hdrp gpu instance MPB不生效问题

Thanks for posting these tips. I was devastated when my project dropped to 3 FPS because material properties don't work out of the box. I was able to edit the generated shader to go from 5000 draw calls to ~15. Here are some relevant snippets. I am only changing the color of my game objects in this example

Find all of these blocks of code (there are several copies)

Code (CSharp):

1. CBUFFER_START(UnityPerMaterial)
2. float4 _BaseColor;
3. CBUFFER_END

Replace them with this

Code (CSharp):

1. CBUFFER_START(UnityPerMaterial)
2. UNITY_INSTANCING_BUFFER_START(Props)
3. UNITY_DEFINE_INSTANCED_PROP(float4, _BaseColor)
4. UNITY_INSTANCING_BUFFER_END(Props)
5. CBUFFER_END

Then find every instance of _BaseColor in the shader functions (there are several copies)

Code (CSharp):

1.  SurfaceDescription SurfaceDescriptionFunction(SurfaceDescriptionInputs IN) {
2.         SurfaceDescription surface = (SurfaceDescription)0;
3.         float4 _Property_A850853A_Out_0 = _BaseColor;
4.         ....

Replace them with UNITY_ACCESS_INSTANCED_PROP(Props, _BaseColor)

Code (CSharp):

1. SurfaceDescription SurfaceDescriptionFunction(SurfaceDescriptionInputs IN) {
2.         SurfaceDescription surface = (SurfaceDescription)0;
3.         float4 _Property_A850853A_Out_0 = UNITY_ACCESS_INSTANCED_PROP(Props, _BaseColor);
4.         ...

And lastly don't forget to set the material properties on your game object

Code (CSharp):

1. int colorPropId = Shader.PropertyToID("_BaseColor");
2. var matProps = new MaterialPropertyBlock();
3. matProps.SetColor(colorPropId, color);
4. renderer.SetPropertyBlock(matProps);