MeshParts are a BasePart with a custom mesh and generated physics geometry for that mesh.

The customized physics geometry for the mesh is serialized as an internal property of the MeshPart instance.

Skinning

Our new mesh importer supports importing meshes with skeletal joint. This will be saved in the mesh's asset data.

Named joints defined within a MeshPart's mesh asset data can skin to connected MeshParts with the same name if it also have a mesh that includes a joint with the same name. Parts can be connected directly or indirectly by Motor6Ds, Welds, BallSocketConstraints, HingeConstraints, or other skinning-enabled joints within the same Model.

Mesh joints can also skin to Bone instances that are descendants of connected parts, or connected parts with a FileMesh referencing a skinned mesh.