[Radiance-general] Confused by GenSky

[Thomas Bleicher]

Have you tried adding a sky radiance level explicitly? I can't remember the correct option right now. 

Paul Lovell <pgl2 at st-andrews.ac.uk> wrote:

>Hi Everyone,
>
>It's been some time since I asked a dumb question of the clever people
>at radiance-general, so here goes...
>
>I'm trying to render some scenes with varying illumination, in
>particular I want to vary the diffuseness of the illumination.
>
>Currently I'm doing this with a hemi-field of spherical lights, with a
>non-homogenous density. This works fine for example
><http://www.youtube.com/watch?v=zhsMeTtIPFA&list=HL1379509671&feature=mh_lolz>
>
>However, that's for my made-up illumination, I need to confirm that
>what I'm doing bears any relationship to "real" illumination, i.e.
>using gensky with "+s", "-s" etc.
>
>I've tried rendering the same scene while specifying the sun position
>using gensky, for example this works fine:
>
>% Gensky settings: -ang 45 45 +s
>%
>% # C:\Program Files (x86)\MinGW-Radiance\bin\gensky -ang 45 45 +s
>% # Ground ambient level: 14.8
>%
>% void light solar
>% 0
>% 0
>% 3 6.77e+006 6.77e+006 6.77e+006
>%
>% solar source sun
>% 0
>% 0
>% 4 -0.500000 -0.500000 0.707107 0.5
>%
>% void brightfunc skyfunc
>% 2 skybr skybright.cal
>% 0
>% 7 1 9.56e+000 2.12e+001 5.71e-001 -0.500000 -0.500000 0.707107
>%
>
>However, when I try with the -s sky:
>
>% Gensky settings: -ang 45 45 -s
>%
>% # C:\Program Files (x86)\MinGW-Radiance\bin\gensky -ang 45 45 -s
>% # Ground ambient level: 14.8
>%
>% void brightfunc skyfunc
>% 2 skybr skybright.cal
>% 0
>% 7 1 9.56e+000 2.12e+001 5.71e-001 -0.500000 -0.500000 0.707107
>
>It just fails to render "pfilt: picture too dark or too bright ". The
>-c -u -i skies also don't render.
>
>I'm running minGW radiance in windows (with a Matlab wrapper), the +s,
>-s, -c and -u skies work fine when I specify time and geographical
>location with gensky, but I want to specify the exact sun position.
>
>Anyone have any suggestions?
>
>best wishes,
>
>George
>
>
>
>
>
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