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Question by TheFloatingSheep · May 16, 2015 at 08:45 PM · shadershader programming

Shader Programming| Chroma key : Replace everything with transparent but purple

Hey! I have no experience in Shader Programming. What i have to change to make the script bellow to replace everything from the webcamtexture with transparent, but the color purple. And if it's possible to replace the color purple with black.

 Shader "DVision/Gloves" {
         Properties {
                 _MainTex ("Base (RGB)", 2D) = "white" {}
         }
         SubShader {
                 Tags { "Queue"="Transparent" "RenderType"="Transparent" }
                 LOD 200
                
                 CGPROGRAM
                 #pragma surface surf Lambert alpha
  
                 sampler2D _MainTex;
  
                 struct Input {
                         float2 uv_MainTex;
                 };
  
                 void surf (Input IN, inout SurfaceOutput o) {
                         half4 c = tex2D (_MainTex, IN.uv_MainTex);
                         o.Albedo = c.rgb;
                         if (c.g > 200.0/255.0 && c.r < 200.0/255.0 && c.b < 200.0/255.0)
                         {
                                 o.Alpha = 0.0; 
                         }
                         else
                         {
                                 o.Alpha = c.a;
                         }                              
                 }
                 ENDCG
         }
         FallBack "Diffuse"
 }


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