Curving D3D Space?

I have recently come across the problem of doing splines in D3D. I have heard it was possible to do such a task, however, it required me to calculate them myself. Do they mean calculate each voxel? If you believe this would take me too much time to do an you think I should do it in OGL, could you please send me a snipplet of code that will start up GL? For some reason my code works very very slowly and I can''t understand why. #2, If I have to use GL, is there any way of using DDraw for 2D rendering? Preferibly I would like to keep everything in DX but if this isn''t possible could you let me know before I get myself in too much trouble. Thanx Be kind to your wives and girlfriends by leaving the breast and thigh examination to Colonel Sanders!!!!