[Radiance-general] genBSDF error

[Greg Ward]

Hello Islam,

As Germán points out, it is difficult to pinpoint your problem based on a compiled, older version of genBSDF.  However, I can guess the cause based on your input.  Normally, a sample surface should be laying in the Z-plane, but you have put yours in the X-plane.  Furthermore, your system has essentially zero thickness.  There is a line in genBSDF where it divides by the X and Y dimensions, which should never be zero, but the width in X is zero in your case.

Beyond that, I should point out that it is neither necessary nor recommended to create an XML file to describe a pane of clear glass.  Even the tensor tree format has difficulty representing perfectly specular systems such as this, and in fact all the default algorithms in WINDOW6 and Radiance work quite well with a more exact description.  Can you explain why you even think you need to do this?

Cheers,
-Greg

> From: Germán Molina Larrain <gmolina1 at uc.cl>
> Date: September 30, 2013 7:16:06 AM PDT
> 
> Islam, 
> 
> I checked line 158 and it seems to be different from yours. Could you post yours here? It should be in ray/src/util/genBSDF.pl
> 
> THANKS
> 
> German
> 
> 
> 2013/9/30 Islam Mashaly <islam.akm at hotmail.com>
> Hello,
> 
> I'm new to the radiance thing so my question might seem an easy one.
> 
> I tried generating an .xml file for a window.rad file containing the following:
> ****************************************************
> void glass windowglass
> 0
> 0
> 3 .1 .1 .1
> 
> windowglass polygon window
> 0
> 0
> 12
> 0     .625      -1.375
> 0     1.375     -1.375
> 0     1.375     -.625
> 0     .625      -.625
> ****************************************************
> And in the genBSDF file I used the following command:
> 
> ****************************************************
> genBSDF.exe srcwindow.rad > srcwindowbsdf.xml
> ****************************************************
> 
> however I get the following error:
> 
> ***************************************************
> Illegal division by zero at script/genBSDF.pl line 158.
> ***************************************************
> 
> I tried looking any forums related to this error but I couldn't find any.
> 
> I would be grateful if anyone can guide me through the process of creating a genBSDF.xml file and adding it as a material.
> 
> Regards.
> 
> Islam Mashaly.
> 
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