So, before I used Blender I was using Milkshape, and in Milkshape you could assign models to specific smoothing groups, which was useful in prop physics as it made it so I could have distinct hitboxes without the usual melting into a sludge ball of polygons that I usually get from exporting hitboxes, I've been using Blender for a while now but have been unable to find out how to assign smoothing groups in it to prevent my hitboxes from doing that melting thing.