[Radiance-general] Divide by zero in luminaire model / brightdata

[Gregory J. Ward]

Hi Randolph,

Looking at your files, the problem seems to be the usage of lboxcorr, which specifies in the comment at the beginning of source.cal requires that the impostor geometry be centered at the origin.  The xform command following genbox that someone created does not put the center at the origin.  You can correct for this by either switching the "lboxcorr" to the slightly less-accurate "boxcorr" variable, or adding a transform to your brightdata string arguments (-t 0 0 0.08).  The ies2rad program never outputs "lboxcorr" because of its finicky nature.

Best,
-Greg

> From: Randolph Fritz <rfritz at lbl.gov>
> Date: June 27, 2012 4:48:00 PM PDT
> 
> Thanks!
> 
> The .rad file was edited by the modeler; I've attached the edited files. I've also attached the straight output of ies2rad.
> 
> Randolph
> 
> On Wed, Jun 27, 2012 at 4:26 PM, Greg Ward <gregoryjward at gmail.com> wrote:
> Hi Randolph,
> 
> Can you send me the IES input file and the Radiance scene file produced by ies2rad?  Also, find and send your "source.cal" file from the RAYPATH library location.
> 
> -Greg
> 
> > From: "Randolph M. Fritz" <RFritz at lbl.gov>
> > Date: June 27, 2012 3:51:52 PM PDT
> >
> > I'm getting the following error messages from a luminaire model:
> > rpict: warning - compute error for brightdata "luminaire_pendant3_CB087_dist"
> > rpict: Division by zero
> >
> > I'm going to dig into this further - I didn't build the model, and there may be something really obvious wrong with it - but I was wondering if anyone has seen anything like it, and has any tips.
> > --
> > Randolph M. Fritz
> 
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