Hi Andrew,

Could you convert your PrimitiveSet to a DrawElement and modifiy the index list 
to remove the hidden primitives? You could then turn off display lists and turn 
on VBOs such that the driver only needs to send the index list when it gets 
changed. I don't think OSG supports partial updates of buffers, but you could 
split up your PrimitiveSet into multiple DrawElements based on which primitives 
were likely to be hidden or unhidden together.

Cheers,
Brendan

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