#enfusion_physics

It seems wheels are only raycast wheels, any hope we could get some volumetric wheel colliders?
https://i.imgur.com/LcJ60rM.png
https://i.imgur.com/mA88WBE.png

Wheels are represented by raycast, yes. As for volumetric wheel colliders, I already have one working prototype but there are things that need to be solved first before introducing such feature.

<@&105623147411202048> Can we have threads here, please?

Sounds cool, I also would love to see volumetric wheels. The 1 flaw of the vehicle simulation currently (and it really is like the only flaw) is that torque is not directed downwards when you're crawling over obstacles because the wheels are just a raycast. Maybe colliders would help with that.
Also +1 to having threads here

shouldn't the raycast wheel be colliding with that object if it has collision?

there is only 1 ray cast from center of wheel downwards, which leads to unsatisfying and weird effects when colliding with small geometry. For terrain (rolling landscapes) its sufficient, but not for detailed interaction with other collision geometry. If the wheel touches with another part than the bottom most point, it just phases through until center is directly above it, and then the wheel pops up immediately

heres a description how physx handles it
https://docs.nvidia.com/gameworks/content/gameworkslibrary/physx/guide/Manual/Vehicles.html#wheel-contact-beyond-raycasts

This is how the raycast looks

So if it is only projecting a single ray downwards you will never be able to roll over things smoothly where the front of the tire could engage before the bottom (more raycasts or volumetric colliders allow you to climb over steeper objects and react better to small geometry)

https://preview.redd.it/d8qhgwyih2n21.gif?format=mp4&s=f702eca48062075a6040801918e2a518a359781a

This is a circle wheel collider ^^

I want this object to fall down if a car hits it. What should i do ?

per chance is the raycasting locked to one or is it possible to have say, two additional rays located a bit further out?

No way to modify any of that, its all in the engine source

why would they choose a inferior system?

Probably time constraints

I'm sure eventually they will make it more advanced.

what happens when you hit it right now?

it just disappears

huh, that's interesting

it has a collider and all right?

I don't understand why would it disappear 😦

is your entity set to static?

i mean in the entity not in the rigidbody parameters

where is it

flags

havent experienced this yet so not sure what's going on there 😦 sorry

if it's setup exactly the same like other props you can push around then it might be some bug :S

do you know any prop that falls down when you hit it

I remember the small military tents move around when I crash into them with a vehicle

{01AE5FD77A9A4C21}Prefabs/Structures/Military/Camps/TentSmallUS_01/TentSmallUS_01.et

this one

for example

so maybe try copying settings from it

also wooden crate should react quite nicely to vehicles

It worked!

I did the exact things and it worked.

What I just need was the "SCR_DestructionMultiphaseComponent"

Thanks man.

Is there anyway to decrease how forceful the physics engine resolves collisions? I've tried playing with the restitution value in my physics material with no luck, I actually haven't noticed a single difference between 0 and 1. (0 should be perfectly inelastic and 1 being perfectly elastic) Trying to create trains that behave realistically in how they realign the wheels to make a corner. It behaves as expected but with some caveats where it starts jumping vertically for what I assume is a collision resolution. https://www.youtube.com/watch?v=LIbnxpwQhps

I tried playing with my project physics iterations which helped only a very small amount, I maxed it out to 60 iterations in the video above. I've also tried a combination of 60 iterations and 240 ticks, no luck.

I've also tried playing with the different response indexes for different types of momentum but that hasn't helped either

are you really trying to make trains work in that fashion? or just meshing around ?

started out as messing around, if I can resolve the jumping then I'd like to make something more fleshed out using this method

I could always script a method to fake it, but it'd be pretty awesome to have it work true to life 😛

I've also tried a method with geometry blocks attached to a vehicle and have a similar issue with the collisions being wayy too strong and causing the car to just jerk back and forth and lose a ton of momentum. (disabled lateral friction as well so it wasn't a tire issue)

well to be honest I dont think you are ever gonna get a train to work using this method, I remember in gmod you can make trains like this but it was also rough to say the least. the guy who made the arma 3 mod for fast roping ,towing and what not made one for trains maybe you should ask him how its done.

