Subject:       Re: Anti-Aliasing in I3.0
Date:          Tue, 31 May 1994 09:25:00 GMT +1200
From: "Paul Batten" <BATTENP@scico1.chchp.ac.nz>

> 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 thershol
d
> 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 th
e
> time was very long.

The AA was one of the fisrt parameters i played with when i received V3.0 
two days ago. I traced the same scene with varying combinations of Rays and 
AA quality and found that even when the AA was set fairly low ~10 I could 
achieve a render time consistent with a ~35 setting by lowering the Max 
Rays to ~30. The end result was less jaggies for the same render time. The 
test was only with a simple sphere, so the Max Rays setting may have more 
effect with complicated scenes. All i can suggest is to experiment with a 
few settings prior to rendering, it could save a lot of time for large 
animations.

Cheers
Paul.
----------------------------------------------------------------------
 Paul Batten     Science & Computing Dept.    Christchurch Polytechnic
 battenp@scico1.chchp.ac.nz           Christchurch      New Zealand
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