[Papervision3D] Cannot access a property or method of a null object reference. Clone

[John Brookes]

http://www.shrewballooba.co.uk/CFC-a08/cfc.jpg
Im using clone() to make a clone of the big pig to create the piglet which
works fine except that I get artifacts/jagged objects (what's the term for
that?).

The big pig has useOwnContainer = true on the eyes snout ears etc to stop
that happening. How can I set it for the piglet?

function cloneCreature():void {
  var piglet:DisplayObject3D = creatureContainer.clone();
  scene.addChild(piglet);
  piglet.scale = .65;
  trace(piglet.childrenList()); // shows the snout as snout_0
  snout_0.useOwnContainer = true;
}

I've tried "snout_0.useOwnContainer = true;" but I get the error "Cannot
access a property or method of a null object reference."

I'm guessing that means its not ready/on the scene yet? What does it
actually mean?

How do you do something like this in AS3
php
if( isset(object)) {
...
}
and is that even an answer to the problem?

Also RenderStats
I assume
FPS = Frames per second.
mem = memmory
tri =  triangles
lin =  lines

what are the others?
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