[Radiance-general] Splotchy renders

[Greg Ward]

Hi Rob,

You need to look into the "rad" program, which will help you to set 
appropriate parameters for your environment.  When you have indirect 
illumination like this and you use the default rendering parameters, 
you get the kind of disappointing results you're seeing.  The rad tool 
will help you avoid these.  Also, the compamb script is probably 
failing because you are giving it your Radiance scene file(s) rather 
than the rad input file (usually .rif) that it expects.

A reasonable introduction to rad is included at the end of the first 
chapter in "Rendering with Radiance," which is distributed as a PDF in 
the file "ray/doc/pdf/RwR01.pdf" included with the 3.5 release.  If you 
don't have that, get it from the Radiance website:

	http://radsite.lbl.gov/radiance/book/ch1/ch1.pdf

-Greg

> From: "Fitzsimmons, Rob" <Rob.Fitzsimmons@Summit.Fiserv.com>
>
> Sorry for the bad link
> http://www.geocities.com/rastermon/splotchy.html
>
>
> I finally am playing around in Radiance - OS 10.5.1 and getting some
> o.k.
> results.
> However, I notice a lot of the renders are really spotty.
> http://www.geocities.com/SoHo/Lofts/5684/images/354_2002.jpg
>
> In rpict, I've tried -ab 200 and -ps 5
> Also looked at the list archives and tried compamb, but get these 
> errors
>
> [localhost:~/documents/radiance_stuff/strata2rad] robfitzs% compamb -c
> -e
> 354.rad
> 354.rad: unknown variable: void glow dim
> 354.rad: unknown variable: void glow dim
> rpict: system - cannot expand '@/usr/tmp/ca3355.opt': No such file or
> directory
> rpict: 0 rays, 0.00% after 0.000u 0.000s 0.000r hours on localhost
> /usr/tmp/ca3355.amb: file not found
> cavg: Subscript out of range.
>
> Thanks
> Rob