Raycasting, but not sending a ray step by step?

The 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.

Devils Child

i've been going trough my old codes and discovered my lost appetite for raycasting. i coded a raycayster which sends a ray out for each pixel line _step_by_step_. this is slow, but even worse: it's low quality!
i tried a line_intersect_line function to get the thing faster and better quality, but that doesnt work either.

is there any algorithm to send a ray not_step_by_step, but in a way to calculate the intersection point? i guess a lines_intersect function would be slow, since i tried that out...

any other ways?
if i know how that works i can go on to extended raycasting which supports staircases etc... jus like doom1

thanks for any help :)