A possible solution.. or few:
- in ac3d, be sure that each subgroup and group center coordinates are 0,0,0. Object centers can be just about anything, but all groups have to be at origo.
- MaxDist definitions have to be also in all groups, not only in objects. Right click the group title in Hierarchy tree to edit properties.
- LOD Max and Min Dist definitions seem to go to objects or groups that are after "Objects" or "Ground" group.
I hope this helps... It was really a fight to make the new custom object visible in the game
