[Papervision3D] Large scenes

[Philippe Ajoux]

Since we are on the topic, how are you doing on view frustum culling 
(this is a term that means not drawing things the camera cannot see for 
those interested) Carlos? I tried adding it in as I hacked through 
Papervision, but the performance hit was rather large. However, I was 
not using the most clever ideas, simply running through triangle / plan 
clippers for each of the 4 view frustum planes.

--Phil