Question ByteAdressBuffer unity_MeshIndexBuffer_RT not set in SRP rendering.

Context: I'm trying to get vertex attribute data from a raycasting shader in a custom SRP (tried in 2019.3.15, 2019.4.4 and 2020.1.0b11).

I've looked into HDRP library and I thought found what I was searching for with UnityRayTracingMeshUtils.cginc (found in CGIncludes), except that I get this error :

Ray Tracing Shader "ProbeTrace": Buffer "unity_MeshIndexBuffer_RT" is not set. Dispatching ray generation shader "RayGen" failed!

(

unity_MeshIndexBuffer_RT

is a

ByteAddressBuffer

in UnityRayTracingMeshUtils.cginc)

I searched on the HDRP package where I could have missed something but did not find anything that could match so I should have missed something in my command buffer setup ?

My setup is as follow :

Code (CSharp):

1.  // Textures Setup
2. ...
3.  
4. // RayTracing Params setup
5. CMD.SetRayTracingShaderPass(rtShader, "RayTracing");
6. CMD.SetRayTracingAccelerationStructure(rtShader, s_AccelerationStructureId,  context.RTAccelerationStructure);
7. CMD.SetRayTracingTextureParam(rtShader, "outputRW", outputTarget.Identifier());
8.  
9. // Execution
10. CMD.DispatchRays(rtShader, "RayGen", (uint)raysSize.x, (uint)raysSize.y, 32);
11. context.ExecuteCommandBuffer(CMD);
12.  

Anyone encountered a similar issue, or with knowledge of what I did wrong ?

 

Same issue here. When trying to fetch data from vertices

Unity version
2020.1.1f1
2020.1.3f1