[Radiance-general] Using MIST for overcast sky

[Giulio Antonutto]

hi,
glow is considered as a light source by the direct component only within the
given distance (4th number of glow definition) and I guess "mist" doesn't
consider glow with 0 (or -1) because it is not a direct light source.
 
a quick and probably useless (**) trick is to change the sky description 
 
from
skyfunc glow skyglow
0
0
3 1 1  1
to
 
skyfunc light skyglow
0
0
3 1 1  1
 
this way the 1st bounce is now direct but -ds doesn't work on the sky and
there is just a big point source above so ...  (**) 
 
another trick (this time should be ok) is to create a big polygonal volume
of brightfunc-light-sources with the sky distribution... in this case you
could be able to use -ds.
 
hope it helps,
 
giulio
 
-----Original Message-----
From: radiance-general-bounces at radiance-online.org
[mailto:radiance-general-bounces at radiance-online.org]On Behalf Of Guedi
Capeluto
Sent: 16 April 2004 10:07
To: radiance-general at radiance-online.org
Subject: [Radiance-general] Using MIST for overcast sky


Hi,
 
I am trying to simulate the extinction of light inside a MIST volume, for
different sky conditions.
The simulations seems to work well using "sun" as the light source, but I
have problems when using an overcast sky or a sunny sky with no sun (-s
option).
The light sources for the MIST volume are "sun" and "sky" which is defined
using glow.
Did MIST work for glow type light sources? If not, what do you recommend to
use to simulate this case, with diffuse light coming from the sky?
 
Thank you in advance,
 
Guedi
--- 
Arch. Guedi Capeluto, D.Sc.
Faculty of Architecture and Town Planning
Technion - Israel Institute of Technology
Technion City, Haifa 32000. Israel.
Tel: +972.4.8294013    Fax: +972.4.8294617
email: arrguedi at tx.technion.ac.il
 

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