Render Texture Nightmare

[placid cairn]

Hello guys, I'm starting to get really annoyed by one Entities Graphics problem... The Render Texture, if provided by a Camera, need to be reassigned at runtime (the documentation says so).

I tried a few things from using a gameobject for updating the materials (didn't work) to trying to update from MeshArray and MeshMaterialInfo... But because the material was baked, I can't even access it...

So I guess the one thing left to do is to replace the Mesh Renderer baker with some custom stuff? Oh wait the material would still be baked.....

How do you do this .... thing ?
Please

Btw I also have the problem when I instanciate a gameobject in the system from a UnityObjectRef. Not sure if it's the same problem, that's weird.

[placid cairn]

Up (because I don't see the thread anymore in my interface)

[modern verge]

Tbh reading this I really have no idea what your problem is
No idea how camera rendertexture and entities are related here

[placid cairn]

I'm speaking about this :

RenderTexture
If there a camera renders into a RenderTexture and this RenderTexture is assigned on a material on a MeshRenderer object inside the subscene, the RenderTexture will be incorrect in player. To workaround this, re-assign the RenderTexture to the entity material in runtime.

https://docs.unity3d.com/Packages/com.unity.entities.graphics@1.4/manual/known-issues.html

[sturdy igloo]

I think the actual problem here is that RenderTexture asset you bake via Subscene and the one you load via Scene are actually different InstanceIds

Which is true for all assets btw, not just RenderTexture

[placid cairn]

Make sense, but I don't know how to access a baked material because it's index is < 0. Is it simply impossible ?

[sturdy igloo]

You need two components: RenderMeshArray and MaterialMeshIndex. Use utility methods on those types to get correct Material you want

both are present on baked renderer entities

[placid cairn]

Yeah but on baked entities, the index in MaterialMeshIndex is < 0 and so I can't access anything to RenderMeshArray, or did I forgot something important ?

[sturdy igloo]

yes, they have custom index system and you need to rely on methods which convert them to real array indices

don't remember exact API, so just use intellisense to figure which are those

it's on one of those types

[placid cairn]

I guess there is somewhere in the rendering system : the conversion or at least how it access the materials, I'll check

[jade jasper]

https://github.com/Unity-Technologies/EntityComponentSystemSamples/tree/master/GraphicsSamples samples are very useful if you havent used them

[placid cairn]

What do you mean ? Did I miss a sample of this ?

Do you know why I can access the system due to protection level ? I have a plugin who access it, but I don't see how.
I don't see any internal somewhere.

        `var registerMeshAndMaterialSystem = state.World.GetExistingSystemManaged<Unity.Rendering.RegisterMaterialsAndMeshesSystem>();`

[jade jasper]

if you have the entity with a materialmeshinfo you have both an index to the material (and the mesh), and you can use that to reassign your rendertexture after getting it from a rendermesharray. the examples dont have an exact replica of this but there should be basic examples of accessing both materialmeshinfo and rma

[placid cairn]

Oh you didn't read the messages, that's okay.
We do know that, but baked entities have a negative index.
The example is about a custom authoring where you register some materials.

But if someone know how to override the default RenderMesh baking, it could be a workaround btw

[jade jasper]

hm did they retroactively make RegisterMaterialsAndMeshesSystem internal? if you use the asmref trick you can access it

[placid cairn]

Still it's frustrating when you see this par in the graphic System :

 BatchMaterialID materialID = materialMeshInfo.IsRuntimeMaterial
     ? materialMeshInfo.MaterialID
     : brgRenderMeshArray.GetMaterialID(materialMeshInfo);

[modern verge]

why do you need access? i think internal systems should be banned because you can't order against them, but you register through EntitiesGraphicsSystem

[jade jasper]

just responding to Do you know why I can access the system due to protection level ? I have a plugin who access it, but I don't see how.

[placid cairn]

I don't see an internal on the struct, but I'm no expert about what you can do with C# so maybe. They use an internal struct so it could be some chain effect. But I'm wondering what the animation plugin did then.

[modern verge]

Internal is default access modifier
if you don't assign one it becomes internal

[placid cairn]

I'm curious about the tirck though ^^

[placid cairn]

AH, then it is T.T

[modern verge]

https://gitlab.com/tertle/com.bovinelabs.core/-/tree/master/BovineLabs.Core/Internal/Entities.Graphics example here

you basically inject AssemblyInfo with [assembly: InternalsVisibleTo("BovineLabs.Core")] into another assembly definition

[placid cairn]

ahh that's what the animation plugin did too

well I guess I'll go this way. A workaround for a know issue... that won't really surprise me if it's the best way to do it