coll_ob = base->object;
if(coll_ob->dup_group){
   GroupObject *go;
   Group *group = coll_ob->dup_group;
				
   for(go= group->gobject.first; go; go= go->next){
	coll_ob = go->ob;
	collmd = (CollisionModifierData *) modifiers_findByType (coll_ob, eModifierType_Collision);