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Question by gangafinti · Jun 30, 2015 at 06:44 PM · shader

Why wont my shader work.

I have been, reading http://http.developer.nvidia.com/CgTutorial/cg_tutorial_chapter01.html and I understand more and more about how shaders work. But now I am trying to make my own shader from scratch and I am running in to some difficulties. I want only vertex colors this is my code:

 Shader "Custom/NoobShader_01" {
     Properties {
         _Color ("Color", Color) = (1,1,1,1)
     }
     SubShader {
         Pass{
         CGPROGRAM
         #pragma vertex vert
         #pragma fragment frag
         
         float4 _Color;
         
         struct VertexOutput
         {
             float4 vertex : SV_POSITION;
             float4 color : COLOR;
         };
 
         VertexOutput vert (float4 vertex : POSITION)
         {
             VertexOutput OUT;
             //OUT.vertex = vertex;
             OUT.vertex = mul(UNITY_MATRIX_MVP, vertex);
             OUT.color = _Color;
             return OUT;
         }
         
         void frag()
         {
         
         }
         ENDCG
         }
     } 
     FallBack "Diffuse"

I have some questions also. 1. Unity didn't see position as key word, does vertex mean the same thing? 2. Can I leave my frag empty? Isn't there a way to remove the frag entirely because I tried that but then it it gives a warning.

**EDIT

So now I made this and it works:

 Shader "Custom/NoobShader_01" {
     Properties {
         _Color ("Color", Color) = (1,1,1,1)
     }
     SubShader {
     
         
         
         Pass{
         CGPROGRAM
         #pragma vertex vert
         #pragma fragment frag
         
         float4 _Color;
         
         struct VertexOutput
         {
             float4 vertex : SV_POSITION;
         };
         
         struct FragmentOutput
         {
             float4 color : COLOR;
         };
 
         VertexOutput vert (float4 vertex : POSITION)
         {
             VertexOutput VOUT;
             //OUT.vertex = vertex;
             VOUT.vertex = mul(UNITY_MATRIX_MVP, vertex);
             return VOUT;
         }
         
         FragmentOutput frag()
         {
             FragmentOutput FOUT;
             FOUT.color = _Color;
             return FOUT;
         }
         
         
         
 
         ENDCG
         }
     } 
     FallBack "Diffuse"
 }

But are these vertex colors??

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avatar image gangafinti · Jun 30, 2015 at 06:54 PM 0
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Aaaah, I always need a frag right? Because else the fragments won't be drawn?

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