[Radiance-general] What's causing these artifacts???

[Fitzsimmons, Rob]

 What is your -aa ambient accuracy set at?
Also - does your rif have the correct size
ZONE= I  
I find that I often forget to update this when I create another rif based on
a previous rif

Rob

-----Original Message-----
From: Marcus Jacobs
To: radiance-general at radiance-online.org
Sent: 12/5/2005 10:07 AM
Subject: [Radiance-general] What's causing these artifacts???

Dear Group

In some of my recent renders, I have encountered some very specious 
artifacts. I generally specify a high number of ambient division
(usually 
around 3072) and ambient super samples (500-1000) for my renders.

The first ones are these mysterious dark splotches:

http://pg.photos.yahoo.com/ph/marcdevon/detail?.dir=b3e9&.dnm=4bcbre2.jp
g&.src=ph

http://pg.photos.yahoo.com/ph/marcdevon/detail?.dir=b3e9&.dnm=c76fre2.jp
g&.src=ph

I really can't figure out what's causing these. I am unsure if this is 
caused by poor interpolation. Also, occasionally I have come across the 
following bright spots:

http://pg.photos.yahoo.com/ph/marcdevon/detail?.dir=b3e9&.dnm=e02ere2.jp
g&.src=ph

No matter how many ambient divisions that I specify (I went up to 16,000

ambient divisions with 2000 ambient super samples),  I can't get rid of 
these bright spots. The problem with these particular artifacts is that
I 
can not predict when it will occur. What I need the most when performing

renders is predictability. Does anyone have any ideas?

Thanks

Marcus



_______________________________________________
Radiance-general mailing list
Radiance-general at radiance-online.org
http://www.radiance-online.org/mailman/listinfo/radiance-general