OnPostprocessBuild

[warm cedar]

Can i use OnPostprocessBuild to process subscenes before building game?

I want to create my version of "Static Batching" for ecs

I really need it for modular buildings but i also want to use 500x500 subscenes on editor for authoring and convert it to 80x80 subscenes on build for better streaming

[terse kayak]

you could look into SceneSection to maybe achieve this much easier? have your scene be 500x500 and each section be 80x80. i havent played around with sections yet but i bet you find some usecases in megacity

[warm cedar]

This looks really cool. I will look at it yeah thank you

[summer scaffold]

megacity mostly uses for them for lod loading from memory

but yeah sections are still good for this

they actually generate an AABB as well

however this isn't generated from memory when subscene is open

[warm cedar]

Is there any example for it?

I don`t even need while it is open. This looks really promising

[terse kayak]

just earlier i created a thread where i use a bakingsystem to add a scenesection to an entity : https://discord.com/channels/489222168727519232/1093414039469690950

you could just hash the x,y coordinates of your section and put it into the section value for example

[summer scaffold]

i'd just create gameobject sections

add the scene section component

and let the level designers break it up themselves however they want

each section will have a SceneSectionData

[warm cedar]

This is really good way of doing. I will use meters because my game is topdown

[summer scaffold]

which will have a BoundingVolume

generated from the meshes in the subscene

[warm cedar]

Is it auto updated?

the bounding box

[summer scaffold]

anytime you bake it's calculated

[warm cedar]

With this i can stream really big worlds

How do you stream it? at runtime

[summer scaffold]

    public struct SceneSectionData : IComponentData
    {
        /// <summary>
        /// Represents the unique GUID to identify the scene where the section is.
        /// </summary>
        public Hash128          SceneGUID;
        /// <summary>
        /// Represents the scene section index inside the scene.
        /// </summary>
        public int              SubSectionIndex;
        /// <summary>
        /// Represents the file size for the compressed section.
        /// </summary>
        public int              FileSize;
        /// <summary>
        /// Represents the number of Unity Objects referenced in the section.
        /// </summary>
        public int              ObjectReferenceCount;
        /// <summary>
        /// Represents the scene section bounding volume.
        /// </summary>
        public MinMaxAABB       BoundingVolume;
        internal Codec          Codec;
        internal int            DecompressedFileSize;
        internal RuntimeBlobHeaderRef BlobHeader;
    }```

`        public MinMaxAABB       BoundingVolume;`

i just load/unload subscenes

as the character comes in range

unload distance being a bit larger than load

to stop flickering etc

[warm cedar]

I see

Loading the subscene will load all sections?

only 0 right?

It is here: https://docs.unity3d.com/Packages/com.unity.entities@1.0/manual/streaming-scene-sections.html

[warm cedar]

It is really strange, i have a scene with a lot of sections but this is empty

this subscene has a lot sections. More than 400

It is not showing here too

Maybe the problem is i`m assigning sections on a baking system?

Maybe this is the problem

it is the problem but idk how to fix yet. Do i need to always use small subscenes?

[warm cedar]

I got streaming working except for physics colliders. Somehow they go to wrong scene section.

                     .Query<LocalToWorld>()
                     .WithNone<CullingGroupComponent>()
                     .WithEntityAccess()
                     .WithOptions(EntityQueryOptions.Default))
        {
            var section = state.EntityManager.GetSharedComponent<SceneSection>(entity);

            if (StreamableScenes.Contains(section.SceneGUID))
            {
                int sectionIndex = MathUtils.szudzikPair((int)(math.round(ltw.Position.x / 80.0f)), (int)(math.round(ltw.Position.z / 80.0f)));

                if (sectionIndex <= 0)
                {
                    sectionIndex = sectionIndex - 1;
                }

                if (sectionIndex == 57)
                {
                
                }```

This is an example code of my baking system but it adds the renderer on section 3 and the physics colliders on section 57

    public static int szudzikPair(int x, int y)
    {
        int xx = x >= 0 ? x * 2 : x * -2 - 1;
        int yy = y >= 0 ? y * 2 : y * -2 - 1;

        return (xx >= yy) ? (xx * xx + xx + yy) : (yy * yy + xx);
    }

this is somehow on section 57

Can i filter it idk? move it to section 0 or something like this?

Or run this baking system before physics?