[Papervision3D] Masking: Raising an object out of a virtual hole

[Danny]

Hallo again folks!
I'm trying to open a pair of doors at the position of my AR Target in the
FLARToolkit and then raise my car from the cavity revealed. I have my car in
there, all my AR tracking is fine, it's the occlusion of items still in the
hole I can't figure out.

A similar effect is here on the ubiquitous FLAR new years demo:
http://www.youtube.com/watch?v=TW6_X9qBeds
They have the Pattern sink into the "ground" and then objects are able to
fire out of the hole.

It seems as though this is more than simple masking, as it appears to be
masking that takes Y into account when deciding what to mask. If one was
simply using a plane as a mask here, then objects couldn't rise past the
edges of the hole, they'd be masked.

Any ideas how this can be achieved? Thanks lads!
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