[Radiance-general] strange artifacts in rendering

[Greg Ward]

Hi MJ,

Can you send me your model & rendering parameters off-list.  I won't know what's going on until I play with it.

Thanks,
-Greg

> From: Minjung Kim <mkim85 at gmail.com>
> Subject: [Radiance-general] strange artifacts in rendering
> Date: August 17, 2015 5:30:37 PM EDT
> 
> Hi everyone,
> 
> I am getting strange artifacts in my renderings, and am wondering which parameters to tweak in order to get rid of them. The artifacts look like a white, or sometimes half-black and half-white, patch at random locations. See below for examples:
> 
> http://minjung.ca/tmp/artifacts1.png
> http://minjung.ca/tmp/artifacts2.png
> 
> I've tried (1) setting ad = 4096, as = 1024, and (2) setting aa = 0, ar = 0, but neither of these two settings fixed the problem. Do you have any idea what might be happening? Here are some possibly relevant factors: 
> 
> - The object is completely Lambertian.
> - The only light source in the scene is a glow source that is positioned behind the camera, and covers as much of the sky as possible. 
> - I don't think I've ever encountered such artifacts with untextured stimuli.  I could be wrong, though.
> 
> Thanks in advance!
> 
> MJ
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