[Radiance-general] Strange results

[Catarina Araújo]

Hi Lars,

Thank you very much.
Yes, after analyzing my results I also think that I have a problem with the
skylight but I can not understand where...

I have already think to use the Radiance. Daysim is not good for me because
I also want to simulate artificial light. I read somewhere that I can
insert my model in use Autodesk Ecotect Analysis software and the export it
and simulate with the Radiance. Is this right?

However I am not sure if it is free?
Where can I download it?

Best regards,
Catarina

2013/2/22 Lars O. Grobe <grobe at gmx.net>

> Hi Catarina!
>
>  My name is Catarina and I am trying to perform a lightning simulation
>> with Desktop Radiance.
>>
> As far as I know, Desktop Radiance has not been supported for several
> year. This list is on Radiance, which shares some underlying code with the
> old Desktop Radiance, but has seen continous development over the years. I
> suggest that you stop using Desktop Radiance and either go with "pure"
> Radiance (which means to get into touch with the command-line tools
> Radiance is made of) or one of the various frontends. Daysim, Relux, the
> Blender-Integration as well as several integrations in more general
> building simulation systems are among the options in the latter case.
>
>  I think I followed all the necessary steps to insert my model:
>> - Design the geometry (its a simple cube, with the dimensions 5*5*2.8,
>> and a window);
>> - Attach materials to the surfaces;
>> - Insert the luminaire;
>> - Define a gride (I am using the reference grid simualation);
>> - Define the orientation.
>>
>> After that, I perform the simulation but the results are very high (I
>> obtain values for illuminance around 14000 or higher). Additionally, the
>> lightning distribution around the room does not make sense. I have low
>> values in some points and very high value in other.
>>
> It is almost impossible to give any useful comment here, as we do not know
> the model (geometry), the material properties or the luminaire, plus we
> have unsupported code. From what you wrote, you do not have any daylight in
> your scene - still, the values you observe could indicate that you have a
> sky model that you are not aware of, and measure illuminance where your
> sensor gets hit by direct sunlight.
>
> Still, a very generic hint - if you observe funny results in your
> illuminance simulation, take a "look" using a more "natural" camera setting
> with a luminance calculation. This helps to identify problems in the model
> (missing ceilings, coordinate systems where one would not expect them to be
> located related to the camera, funny overlaps of surfaces, ...). Still -
> Desktop Radiance is for historical interest but not for simulation work any
> more.
>
>  I read something in your site about the optics 5 software. I have already
>> install it and uninstall and the results remain awkward.
>>
> Optics 5 is a tool to find transmission properties of multi-layer
> glazings. You can import these into Radiance - but Optics does not somehow
> interfere with Radiance, and is a separate software.
>
> Cheers, Lars.
>
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-- 
Catarina Araújo
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