Z Buffer Range

You **might** have success with setting the new range in the viewport structure passed to IDirect3DDevice*::SetViewport().

A simple alternative would surely be to alter the OpenGL style projection matrix just before it gets passed to D3D so that the post projection Z coordinates are in the range used by D3Ds clipper (0 to 1).

The driver on a T&L chip is very likely to be doing this for one of the APIs anyway (i.e. the clipper in the chip will either take D3D *or* OpenGL style Z ranges and the driver will alter the passed matrix accordingly).

Your code probably needs to alter matrices anyway to convert handedness and cope with OpenGL using "modelview" versus D3D separating the matrices etc...


Try either on the Reference Rasteriser, if the clipping is all screwed up, it won''t work on most hardware, otherwise it probably will.

--
Simon O''Connor
Creative Asylum Ltd
www.creative-asylum.com