ProjectorAdditive

Description

This shader is for the Projector component and will let you have an additive effect projected onto objects as opposed to the built in multiply effect.

Usage

Place this shader somewhere in your Assets folder hierarchy. Then, use it on a Projector component's material similar to how the blob shadow in the Standard Assets is set up.

ShaderLab - Projector Additive.shader

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Shader "Projector/Additive" { 
   Properties { 
      _ShadowTex ("Cookie", 2D) = "" { TexGen ObjectLinear } 
      _FalloffTex ("FallOff", 2D) = "" { TexGen ObjectLinear } 
   } 
   Subshader { 
      Pass { 
         ZWrite off 
         Fog { Color (1, 1, 1) } 
         ColorMask RGB 
         Blend One One 
         SetTexture [_ShadowTex] { 
            combine texture, ONE - texture 
            Matrix [_Projector] 
         } 
         SetTexture [_FalloffTex] { 
            constantColor (0,0,0,0) 
            combine previous lerp (texture) constant 
            Matrix [_ProjectorClip] 
         } 
      }
   }
}