[Papervision3D] Determining dimensions of Collada objects

[autob0t]

I am just learning Papervision3D and the whole idea of importing actual 3D
models into Flash. 

One thing I cannot seem to figure out is once a Collada model is imported
into Papervision3D how does one determine it's size? To me this is very
important in programming how an object will interact with it's environment.
I know there are methods for hitTestObject and hitTestPoint but what if I
want to know the exact height of an imported Collada model? Most 3D models
are not perfect square boxes so the space they occupy in 3D space is not
perfectly square but there must be a bounding box of some sort around each
object and if so there must be some property that tells the X,Y, and Z
dimensions. Am I completely off-track here and I should be thinking about
this differently?

I've watched other peoples demos here: 
http://blog.papervision3d.org/category/demos/
http://blog.papervision3d.org/category/demos/  and they're amazing but after
watching some of them I figure they must be doing something to figure out
the height of objects?  I am really stumped.

Any pointers or suggestions would be appreciated as I try and learn more
about Papervision3D.
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