Unity 2018 Shaders and Effects Cookbook

How to do it...

To use a grab pass, you need to follow these steps:

1. Remove the Properties section, and the Input section; this shader will not use any of them.
2. In the SubShader section, remove everything, and add the following to ensure the object is treated as being Transparent:

Tags{ "Queue" = "Transparent" }

3. Then, below that, add a grab pass:

GrabPass{ }

4. After the GrabPass, we will need to add this extra pass:

Pass {  CGPROGRAM  #pragma vertex vert  #pragma fragment frag  #include "UnityCG.cginc"  sampler2D _GrabTexture;  struct vertInput   {    float4 vertex : POSITION;  };  struct vertOutput   {    float4 vertex : POSITION;    float4 uvgrab : TEXCOORD1;  };  // Vertex function  vertOutput vert(vertInput v)   {    vertOutput o; o.vertex = mul(UNITY_MATRIX_MVP, ...