While I believe it might be possible to do, the performance wouldn't be that great.

http://support.microsoft.com/default.aspx?scid=kb;en-us;824622

If you truely need a cross platform engine, you should probably look into Torque. It's not quite as easy as 3dgs, but it does have Mac support.

Never argue with an idiot. They drag you down to their level then beat you with experience