Path: utzoo!attcan!uunet!lll-winken!lll-ncis!helios.ee.lbl.gov!pasteur!ames!oliveb!felix!dhw68k!stein
From: stein@dhw68k.cts.com (Rick Stein)
Newsgroups: comp.graphics
Subject: 3D Pixel Transforms
Keywords: Pixel arrays, 3D transformations
Message-ID: <17963@dhw68k.cts.com>
Date: 5 Jan 89 20:31:25 GMT
Reply-To: stein@dhw68k.cts.com (Rick Stein)
Distribution: na
Organization: Wolfskill residence; Anaheim, CA (USA)
Lines: 17
Followup-To:comp.graphics


I'm curious to know about how one performs rotations on pixel
data.  If I have several scans from a tomography machine, I
want to reconstruct and visualize this data in 3d.  Given that
each scan is a 2d pixel array, how would I stack these slices
and then transform (eg., translate/rotate) this pile of pixels?

I guess one could perform 1Million matrix multiplies (assuming
a 1K x 1K display).  Are there any other ways?  Obviously, if
I can create some polygons from the pixels, then the # of multiplies
will diminish.

Any suggestions/references for pixel manipulations (ala Pixar)?
-- 
 Rick 'Transputer' Stein ( My mother was a clairvoyant. :-) )
 uucp:{felix, spsd, zardoz}!dhw68k!stein        
 Internet: stein@dhw68k.cts.com