A.D.A. Amiga Demoscene Archive

Nice fast rotozoom and tunnel effects on a stock A500. Anyone know how its done so fast?

@retrocoder:

There's a thread here about some of Chaos's effects (rotozoom and tunnel) in Roots / Sanity (A1200 demo). Might be interesting to have a look there.

Z5: That thread is about doing the 3d rotator which uses a copper trick.

RetroCoder: Check the post from Ultra in this thread:

http://ada.untergrund.net/forum/index.php?action=v thread&forum=4&topic=217

Also check this post by Kalms in another thread who explains very clearley an A500 c2p using the blitter :-

http://eab.abime.net/showthread.php?t=21667

If you mean the texture tunnel at the start of Arte that isn't done with C2P. Basically you have a 1 pixel high 16 colour repeating bitmap for each size that you need. Then you get the copper to display the correct line using modulos or bpl pointers. Then at the start of each scan line you load in the colours for that line. Arte does this and uses sprites over the top for the connecting vertical bars.