Anyone know how to change the size of a point with a vertex shader?

codeguyross1 · September 7, 2016, 9:51pm

Here is the shader

Shader "VertexColor" {
    SubShader {
    Pass {
        LOD 200
              
                 
        CGPROGRAM
        #pragma vertex vert
        #pragma fragment frag
  
        struct VertexInput {
            float4 v : POSITION;
            float4 color: COLOR;
        };
         
        struct VertexOutput {
            float4 pos : SV_POSITION;
            float4 col : COLOR;
        };
         
        VertexOutput vert(VertexInput v) {
         
            VertexOutput o;
            o.pos = mul(UNITY_MATRIX_MVP, v.v);
            o.col = v.color;
            return o;
        }
         
        float4 frag(VertexOutput o) : COLOR {
            return o.col;
        }
 
        ENDCG
        } 
    }
 
}

I have tried adding size to the vertex but it had no effect

Shader "Custom/VertexColorTest" {
    SubShader {
    Pass {
        LOD 200
              
                 
        CGPROGRAM
        #pragma vertex vert
        #pragma fragment frag
  
        struct VertexInput {
            float4 v : POSITION;
            float4 color: COLOR;
        };
         
        struct VertexOutput {
            float4 pos : SV_POSITION;
            float4 col : COLOR;
            float4 size : PSIZE;
        };
         
        VertexOutput vert(VertexInput v) {
         
            VertexOutput o;
            o.pos = mul(UNITY_MATRIX_MVP, v.v);
            o.col = v.color;
            o.size = 10.0;
            return o;
        }
         
        float4 frag(VertexOutput o) : COLOR {
            return o.col;
        }
 
        ENDCG
        } 
    }
 
}

Any help getting these points a little bigger would be awesome!

Namey5 · September 8, 2016, 7:28am

I unaware of a PSIZE semantic, but you should be able to scale vertices like so;

v.vertex.xyz *= size;