use 2 or more passes in surface shader?

Unity Engine
1

How would this be possible?

2

Or, how can i duplicate vertices in a vertex frag without using additional passes?

3

I’m not exactly sure about the limitations (as surface shaders produce multiple passes), but I managed to add extra (non-surface shader) passes like this:

	SubShader 
	{
		Pass {Colormask 0}

		CGPROGRAM
		#pragma surface surf BlinnPhong alpha
		// surface shader code
		ENDCG
	}

Just make sure to keep the cgprogram outside any pass blocks. For this simple case of transparent z-culling the multiple passes work fine (although I never tested it with deferred shading).

If you need surface shaders for both passes, I don’t think it is possible. You should probably just use 2 materials in that case.

4

To be more clear, I will need both the vertex and frag functions to be in several passes like a fur shader, or any other way of duplicating same vertices in one pass is also okay.

5

Surface shaders generate a number of passes, and aren’t compatible with the addition of arbitrary passes. If you’d like to build a shader that uses multiple passes for each rendering stage, you should compile your current surface shader with the #pragma debug directive, and then work from the code produced by that.

6

if you need smth like fur shader effect, you can either duplicate your object several times or add several materials with different offset parameter instead.

I am not aware of any other easy way to get several surface passes :expressionless: