How to get custom stencil depth value or rendering group id in custom Shader code?

Questions
1

Hello ,

I want to distinguish different objects in custom shader and one useful approach is to set custom stencil value for mesh and get this value in custom shader. I don’t know if babylon has some releative functions or not.

The most similar info I find is the renderingGroupId in RenderingManager, but I donnot how to get this value in custom shader, and not sure renderingGroupId is really useful for my purpose.

Thanks first.

2

You can not read this from a shader, the only things you would have access to are textures.

So either you rely on shaders to prevent rendering for instance if it already has a certain value or you need to render to texture to fetch the info from your shader.

3

Sorry, I’m not understand about the certain value. Could you please provide a PG about how to get some info about instance in the custom shader ?

4

You need a render target and a custom shader where you would render one different color per group. then on your main rendering you could read from this texture to know which object it is.

5

Get it, thanks!