[Radiance-general] question about sky.mat

[imenslama at voila.fr]

Hi,
Thank you Thomas
regards
Imène




> Message du 16/07/12 à 19h51
> De : "Thomas Bleicher" 
> A : "Radiance general discussion" 
> Copie à : 
> Objet : Re: [Radiance-general] question about sky.mat
> 
> On Mon, Jul 16, 2012 at 6:35 PM,  wrote:
> Hi community,
> In radiance tutorial, for simulation of daylighting, we must create a file named sky.rad and an other file named sky_overcast.mat.
> I don't know which tutorial you refere to but I think that the general idea is to separate the scene elements that create the sky from the description that defines the actual sky condition. 
> In Radiance you first have to define a "material" for a scene element and then you apply this material to a geometric object like a polygone or a disk. For the sky description there is a special type of geometry which is called "source". This is, I expect, what you use in the sky.rad file in your tutorial.      But I can't find a description of the second file, I mean sky_overcast.mat. I know that is a material for an overcast sky but what should we write to define this file? 
> You can read the man page for gensky to get an idea of how the program is typically used. About half way through there is an example of a complete sky description (it starts with "!gensky 4 1 14"). Compare this with the contents of your sky.rad file and the lines before need to go into the sky.rad file. This may only be the "!gensky ..." line or this line and the following "skyfunc ..." definition. 
> When you use this now in a scene you first add the sky_overcast.mat and then the sky.rad file to an oconv command line to compile the octree for the scene. When you want to use the same scene under different sky conditions you only need to replace the sky_overcast.mat file with another one which contains a different "!gensky ..." command to create an intermediate or sunny sky. 
> Regards,Thomas 

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