Dissolve With Texture

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The dissolving shader at work.

Description

A simple "dissolving" surface shader for Unity 3. It uses an image as guidance to remove pixels - with randomly generated clouds or noise, it generates a neat dissolving effect. This shader should work with most graphics cards.

Usage

You'll most likely want to alter the amount of dissolving at runtime, which is easily done by using SetFloat() to alter "_SliceAmount", like here:

renderer.material.SetFloat("_SliceAmount", 0.5 + Mathf.Sin(Time.time)*0.5)

(causes the attached object with this shader to dissolve in/out)


Source code

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// simple "dissolving" shader by genericuser (radware.wordpress.com)
// clips materials, using an image as guidance.
// use clouds or random noise as the slice guide for best results.
  Shader "Custom Shaders/Dissolving" {
    Properties {
      _MainTex ("Texture (RGB)", 2D) = "white" {}
      _SliceGuide ("Slice Guide (RGB)", 2D) = "white" {}
      _SliceAmount ("Slice Amount", Range(0.0, 1.0)) = 0.5
    }
    SubShader {
      Tags { "RenderType" = "Opaque" }
      Cull Off
      CGPROGRAM
      //if you're not planning on using shadows, remove "addshadow" for better performance
      #pragma surface surf Lambert addshadow
      struct Input {
          float2 uv_MainTex;
          float2 uv_SliceGuide;
          float _SliceAmount;
      };
      sampler2D _MainTex;
      sampler2D _SliceGuide;
      float _SliceAmount;
      void surf (Input IN, inout SurfaceOutput o) {
          clip(tex2D (_SliceGuide, IN.uv_SliceGuide).rgb - _SliceAmount);
          o.Albedo = tex2D (_MainTex, IN.uv_MainTex).rgb;
      }
      ENDCG
    } 
    Fallback "Diffuse"
  }
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