I'd suggest you stick with clip planes or use one of the other methods of drawing part of an image that utilise UV co-ordinates. TonyG's code, whilst simple in it's implementation, is just too slow for real-time usage.
SetViewPort
BlitzMax Forums/BlitzMax Programming/SetViewPortThe forum is locked. These are the original blitzbasic.com forums, kept so they can still be read. No new topics, replies or edits can be made here. To join in, head over to the Blitz3D+ forums.