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Issue with animated .x files and multiple materials

I've been trying to export skinned and animated .x models with multiple materials on the same mesh but have found the skinning breaks when that happens. The animations work fine but the mesh stops wrapping around the bones properly (it seems) with what looks to be different vertices attaching themselves to different bones causing a stran...

Writing .x files

Hi, I have a bunch of polygons that are generated by my program (i.e. I manually calculate the position vectors for the vertices). I want to dump these to a .x file (or .fbx or any format I could reload later with XNA). Is there any C# or XNA API for doing this? 10x! Yoyo ...