MilkShape 3D is a versatile 3D modeler tool. It can save your own models in proprietary format .ms3d, or import/export existing models from a huge list.
yYu can draw your own model skeletons, assigning/creating new materials (like textures), and visualize them in four separate view panels, each one with his own display configuration and settings... (
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The program works with the following extensions:
ms3d