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Question by novosadvitalya · Nov 20, 2019 at 06:19 PM · shader programmingtransparentshader writing

How to make the intersection area transparent if they have the same color?

There are several sprites of shapes in different colors. I can move these shapes. When I move them, I want the intersection of two shapes of the same color to become transparent. As far as I understand, the only right way is to write a shader.

I tried to write this shader. Here he is

 Shader "ddShaders/dd_AddColor" {
     Properties
     {
         _Color ("Tint Color", Color) = (1,1,1,1)
     }
 
     SubShader
     {
         Tags 
         { 
         "Queue"="Transparent"    
         }
         Cull Off
         Lighting Off
         ZWrite Off
         Fog { Mode Off }
 
         Blend OneMinusDstColor OneMinusSrcColor 
         BlendOp Add
        
         Pass
         {
        
             CGPROGRAM
             #pragma vertex vert
             #pragma fragment frag
             uniform float4 _Color;
             #include "UnityCG.cginc"
  
             struct vertexInput
             {
                 fixed4 vertex: POSITION;
                 fixed4 color : COLOR;  
             };
  
             struct fragmentInput
             {
                 fixed4 pos : SV_POSITION;
                 fixed4 color : COLOR0;
             };
  
             fragmentInput vert( vertexInput i )
             {
                 fragmentInput o;
                 o.pos = UnityObjectToClipPos(i.vertex);
                 o.color = _Color;
                 return o;
             }
  
             half4 frag( fragmentInput i ) : COLOR
             {
                 
                 return i.color;
             }
  
             ENDCG
         }
     }
 }

But he does not make the intersection area transparent, but only makes an illusion. More specifically, the intersection area takes the background color. Therefore, if I have another object that is behind these shapes on another layer, then it will not be visible. Here is the result: alt text

But I want this:alt text

5.png (3.1 kB)
55.png (1.2 kB)
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Answer by trevornovah · Oct 06, 2020 at 11:23 AM

Hi Novosadvitalya,

Although I couldn't solve your problem but many thanks to you for your intersection transparent shader code. I really needed that. I appreciate it and I hope you have found the solution to your problem by now.

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avatar image novosadvitalya · Oct 06, 2020 at 12:16 PM 0
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Hi! Unfortunately, I could not find :(

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