[CarlosRamos]

I didn't post more of the script because it's a mess right now Anyway, I think it was my fault... The thing I'm trying to do is to detect the collision with only a child of a model. I didn't mention that in my original post for the sake of simplicity, but after checking it, it seems that's the problem, the object I get on the collision event is the parent, not the child.

child = model.getChild("Plane06")
child.enable(viz.COLLIDE_NOTIFY)

...

def CollideNot(e):
     if e.obj2 == child:
         print "child"
     if e.obj2 == model:
         print "model"

It will print "model", but never "child". Is there any way to do this?