How to set the render target(s) for projector shaders?

Questions & Answers
1

I would like to set SV_Target0 and SV_Target2 to the diffuse and normal gbuffers (deferred) for a projector shader. Am I on the right track? I guess it would also be nice if I could change the RT per projector params (so I don’t change all projectors to the same RT’s.

Todo this same concept for meshs I could just use a CommandBuffer and DrawMesh, but I wasn’t sure about Projectors.

CommandBuffer

CommandBuffer buf = new CommandBuffer();
Camera.current.AddCommandBuffer (CameraEvent.BeforeLighting, buf);

// OnRenderObject
buf.SetRenderTarget(new RenderTargetIdentifier[] { 
	BuiltinRenderTextureType.GBuffer0, //color
	BuiltinRenderTextureType.GBuffer2 //normal
}, BuiltinRenderTextureType.CameraTarget);

// foreach Mesh
buf.DrawMesh (_decalMesh, decal.transform.localToWorldMatrix, decal.Material);

Shader

// ...
Pass {
	Tags {"LightMode" = "Deferred"}
	//...

struct rastInput {
		fixed4 albedo : SV_Target0;
		fixed4 normal : SV_Target2;
	};

	//...
	rastInput frag (fragInput i) {
		//...
	}
}
2

In this blog, you can find a few examples of very similar situations, especially the “Deferred Decals” example does almost exactly what you want to do, you just may want implement perspective projection instead of the box projection in the example.