[Radiance-general] Five-Phase Method: invalid results in daylight matrix

[Greg Ward]

Hi Alireza,

We saw an issue in another model where the windows were very small relative to the wall area, such that genklemsamp was missing them in its initial sampling.  The solution is to increase the -c setting (try a factor of 10 more) or using the equivalent rfluxmtx command, which uses a more robust sampling method.

Worth a try....
-Greg

> From: Alireza Hashemloo <alireh at uw.edu>
> Subject: Re: [Radiance-general] Five-Phase Method: invalid results in daylight matrix
> Date: February 24, 2016 10:25:12 AM PST
> 
> Hi Rob,
> 
> Thank you for your response.
> I have checked the orientation of the daylight polygons (exterior window pane) and it matches the given view direction as 0 -1 0. I changed the view direction to 0 1 0 just to see if the results would be any different. But I receive the same daylight matrix file with all values equal to 0.
> 
> Would it be convenient for you if I sent you a Google drive link to my project folder with all the files that you need to run the genklemsamp command and reproduce the error?
> I had also sent a separate post with regards to variations in the commands for generating all-black models in the next steps of the tutorial.
> 
> Thank you,
> Alireza
> 
> On Tue, Feb 16, 2016 at 7:44 AM, Guglielmetti, Robert <Robert.Guglielmetti at nrel.gov> wrote:
> At first (quick) glance, my guess is that your window polygon is oriented backwards. Confirm the window normal faces out, toward the exterior environment and sky, by looking at the vertex order (right hand rule!).
> 
> On 2/15/16, 12:59 AM, "Alireza Hashemloo" <alireh at uw.edu<mailto:alireh at uw.edu>> wrote:
> 
> Hello,
> 
> I have a question about the Example 2 in the five-phase method tutorial (http://www.radiance-online.org/learning/tutorials/fivephasetutorialfiles/Tutorial-FivePhaseMethod_v2.pdf):
> 
> OS: Windows 7 (64-bit)
> Command Line Environment: Git Bash
> 
> Command:
> 
> $ genklemsamp -c 1000 -vd 0 -1 0 objects/glazing_outside_pane.rad | \
> rcontrib -c 1000 -ab 2 -ad 1024 -e MF:1 -f reinhart.cal -b rbin -bn Nrbins -m sky_glow -fa \
> model_daylight_matrix.oct > daylight_matrices/daylight_matrix.dmx
> 
> Issue: the recorded values in the generated daylight_matirx.dmx are all equal to 0 (0.000000e+000)
> 
> I would appreciate if you could help me with possible causes of the invalid results.
> 
> Thank you,
> Alireza
> 
> 
> 
> 
> 
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