The next release of Vizard will support using 3D texture coordinates, along with generating 3D texture data at run-time. Vizard has a quarterly release schedule, so the next release is planned for the beginning of April.
A current workaround would be to specify the 3d texture coordinates using the vertex color, then create a vertex shader that copies the color data into the texture coordinate data of the vertex. Let me know if you need any help with this.
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