iPhone Shader, blend from vertex rgb color?

[reissgrant]

Is it possible to blend three textures in a shader based on vertex color for iPhone?

It seems the only option to use for blending is only the alpha channel of the vertex color, or alpha channel of a texture. Is there any way to use the vertex RGB values?

[reissgrant]

OK, figured it out. Had to make it a two pass, but it'll work.

Here it is in case anyone needs it:

1.) Paint 0 alpha for texture 1

2.) Paint 1 alpha for texture 2

3.) Paint White for texture 3

///////////////////////////////////////////////////////

    Shader "iPhoneVertexBlend" {

    Properties {

        _MainTex ("Texture 1  (white vertex A)", 2D) = ""
        _Texture2 ("Texture 2  (black vertex A)", 2D) = ""
        _Texture3 ("Texture 3  (black vertex A)", 2D) = ""

    }

    SubShader {

        BindChannels {
            Bind "vertex", vertex
            Bind "color", color
            Bind "texcoord", texcoord

        }

        Pass {

            SetTexture [_MainTex]  {    Combine texture - primary}
            SetTexture [_Texture2] {    Combine previous Lerp(primary) texture}

        }

        Pass {

            Blend One OneMinusSrcColor  
            SetTexture [_Texture3] {    Combine texture * primary}

        }
    }

}