Specific UVW for a shader ?

[Helper]

On 09/08/2014 at 01:01, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   R15 
Platform:   Windows  ;   
Language(s) :     C++  ;   PYTHON  ;

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Hello,

I am searching a way to set a specific UVW to a shader, to make transition between two textures or to apply lightmaps.

I know there is the Projection Shader, it allows to change the projection mode of the shader, but not to set the UV we want.

So I search a way in Python or C++, with ShaderData, but I don't know how to tell to the shader to take the ChannelData of an other TextureTag (furthermore, the ChannelData of the ShaderData is "read-only").

Anyone have an idea ?