Subject: Anti-Aliasing in I3.0
Date: Mon, 30 May 1994 15:41:57 -0700
From: "Robin Chytil" <robin@sgls.lausanne.sgi.com>

Hi !

I don't understand what is the way to set up anti-aliasing in Imagine3.0.
First, I understand that you have to put F(alse) for "use old antialiasing"
flag. But then, there are 2 settings : "Maximum number of rays" and "Threshold"
(something like that).
In order to improve the anti-aliasing quality, what would be a good setting ?
If i remember well, I left 255 for max number of rays and lowered the thershold
from 30 (default) to 10, got a good anti-aliasing (checkered ground) in ray
trace (of course, as as I understood it AA it not working in Scanline), but the
time was very long. Actually I was testing the DOF (very nice), put 3 king
chess pieces on a checkered ground, and wanted to improve the image quality.
The time was long maybe because of the DOF feature, but they say in the text
relative to DOF that using this feature does not increase rendering time so
much.

Anybody knows, anybody experienced anything ?

Robin

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Robin Chytil, Staff Engineer		    Email: robin@lausanne.sgi.com
Silicon Graphics Inc.			    Vmail: 5-9389
Mediterranean Distribution Territory	    Tel:   +41 21 6249737
Lausanne, Switzerland			    Fax :  +41 21 6259184




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