[Radiance-general] Confused by GenSky

[P George Lovell]

Greg, thankyou!

A change I made in my wrapper a few weeks ago left out the ab setting, 
now it's back and it works.

Thanks everyone,

George


On 18/09/2013 17:00, Greg Ward wrote:
> I assume you are rendering with -ab 1 or greater.  Otherwise, the sky 
> will never be sampled.
>
> -Greg
>
>> *From: *Paul Lovell <pgl2 at st-andrews.ac.uk 
>> <mailto:pgl2 at st-andrews.ac.uk>>
>>
>> *Date: *September 18, 2013 8:20:53 AM PDT
>>
>> *
>> *
>>
>> Hi Thomas,
>>
>> I just tried: Gensky settings: -ang 45 45 -s -B 55.87
>>
>> It works with +s [as it did before] but not with -s.
>>
>> George
>>
>> ------------------------------------------------------------------------
>> *From:* Thomas Bleicher [tbleicher at gmail.com]
>> *Sent:* 18 September 2013 16:00
>> *To:* Radiance general discussion
>> *Subject:* Re: [Radiance-general] Confused by GenSky
>>
>> 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 <mailto: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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-- 
Dr P. George Lovell,

Lecturer in Psychology
University of Abertay Dundee
Dundee
DD1 1HG

Tel 01382-308581
Fax 01382-308749

Researcher/Co-investigator,
School of Psychology, University of St Andrews

RM 2.27 (The Yellow Room).
Phone      (01334) 463056

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