howto make keystone with Blitz3d?

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I don't have Blitz3D installed any more as I've been using Blitzmax for the last year or so.

I *think* there's a sample game called Insectoids that comes with the Blitz3D samples, which renders the game screen to a texture and applies it to a cube. Maybe that will get you going in the right direction as the principle is the same.