[Papervision3D] Render mask

[James]

Hi,

I'm working on a personal AR idea, but I've got a little stuck.

I'm trying to make an AR business card, where it looks like there is a 
cube inside/behind the card.

The problem I'm having is, how to mask the cube, so it only renders the 
inside view.
I want it to appear as if there is a hole in the card and you are 
looking inside.
Ideally I would also like it, so that when you have the card at 45 
degrees, you can see the cube behind the card.

My first idea was to have a 3D plane the same shape/size as the card and 
render it white. This sort of works, but it also whites out the users 
fingers grasping the card.

-- 
James.
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