Shader wants texture coordinates...

Question

Hi folks,

I'm trying to create a shader that does a couple of things:

1) Uses vertex lights

2) Uses the vertex colours

3) Modifies these by another colour/vector (don't mind which)

4) DOES NOT USE TEXTURES

As such, I've managed to fumble my way through the various guides and things and come up with:

 Shader "Custom/MobileVertexLitVertexColouredAndBaseColoured" 
 {
     Properties 
     {
         _Color ("Main Color", Color) = (1,1,1,1)
     }
     
     SubShader 
     {
         Pass 
         {
             Material 
             {
             }
             ColorMaterial AmbientAndDiffuse
             Lighting On
             SetTexture [_MainColor] 
             {
                 Combine primary, primary
             }
             
             SetTexture [_MainColor] 
             {
                 constantColor [_Color]
                 Combine previous * constant DOUBLE, previous * constant
             } 
         }
     }
 }

Now, of course, I've got two lovely 'SetTexture' commands in there that I don't really want - I don't want textures! But, of course, those segments of the shader are also what allows that 'constantColor' to be used.

The shader works, but - understandably - complains about the fact that I have no UVs. Is there an alternative way to do what I require in some other (presumably poorly documented) pass, that doesn't require a UV set? I'd rather not kluge my way around the issue by creating a texture and a bunch of useless UVs.

Many thanks for any hints. I appreciate your time, and hope I've specified the question well and clearly enough to be useful.

Answer 1

You can do it with a surface shader.

Tested code...

 Shader "Custom/MobileVertexLitVertexColouredAndBaseColoured" {
     Properties {
         _Color ("Main Color", Color) = (1,1,1,1)
     }
 
     SubShader {
         Tags {
             "RenderType" = "Opaque"
         }
        
         CGPROGRAM
         // the noforwardadd option makes it use vertex lights only + 1 directional per-pixel light
         #pragma surface surf BlinnPhong noforwardadd
        
         float4 _Color;
  
         struct Input {
             float4 color: Color; // Vertex color
         };
  
         void surf (Input IN, inout SurfaceOutput o) {
             o.Albedo = _Color.rgb + IN.color.rgb; // additive blend
         }
         ENDCG
     }
 //    FallBack "Diffuse" // disable during development
 }

The above shader does use one per-pixel light but if you really don't want it, you will need to do custom lighting.

Here's some surface shader examples from the unity reference.

Surface Shader Examples

Shader wants texture coordinates...

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