[Radiance-general] Confused by GenSky

[Greg Ward]

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>
> 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> 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
> 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.radiance-online.org/pipermail/radiance-general/attachments/20130918/e5c8eea3/attachment.html>