[Radiance-general] HELP

[Thomas Bleicher]

On Wed, Apr 13, 2011 at 12:36 PM, dharam <dharmesh.124 at gmail.com> wrote:

> Hi  all...
>
>
>
> Im trying to do daylight calculations and im in the starting stage of doing
> this... im using ecotect for my modelling and to get daylight results im
> using radiance export options...
>
>
>
> I need help in
>
> -          What al factors to be considered while exporting to
> radiance....
>
Usually Ecotect models are in mm. It's better to convert the units to meters
during the export. There is a conversion factor that should be set to
"0.001".

> -          What all parameters to be checked..lik materials sky conditions
> etc in ecotect
>
The only relevant material information is the reflectance value. To simplify
your life you can use only grey colours where the r,g,b values are identical
to the reflectance.

For a sky you probably want to chose a "CIE overcast sky". However, that
depends on your evaluations. Again, we need to know what you want to do.

> -          The camera...hoe to set it accuarately
>
Just add a camera object. It can be exported as a view specification in
Radiance. Once it is exported you can modify the specification in the
scene.rif file.

> -          The best way to get ouput in radiance.
>
What do you want? Images or grid data? When you set up a grid it will be
exported to a "*.pts" file which can be used in Radiance. Ecotect will also
produce a "*.bat" file with the required Radiance commands.

> -          And how to map down the results from radiance images so tht i
> amy use for comparison and calculations for various cases..
>
If you want illuminance images you have to set the right option during the
export. After that you can use falsecolor.exe or wxfalsecolor (
http://pyrat.googlecode.com/files/wxfalsecolor.exe) to convert the images to
falsecolor images for comparison.


> Its urgent pls help...
>

Oh man! Your screwed ...


> Any link to document where basics of ecotect to radiance is xplained step
> by step wud also be helpful...
>

Start here:

http://wiki.naturalfrequency.com/wiki/Radiance_Daylighting_Tutorial

I think, most of the steps to export to Radiance are explained there. You
still need to have the model "built" correctly, though.

Regards,
Thomas
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