The 3ds format probably doesn't support pivots, so things which Milkshape thinks are pivots are being exported as ( invisible? ) meshes.
B3D format should have both meshes and pivots. However, it depends exactly what you're doing here. In order to be a separate mesh in the hierarchy, the objects need to be separate/detached in Milkshape, and/or they need a separate material.
If you can, upload the model so that we can take a better look.
B3D format should have both meshes and pivots. However, it depends exactly what you're doing here. In order to be a separate mesh in the hierarchy, the objects need to be separate/detached in Milkshape, and/or they need a separate material.
If you can, upload the model so that we can take a better look.