CameraSpaceProjection Multiply

gistfile1.c

Shader "Custom/NoiseCameraSpace" {
	Properties {
		_MainTex ("Base (RGB)", 2D) = "white" {}
		_Overlay ("Overlay (RGBA)",2D) = "clear" {}
	}
	SubShader {
		Tags { "RenderType"="Opaque" }
		LOD 200
		
		CGPROGRAM
		#pragma surface surf Lambert

		sampler2D _MainTex;
		sampler2D _Overlay;
		
		struct Input {
			float2 uv_MainTex;
			float4 screenPos;
		};

		void surf (Input IN, inout SurfaceOutput o) {
			half4 c = tex2D (_MainTex, IN.uv_MainTex);
			
			half4 d = tex2D (_Overlay, IN.screenPos.xy/IN.screenPos.w);
			
			c *= d;
			
			o.Albedo = c.rgb;
			o.Alpha = c.a;
		}
		ENDCG
	} 
	FallBack "Diffuse"
}