Can you set actor parts (torso, head, limbs, attachments) to have their own atom groups? Or is AutoGenerate = 1 forced? Because it seems like it refuses to not use the sprites as the atom group even if I have AutoGenerate = 0 and define my own atom group.

MOPixels dont collide with atomgroups, they collide with the sprite itself. so unless youre planning on doing stuff with collisions between actors or the terrain, you're out of luck..

Actually, it's the terrain I'm trying to deal with. I guess I just didn't make the group big enough.

EDIT: Seems to be the case. New question though: If atom groups have a JointOffset, where in the atom group is that offset centered? I have no clue where I need to be positioning this thing in respect to the actual bodypart...

spriteoffset. so basically, if you have your spriteoffset set up correctly, the center of the sprite.

Basically from the 0,0 point for your atomgroups, which will generally be at the spritesoffset point.