I've done it in arma 3 🙂 It definitely works, but only if you can tune the physics to allow it

I will look into scripted options though, not the end of the world to do it that way

I would only make the train react to physics of the track when it derails, otherwise just follow a spline

There is so much that can go wrong, I don't even know where to start.

The restitution: you can check if it works simply by just letting go a sphere on the ground from sufficient height and see how it bounces of with various settings. There is one unfortunate detail: if you change properties of physics material, you have to restart workbench for changes to take effect.

Jumping on the rails can be also caused simply by its geometry. How is it represented? Are all normal vectors correctly smoothed across the surface? The same applies to the "wheels" as well.

Also how far are you from world origin?

Nevertheless it is interesting test-case for physics engine 👍 Will thing about it when testing features.

Ah I wasn't aware of needing to restart the workbench, that could explain why I didn't see any changes with restitution.

Normal vectors for each face are pointing radially outward from their respective face in this case, it is a cylinder with one end scaled down so normal vector will actually be pointing a bit outwards as well. I've also tried an "L" shape where the normal vector of the rail and train are directly opposite each other with no significant change in jumpiness.

I am near world origin, within 500m.

have you tried to make the cylinder more smooth in terms of vertex count, like to increase its "roundness". Other thing to try is making round corners on the rails just to help smooth out the collision handling.

I agree with others that this is far from ideal case of how to simulate train but from physics point of view there shouldn't be anything to prevent you to do such thing.

I have, rounded corners were more unstable in terms of lateral jerkiness

Vertex count hasn't helped either since the cylinder isn't actually rotating. The same face is always in contact with the rail

I agree as well, this is definitely not the ideal way to do it. But definitely should be doable, and more of a I want to do it sort of thing

Vertex count hasn't helped either since the cylinder isn't actually rotating.
And how are the wheels moving in the video then?

frictionless surface with force added to CG in local forward direction (+z)

The "wheels" aren't wheels at all. They are just there to guide the body back to the center of the track

They could be wedge shaped and do the same thing

ok that's weird, the guides should be rolling:
https://www.youtube.com/watch?v=vkzgcJGdUnA

have you tried it instead trying to force them to slide?

In this case rolling vs not rolling means nothing. In the real world rolling is what provides the ability to accelerate the entire body. In video game we can apply any fictitious force we want to achieve acceleration of the body. I will try it though.

If anything rolling may add even more vertical jumpiness, at least my intuition says so

Wow interesting, I stand corrected.

Rolling cylinder does WAY better with very little jumpiness. Changed my script to apply a torque instead as well

@high sparrow https://youtu.be/eKoMXcLJxb4

The winXP theme caught me off guard

omg I absolutely love it, recently tried to switch my pc to win xp sounds

why do vehicles go uphill faster in reverse?

reverse gear have quite often higher ratios than first gear

and on the other hand moving uphill forward seems to be much slower than it should

https://letting.ru/en/struzhka-v-korobke-peredach-uaz-buhanka-prichiny-vse-chto-neobhodimo/ UAZ-469 and UAZ-452 family has the following gear ratios: 1st gear - 4.124, II gear - 2.641, III gear - 1.58, IV gear - 1.00, reverse - 5.224.

higher gear ratio helps with going uphil

I just noticed that it may not be the car but not being able to go full throttle when driving it, because if I script it to go at max throttle it climbs nicely

but when I drive it I never get high RPMs in the lower gears, and eventually stall if it's very very steep

nvm all that, now it works fine, it seems it was all in my head, just stalled once because of a gear change, sorry

Hey, does anyone know a solution to prevent vdm?

vdm?

running over players with vehicles

just don’t run them over

facts

What if you put a big ball between instead of on the rails? Or two balls connected with an axle?

Is there some way to get the vehicle clutch to function like a real clutch instead of a game clutch? i.e. when the car is in gear and the engine ticking over the vehicle would forward without control input.

can we bind collision events to scripts? run a script on collision?

Mabye IEntity::EOnTouch?

