager.CurrentScene == "MyPrototype) base.Update();
so systems in that group will only update in a particular scene
-edit-

    {
        protected override void OnUpdate()
        {
            if (SceneManager.GetActiveScene().name == "Prototype1Scene")
            {
                base.OnUpdate();
            }
        }
    }```

[ocean portal]

On a side note what did I stumble upon "that’s the problem with irregardless—it has two negations. The ir- prefix means “not,” and if you add it to a word that already means “without regard,” you get “not without regard.” This double negative is what makes irregardless a mess of a word, and an insult to the army of people who are passionate about English vocabulary. Many of them go so far as to assert that irregardless is not a real word."

[rotund token]

if you want a more complex setup i think dreamings library handles this type of stuff

[ocean portal]

Oh well tertle's solutions are way better as expected :D

[late mural]

wondering if there is any current way of getting native arrays to show up in the inspector like regular arrays, or should we just use regular arrays and copy them to native arrays later on?

[ocean portal]

Is there a way to work with SystemHandle's and ecb's? Or a way to get the system's entity?

[rotund token]

the systems entity is intentionally hidden away

you can get it but it takes a tiny bit of work

[ocean portal]

Is that the way to go if I want to set a system's data component with an ecb?

[rotund token]

so yeah does not really work with ecbs by default

[gentle osprey]

Awesome, thanks for the ideas @rotund token & @ocean portal :)

[late mural]

i have an native array of a custom struct that is essentially 8 ints and 1 vector 3, i cant modify any of these ints though for some reason, apparrently they aint variables, is there a workaround?

[solar spire]

https://help.vertx.xyz/programming/common-errors/compiler-errors/cs1612

[late mural]

aha i see, thanks so much!

[solemn hollow]

will there be another release pre official 1.0?

its such a pain to work with the current version...

[balmy thistle]

What problems are you running into?

[solemn hollow]

mainly subscenes not importing correctly. Sometimes it just hangs and i need to restart the editor and other times the entity header file cant be resolved. Then i need to clear the entity cache and restart editor.

Im doing a lot in the baking process right now and thus have to reimport scenes quite often...

[balmy thistle]

Ah, gotcha. Yes that is painful.

[misty wedge]

Does entities 1.0 not show detected leaks for persistent allocations when exiting playmode anymore? iirc it used to at some point

[rotund token]

It should, but it might not taken until domain reload or something

[misty wedge]

even with something like this in update new NativeArray<int>(5, Allocator.TempJob); I don't seem to be generating any leak messages

Leak detection is turned on in preferences, also tried with stacktraces which also doesn't show anything

[rotund token]

What version of unity

[misty wedge]

It seems it only doesn't work for NativeArray, not sure if that's intended or not

What decides the version of NativeArray being used, since it's not part of the Unity.Collections package? Is it part of the engine?

Is leak detection just broken in collections 2.1.0? Even in an empty project I can't get it to detect any leaks with a stacktrace

[pulsar flare]

Yes, leak detection right now is known broken.

[misty wedge]

Ah, good to know.

Is this something new or it never worked after the move away from dispose sentinels?

[pulsar flare]

There is a new system in-place for replacing dispose sentinels, but it is not fully hooked up yet. So it never worked after the move away from dispose sentinels.

[misty wedge]

Alright, thanks for letting me know 👍

Will be interesting to see how many leaks I have after it works again

[queen dome]

Is there a way to disable compound shape creation with Unity Physics (DOTS)?

[solemn hollow]

Can i somehow reinterpret a dynamicbuffer as a System.Collection.Generic.List?

[muted star]

theres probably something like .ToNativeArray() -> .ToList()

[solemn hollow]

var buildSourcesReinterpret = buildSources.Reinterpret<NavMeshBuildSource>().AsNativeArray().ToList();

but seems slow

to LINQ Tolist makes a copy doesnt it?

