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From: pyle@lll-lcc.UUCP
Newsgroups: comp.graphics
Subject: ray tracing and antialiasing
Message-ID: <657@lll-lcc.aRpA>
Date: Sat, 7-Mar-87 23:49:09 EST
Article-I.D.: lll-lcc.657
Posted: Sat Mar  7 23:49:09 1987
Date-Received: Sun, 8-Mar-87 14:48:47 EST
Organization: Lawrence Livermore Labs, Livermore Ca
Lines: 19
Keywords: ray tracing, antialiasing



I recently implemented a ray tracer with antialiasing.	I used the method
specified by Whitted (adaptive subdivision).  The technique works very
well, but I still get some jagged edges on curved surfaces and polygons,
no matter how deep the subdivision goes.  I talked to a Ph.D candidate,
and he thought it might be the RGB color space I was using.  He said that
in RGB space, colors did not average right.  I have seen several pictures
generated by adaptive subdivision in the journals, and they look just great.
Is the simple filter of averaging the four corners of a pixel square inadaquate?
Is distributed ray tracing the way to ultimately antialianize an image?
If it helps, I'm generating my pictures on a Raster Technologies box,
Model/80, 512 X 512.  If possible, please respond via E-Mail.



Thanks,
 
Ernie Pyle