[SHADER] I want to have a shader that makes objects behind it semi-transparent.

I have been using this shader for a while now. It stops objects from underneath from rendering. (So I can use it as a mask. It's handy for AR development.)

Code (CSharp):

1. Shader "Custom/InvisibleMask"
2. {
3.     SubShader
4.     {
5.         // draw after all opaque objects (queue = 2001):
6.         Tags{ "Queue" = "Geometry+1" }
7.         Pass{
8.         Blend zero one  // keep the image behind it
9.     }
10.     }
11. }

I want to modify this shader so that the objects behind become semi-transparent rather than invisible.

Is that at all possible? I know nothing about shader code, so I can't do it myself.

 

I have figured it out!

Code (CSharp):

1. Shader "FX/VertexLit ShowThrough" {
2.     Properties{
3.         _Color("Main Color", Color) = (1,1,1,1)
4.         _MainTex("Base (RGB)", 2D) = "white" {}
5.     _OccludeColor("Occlusion Color", Color) = (0,0,1,1)
6.     }
7.         SubShader{
8.         Tags{ "Queue" = "Geometry+5" "RenderType" = "Transparent" }
9.         // occluded pass
10.         Pass{
11.         ZWrite Off
12.         Blend SrcAlpha OneMinusSrcAlpha
13.         ZTest Greater
14.         Color[_OccludeColor]
15.     }
16.         // Vertex lights
17.         Pass{
18.         Tags{ "LightMode" = "Vertex" }
19.         ZWrite On
20.         Lighting On
21.         SeparateSpecular On
22.         Material{
23.         Diffuse[_Color]
24.         Ambient[_Color]
25.         // Emission [_PPLAmbient]
26.     }
27.         SetTexture[_MainTex]{
28.         ConstantColor[_Color]
29.         Combine texture * primary DOUBLE, texture * constant
30.     }
31.     }
32.     }
33.         FallBack "Diffuse", 1
34. }