[muted star]

You don't have to use buildSources.Reinterpret

I think you can just do myDynamicBuffer.ToNativeArray().ToList()

Or even myDynamicBuffer.ToList()

[solemn hollow]

oh the reinterpret is there because the buffer actually just wraps NavMeshBuildSource

[muted star]

Perhaps you could iterate over the dynamicbuffer and fill a list that way to make it more performant

[solemn hollow]

i just thought i can somehow directly treat it like a list without copying anythig

[muted star]

I think as long as you don't add multiple colliders compound shape creation is not a thing

[muted star]

Can't you just access the dynamicbuffer directly like myDynmaicBuffer[0]?

but a dynamicBuffer isn't the same as a list of course.

[solemn hollow]

my goal is to get the data from the dynbuffer into this function
NavMeshBuilder.UpdateNavMeshDataAsync(navMeshData,buildSettings, buildSourcesReinterpret, bounds);

[queen dome]

Yeah but that is the problem. I need a normal collider for collision and a separate one for damage zone. I am going to go around it by decorating the parent (base) entity with the damage component but I will not be able to create two separate damage zones.

[muted star]

I don't know how you could do that. If you could somehow get a pointer to the dynamicbuffer that would be neat.
Otherwise NativeArray or NativeList would be the other option with less overhead than List

[muted star]

Idk, Unity Physics is too complicated for me to wrap my head around the internals.
Perhaps you could use Latios spatial querying system for damage zones but it still uses 0.51. Just an idea, never actually tried it
https://github.com/Dreaming381/Latios-Framework

[misty wedge]

Is it normal that the temp pool climbs over normal usage? If so, what's the reason for it?

It's also growing pretty quickly, this is just a few minutes apart

[balmy thistle]

Does it eventually stabilize?

[misty wedge]

Nope

I just took another capture and the persistent allocator also allocated something, but that also wasn't from me. This is a project using netcode and physics though, so not sure if they periodically need to allocate something using a persistent allocator

All my persistent allocations just happen once on startup, so I'm confused on what the origin is

I'll wait until leak detection works again though, maybe something is actually leaking somewhere

[muted star]

Is this child baker okay?
For some reason the child doesn't follow the position and rotation of the parent :/

public class ParentMono : MonoBehaviour
    {
    }

    public class ParentBaker : Baker<ParentMono>
    {
        public override void Bake(ParentMono authoring)
        {
            var buffer = AddBuffer<Child>();
            foreach (Transform child in authoring.transform)
            {
                buffer.Add(new() {Value = GetEntity(child)});
                AddComponent(GetEntity(child), new Parent {Value = GetEntity(authoring)});
            }
        }
    }```

[pulsar jay]

I am not using 1.0 yet but before that it needed some more components for the children to follow their parents. Fore example a LocalToWorld and LocalToParent component on the child. But afaik the transformation systems have been reworked so I dont know if thats still true

Is there any good way to time ECB actions? I want to sync the destruction of an object with a vfx effect. So a user interaction should trigger the vfx effect and the destruction of an entity half a second later.
Would be nice to have a special kind of ECB that just accepts a delay.

[muted star]

Ah yes, I think I'm missing LocalToParentTransform. Thank you!

(Transform related components are already baked)

[muted star]

I now have these two bakers but it's still not working

 public class ParentBaker : Baker<ParentMono>
    {
        public override void Bake(ParentMono authoring)
        {
            var buffer = AddBuffer<Child>();
            foreach (Transform child in authoring.transform)
            {
                buffer.Add(new() {Value = GetEntity(child)});
            }
        }
    }

public class ChildBaker : Baker<ChildMono>
    {
        public override void Bake(ChildMono authoring)
        {
            var parent = authoring.GetComponentInParent<Transform>();
            AddComponent(new Parent {Value = GetEntity(parent)});
            AddComponent(new LocalToParentTransform());
        }
    }

[proud jackal]

What are you trying to do? The Child buffer from the transform system is automatically updated for you and as a result, you can't update it. You can however change the Parent comp, and the system should update everything for you :3

[muted star]

I would like to bake children.
I deleted the parentbaker now and changed the childbaker to this

public class ChildMono : MonoBehaviour
    {
    }

public class ChildBaker : Baker<ChildMono>
    {
        public override void Bake(ChildMono authoring)
        {
            var parent = authoring.GetComponentInParent<Transform>();
            AddComponent(new Parent {Value = GetEntity(parent)});
        }
    }```

[rustic rain]

what do you want to get in the end out of it?