Question Custom Pass objects to texture

Hey,
I'm trying to render some objects to a render texture using custom pass and layer mask. I can't seem to get it working.

my texture is completely blank. In the frame debugger I can see the correct objects being rendered, but they are flickering.

any ideas why?

here's my code:

Code (CSharp):

1. using UnityEngine;
2. using UnityEngine.Rendering.HighDefinition;
3. using UnityEngine.Rendering;
4. using UnityEngine.Experimental.Rendering;
5.  
6. class MyCustomPass : CustomPass
7. {
8.     public LayerMask maskLayer;
9.     public Renderer renderer;
10.  
11.     private RTHandle _rt;
12.     private RTHandle _rtDepth;
13.     private ShaderTagId[] _shaderTags;
14.  
15.  
16.     protected override void Setup(ScriptableRenderContext renderContext, CommandBuffer cmd)
17.     {
18.         _shaderTags = new ShaderTagId[6]
19.         {
20.             new ShaderTagId("Forward"),
21.             new ShaderTagId("ForwardOnly"),
22.             new ShaderTagId("SRPDefaultUnlit"),
23.             new ShaderTagId("FirstPass"),
24.             new ShaderTagId("DepthOnly"),
25.             new ShaderTagId("DepthForwardOnly"),
26.         };
27.     }
28.  
29.     protected override void Execute(ScriptableRenderContext renderContext, CommandBuffer cmd, HDCamera camera, CullingResults cullingResult)
30.     {
31.  
32.         AllocateBuffers();
33.  
34.         // Render the objects in the layer blur mask into a mask buffer with their materials so we keep the alpha-clip and transparency if there is any.
35.         var result = new RendererListDesc(_shaderTags, cullingResult, camera.camera)
36.         {
37.             rendererConfiguration = PerObjectData.None,
38.             renderQueueRange = RenderQueueRange.all,
39.             sortingCriteria = SortingCriteria.BackToFront,
40.             excludeObjectMotionVectors = false,
41.             layerMask = maskLayer,
42.         };
43.  
44.         CoreUtils.SetRenderTarget(cmd, _rt, _rtDepth, ClearFlag.Color);
45.         HDUtils.DrawRendererList(renderContext, cmd, RendererList.Create(result));
46.  
47.         if (renderer != null)
48.         {
49.             var block = new MaterialPropertyBlock();
50.             block.SetTexture("_MainTex", _rt);
51.  
52.             renderer.SetPropertyBlock(block);
53.         }
54.     }
55.  
56.     protected override void Cleanup()
57.     {
58.         // Cleanup code
59.         _rt?.Release();
60.         _rtDepth?.Release();
61.     }
62.  
63.     private void AllocateBuffers()
64.     {
65.         if (_rt == null)
66.         {
67.             _rt = RTHandles.Alloc(
68.                 Vector2.one, TextureXR.slices, dimension: TextureXR.dimension,
69.                 filterMode:FilterMode.Bilinear,
70.                 colorFormat: GraphicsFormat.B10G11R11_UFloatPack32,
71.                 useDynamicScale: true, name: "Color Copy"
72.             );
73.         }
74.  
75.         if (_rtDepth == null)
76.         {
77.             _rtDepth = RTHandles.Alloc(
78.                 Vector2.one, TextureXR.slices, dimension: TextureXR.dimension,
79.                 colorFormat: GraphicsFormat.R16_UInt, useDynamicScale: true, isShadowMap: true,
80.                 name: "Blur Depth Mask", depthBufferBits: DepthBits.Depth16
81.             );
82.         }
83.     }
84. }