IEntity::EOnContact, don't forget to enable the event in entity/component mask for your entity/component where you want to override this method 🙂

What causes an object to fall through terrain? I've tried a ton of layer masks and presets without success. I can walk into the object and collide with it if I remove gravity, but if it has gravity it falls through the terrain

update: seems it doesnt like my triangle mesh for a collider. switched to a box collider and it worked

any clue how can I cancel a running trace move?

There is none that I can see. What are you hoping to solve by having this?

no reason to continue running the trace if it hits something I want

are explosion area effects just raycasts against firegeometry?

not sure I will take a look, many games I know use physics spheres to simulate explosions in games, but my guess is that bi have used the raycasts because it would be more realistic to real world explosions with shrapnel

Why do the "Destroy Spawn Objects" (from SCR_DestructionMultiPhaseComponent) not spawn in MP on a dynamic rigidbody entity?
Did not find id = 0x40000029 item = @"ENTITY:25" ('Tree','Assets/Vegetation/Tree/Pinus_Sylvestris/Dst/t_pinus_sylvestris_2f_dst_base.xob') at <95.311005 0.980000 137.380005> in Spatial Map at < 0; 0>

perhaps relevant https://feedback.bistudio.com/T165765

Yeah looks like the same bug

Hey there,

Is anyone aware of a method of locking/freezing an axis of a rigid body? Basically I want to force a rigidbody to always be upright

Why is my custom model not colliding with the terrain? Same layer as eg. a bottle (PropFireView) but only my model is falling through the ground 😦

does it have this?

yes, I even copied the bottle and just changed the mesh

What type of collider did you create for it? I've had issues with triangle mesh colliders not working sometimes for terrain collision, usually switching to a convex collider fixes my issues

Yeah, try something else like convex

In blender there is a button to automatically make a shape convex as well

Oh wow UCX just worked, thank you! 😄

Time to write a bug report 😆

I'm not sure if its a bug. I believe somewhere on the wiki it might say why, or it is a bug and I am wrong. I forgot 😦

🙃

Well now I know xD

check Physics::SetLinearFactor

Thanks!!

how do I make a shell bounce duckcry

Thats honestly a great question, did you end up figuring it out?

I'm surprised theres no bounciness or restitution style parameters for rigidbodies

There are in the physics materials; butttt I haven't gotten it to work

no - the shell move component projectile disappears when it hits something, even with collision triggers removed, and regardless of what I put in deflection settings

projectiles currently support bouncing only from specific objects like terrain. Other than that it is not possible atm. It's partially missing feature and partially a bug.

ok, I'll just be patient for now, then, thanks

are some kind of rope physics planned for the future?

in the near future, no

fair

It works fine to me. E.g. I put down a sphere collider with 0.5 friction and 0.88 restitution (coefficients from studies of footballs), and I have a functioning football, can dribble it around a bit or throw it and it behaves in a remarkably realistic manner. Maybe you made the same mistake as me at first; the MPTest terrain is made of sand which has 0.05 restitution so things don't bounce on it. Also you must restart Workbench after changing physmat properties to see changes.

Ahhh, that must have been it. Definitely didn't check the MPTest terrain material

Damn I hate the way Enfusion handles ragdolls.

is there an explosion effect / damage type combo that can move vehicles but not move characters as much?

can a projectile produce the same effect that ramming something with a truck would?

physics wise

Good question also I think bullets are not manipulatable any more(were in arma 3)

With scripting you should be able to get the transform, just like ragdolls do, they push the body based on impact transform, but I think you may have to manually do this

afaik this is done in the C++ side

What about the OnDamage events for HitZones?
Isn't that a way to get hit position for vehicle?

Yes you can get the impact positions and normals like this via OnDamage. But not sure how you would go from there scripted

is anyone working on a Multi Raycast Wheel collider system ? the Single Raycast we have rn is so bad.

Could you elaborate? I would like to know more

how do I make EOnContact fire when colliding with things like buildings?

hope its just layer presets

... even though the thing does collide

just doesn't fire the event

is there a layer preset that collides with buildings + terrain + entities and allows me to have user actions?

its a grenade, and there is a layerpreset in the grenade move component

but... it doesnt fire my EOnContact

Do you mean like when a grenade hits a wall or the ground and makes a sound like *clink clank*

Do you have the event mask set for the entity u want the EOnContact to fire on?

