How to work out the xyz coords of 2d screen?

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I was toying around with a simple r-type like game but using the 3D graphics. THis meant having a camera that scrolled along regularly, and a boundary on the ship XY and Z that needed to keep it from dissappearing off-screen.

I used a similar technique to Big10p's suggestion. Providing the camera isnt going to move relative to the player ship and play area, then this seems the most efficient and straigtforward option.