RenderTexture self reference.

Unity Engine
1

Hi. Can each Shader pass read the previous one back as a sampler2D reference to itself?
I’ve tried it but it’s either not available or I’ve done something wrong.

Thank-you.
David.

2

As an example, I can’t do the following for some reason:-

Graphics.Blit(null, destTex, normalMaterial, 0);
Graphics.Blit(destTex, destTex, normalMaterial, 1);

I have to use two textures in the source and destination, even though it’s already been written to in the first pass?

3

Reading and writing to the same texture isn’t allowed. That’s not a Unity thing, that’s a general graphics thing.

Well, technically it is with DX11 & DX12 under very specific situations using the DX11 RWTextures, but Unity’s doesn’t really support them and they have significant limitations and often come with a performance penalty.

4

OK, that makes sense now, thanks loads - I was being daft. :sweat_smile: