Moving single channel in a Texture(RGB) Unity3d shader

threechannelmovingfog.shader

Shader "Custom/ThreeColorShaderBackUp" {


properties{
 //_MainTex("Main Texture",2D) = "white"{}
 _MainTint ("Tint Color",color)=(1,1,1,1)
 _ColorA ("Color A",color)=(1,1,1,1)
 _ColorB ("Color B",color)=(1,1,1,1)
 
 _RChannelTex("R Channel",2D)=""{}
 _GChannelTex("G Channel",2D)=""{}

 _BlendTex("AlphaGuide Texture",2D)=""{}
 
 
  _ScrollXSpeed  ("Scroll Speed in X",Range(0,10))=2
 _ScrollYSpeed  ("Scroll Speed in Y",Range(0,10))=2
 
 
}
SubShader{
Tags { "RenderType"="Transparent" "RenderQueue"="Transparent"}
         LOD 200


	 CGPROGRAM
	 #pragma surface surf Lambert	 
	 float4 _MainTint;
	 float4 _ColorA;
	 float4 _ColorB;
	 float _ScrollXSpeed;
	 float _ScrollYSpeed;
	 sampler2D _RChannelTex;
	 sampler2D _GChannelTex;
	 sampler2D _BlendTex;
	 struct Input{
	 float2 uv_RChannelTex;
	 float2 uv_GChannelTex;
	
	 float2 uv_BlendTex;
	 };
	 void surf (Input IN, inout SurfaceOutput o) {
	 		float4 rTexData = tex2D(_RChannelTex,IN.uv_RChannelTex);
	 		float4 gTexData = tex2D(_GChannelTex,IN.uv_GChannelTex);
	 		float4 blendTexData = tex2D(_BlendTex,IN.uv_BlendTex);
			float4 finalColor;
			finalColor = rTexData;
			finalColor.a = 1.0;
			fixed2 ScrolledUV = IN.uv_GChannelTex;
			float XScrollValue = _ScrollXSpeed * _Time;
			float YScrollValue = _ScrollYSpeed * _Time;
			ScrolledUV += fixed2(XScrollValue,YScrollValue);
			half4 c = tex2D(_GChannelTex, ScrolledUV);
			float terrainLayers = lerp(_ColorA,_ColorB,blendTexData.r);
			finalColor *= terrainLayers;
			finalColor = saturate(finalColor);
			o.Emission = c.rgb;
			o.Albedo = (finalColor.rgb + c.rgb) * _MainTint.rgb;
			o.Alpha = finalColor.a;
		}
	 ENDCG
}
FallBack "Diffuse"
}