Splotchy renders

radiance-general
1

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

2

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

···

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3

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" <[email protected]>

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
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

4

Hi Rob,

an interesting report (application case study) which provides concrete hints
on Radiance (esp. ambient) rendering parameter settings (amongst other
valuable info) can be found at:

http://www.pab-opto.de/radiance/render_vergleich/intro.html

(avail. in german and english)

-cb