Paul, Thanks for your input, but I think you've misunderstood me. I already use VBOs quite happily. The question is whether you can use a pre-render pixel stage to render directly into the vertex buffer (the technique is sometimes abbreviated RTVB); i.e. to use a fragment/pixel shader to populate vertex array data.
Anyway, I've got plenty to go on now, thanks to all for your help. Best regards, David
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