Tex_coords in the B3D-Fileformat

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Hello,

in the progress of writing an B3D im-/exportplugin for HASHs Animation Master I'm a little confused about the text_coord_sets(1-8) and tex_coord_set_size(2-4) in the Vertex structure. For simple UV-coords for each vertex I have 1 set with a size of 2. But for what do I need more of these???? The reason I ask is because AM supports multiple texturemaps per polygon and maybe I can implement this in the exporter. Can someone explain this part of the B3D-fileformat for me???

Michael Hartlef