[Radiance-general] Re: Gensky too bright

[Greg Ward]

I was expecting someone to answer this by now...

The sky is not too bright, you just need to readjust your exposure to 
outdoor conditions.  It's like shooting with a camera, you can't expect 
the same f-stop and shutter speed to work in your basement as in your 
back yard.

An ambient level close to what is recommended in the gensky output is 
appropriate.  Your output recommends 13.1, so add a line "render= -av 
13.1 13.1 13.1" to your rad input file for outdoor views.  The exposure 
level corresponding to this is 0.5/13.1, or EXPOS=0.04.

Give it a try.
-Greg

> From: "Fitzsimmons, Rob" <Rob.Fitzsimmons@Summit.Fiserv.com>
> Date: Mon Aug 18, 2003  1:09:26  PM US/Pacific
>
> Why is it that when I use gensky, my scene gets blown out - the light 
> is way
> to bright?
> Is it the skyfunc that is blasting the scene or is it the sun?
> Gensky is my only light source.
> When I render, the scene is almost all white - a few grays in shadow 
> areas.
> I have a rif with exposure set to 1
> I'm also using -av .1 .1 .1 - is that redundant with skyfunc?
>
> Thanks
>
> Below is pertinent information
>
> gensky 12 05 12:00PST +s -a 44.8 > Dec5.rad
>
> # gensky 12 05 12:00PST +s -a 44.8
> # Local solar time: 12.03
> # Solar altitude and azimuth: 22.8 0.4
> # Ground ambient level: 13.1
>
> void light solar
> 0
> 0
> 3 5.54e+06 5.54e+06 5.54e+06
>
> solar source sun
> 0
> 0
> 4 -0.006430 -0.921525 0.388266 0.5
>
> void brightfunc skyfunc
> 2 skybr skybright.cal
> 0
> 7 1 5.97e+00 1.08e+01 3.49e-01 -0.006430 -0.921525 0.388266
>
>
> here's the Rif file:
>
> # the inside of this space:
> ZONE= I  -8         8        -8   8 -1.30337e-06   1.47222
> # xmin xmax ymin ymax zmin zmax
> QUALITY=m
> RESOLUTION= 1024 1024 0
> REPORT= 10 kamal2.err
> INDIRECT= 3
> PENUMBRAS= F
> DETAIL=m
> VARIABILITY= m
> AMBFILE= kamal2.amb
>
> render= -av .1 .1 .1
>
>
> scene= Dec5.rad
> scene= house_couch_mat.rad
> scene= kamal2.rad
>
> EXP = 1
>
> #view= v2b -vf plan.vp
> view= v0a -vf k2.vp
> #view= v1 -vf K1.vp
> #view= v3 -vf kitch.vp
> #view= v4 -vf fisheye.vp
> #view= v5 -vf plan.vp