Displaying part of an image?

You can use this with

Graphics 640,480
Local mycaps:TG_D3DDEVICEDESC7 = New TG_D3DDEVICEDESC7
D3D7GraphicsDriver().Direct3DDevice7().getcaps mycaps
Print mycaps.wMaxUserClipPlanes

to see how many clip planes your card supports.
I wonder why Bmax doesn't use a real DX viewport?