SetEventMask(EntityEvent.CONTACT);

is dayz fully enfusion now?

no and wrong channel

Hello everyone, I just created an object (sewer) but while doing my test the navmesh does not want to enter my sewer (photo). compared to a vanilla house

you have navmesh generation controls

so you can tweak how close/far to/from walls it goes

also this is physics channel

I think for your sewer you can regenerate only relevant tiles with different settings?

walkable raidus work

can I mash multiple rigidbodies together with joints to make a horrible rope physics thing?

Mabybe with 6DOFSpring. If you read this implementation it's basically a chain of spring joints: http://nehe.gamedev.net/tutorial/rope_physics/17006/ . Alternatively maybe the engine exposes enough to implement in Enforce as described on that page.

yes, like Steve-E said, you can use the Physics6DOFSpringJoint for it but I'm warning you, the stability and performance will be far from ideal.

I think I tried it once but it became gmod physics pretty quickly so will try it again sometime in the future

Hi, I know ARMA 3, and one aspect that is definitely problematic when using tanks is the immovable stone fences; in real life boulders are dangerous at high speed, however stone fences can be destroyed by a MBT, and is not believable it will full stop it from 70km/h. is there any plan to improve this?

I don't know how Arma Reforger would handle tanks as there aren't any

ah ty, good to know

but what I do know is that if your vehicle is heavy enough you can drive through some walls, including buildings

it's a great feeling when an enemy squad is defending a building and you just drive the back of your truck into it through the wall and attack them

any plan to add MBT in reforger?

didn't see any tracked vehicles in the roadmap

unfortunately the worst thing about 0.9.7 is you can't stack BTRs anymore

rip btr stacking

The only working tank is a sherman m4 and consideringing humvees dont, tanks shouldn't either

bummer xD

Do they actually float now? i know they used to but they've seemed to decide to stop actually working

the blackhawk mod broke their amphibious features, so they dont float if the mod is enabled

I seee, That makes sense actually. I hope it gets fixed it was a fun little thing to have in the arsenal when Gm'ing. Thank you bacon

is that still the case?

Can I use enfusion engine to create fixed wings?

In that you have a rigid body upon which you can apply forces and build a vehicle controller upon, yes. In that the engine helps you by simulating anything; no.

how do I stop my vehicle from slowing down rapidly when turning?

Turn less

@fleet zenith I've seen you got lost from kiddy land #reforger_xbox

That’s how physics work though

Maybe it has something to do with the differential ?

"Locked differentials will ensure both wheels on an axle always rotate at the same speed. This provides great grip but is not ideal for turns, where wheels are meant to rotate at different speeds."

Taken from the car creation guide

perhaps that was it thanks

also, how do I apply physics force to ragdolls?

I think CharacterAnimationComponent::AddRagdollEffectorDamage should do it.

Dope. Also can I bounce them like a pinball machine using rigidbodies?

Are we able to revert back a character from ragdoll again? To achieve a temporary tazer effect?

I know you can set ragdoll to inactive but honestly haven't tried

Yes you can now, you can test it by enabling in debug menu (Character -> Enable ragdoll debug), and then use melee attack to toggle between ragdoll or not

There seems to be something happening to the ragdoll where after some time not moving it becomes inactive, is there a way to selectively extend or disable this timer?

In CharacterAnimationComponent you should have a property Ragdoll Disable Timer

Perfect, thanks

What would the script command be to disable ragdoll?

CharacterControllerComponent::SetUnconscious(false/true), should only be called on the owner though

There is no way to just activate the ragdoll, you need to go through unconscious state

owner and not authority?

I was able to activate ragdoll by creating it against a character entity and setting it to active

Though maybe I created a new one but it sure did work

Yes of course you can create your own ragdoll by using PhysicsRagdoll::CreateRagdoll but you will need to do the work yourself, I mean, matching bones position, synchronisation ect ect. But if you use CreateRagdoll function, you should be able to do it on any entity and not only characters

Yes owner for now ..

is ragdoll, grenade, vehicle the only thing with synchronized physics in multiplayer? as opposed to things like props