3ds Max Exporter
Exports a Half-Life2 SMD from 3ds Max.
Supports Physique, Skin, and Bones Pro. Supports blending of vertices. This is a modified version of the SMD exporter included in the SourceSDK.
3DS Max Importer
Loads both reference and animation SMD's. Supports weights in the SMD file and will create a skin modifier for the reference model. Rebuilds the smoothing groups from the vertex normals in the SMD file .