2 Texture Smooth Blending

Blend2Textures.shader

Shader "Blend 2 Textures" {
Properties {
    _Blend ("Blend", Range (0, 1) ) = 0.5 
    _MainTex ("Texture 1", 2D) = "" 
    _Texture2 ("Texture 2", 2D) = ""
}

SubShader { 
    Pass {
        SetTexture[_MainTex]
        SetTexture[_Texture2] { 
            ConstantColor (0,0,0, [_Blend]) 
            Combine texture Lerp(constant) previous
        }       
    }
} 

}