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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Andy,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>This should work great. Thanks for the quick reply!<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Nick<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
radiance-general-bounces@radiance-online.org
[mailto:radiance-general-bounces@radiance-online.org] <b>On Behalf Of </b>Andrew
Mcneil<br>
<b>Sent:</b> Wednesday, March 10, 2010 11:53 AM<br>
<b>To:</b> Radiance general discussion<br>
<b>Subject:</b> Re: [Radiance-general] calculating percentages of a given value
in a .dat / .ok file<o:p></o:p></span></p>
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<p class=MsoNormal>Hi Nick,<o:p></o:p></p>
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<p class=MsoNormal>you can use rtrace's -f option to change the output format
from floating point to ascii. (-faa)<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>The conversion from RGB irradiance to illuminance is:<o:p></o:p></p>
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<p class=MsoNormal>179 * ( 0.265*R + 0.670*G + 0.065*B ) <o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>so you can use rcalc to calculate the percentage you desire
like so:<o:p></o:p></p>
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<p class=MsoNormal>rtrace ... | rcalc -e
'ill=($1*0.265+$2*0.670+$3*0.065)*179' -e '$1=ill/300'<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>Best,<o:p></o:p></p>
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<p class=MsoNormal>Andy<o:p></o:p></p>
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<p class=MsoNormal>On Wed, Mar 10, 2010 at 10:22 AM, Nick Hubof <<a
href="mailto:nhubof@gmail.com" target="_blank">nhubof@gmail.com</a>> wrote:<o:p></o:p></p>
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<div><pre><span style='color:black'>Hi,</span><o:p></o:p></pre><pre><span
style='color:black'>I am trying to do a similar process as below email, but with an illuminance plot. </span><o:p></o:p></pre><pre><span
style='color:black'>I would like to know the % above a lighting threshold of 300lux in an illumination grid output from radiance.</span><o:p></o:p></pre><pre><span
style='color:black'> </span><o:p></o:p></pre><pre><span style='color:black'>My office uses Ecotect to build daylight models with 2d analysis grids (.pts). After running radiance the analysis grid is populated into a .dat file that is renamed in the Ecotect Batch to a .ok file.</span><o:p></o:p></pre><pre><span
style='color:black'>The .ok file consists of illumination data by point.</span><o:p></o:p></pre><pre><span
style='color:black'>So when I open the .ok file in a text editor the values are in exponential form, ie.. (1.501146e+000 1.570207e+000 9.277438e-001). </span><o:p></o:p></pre><pre><span
style='color:black'>When viewed in the Ecotect grid this value is 270.316 lux. </span><o:p></o:p></pre><pre><span
style='color:black'> </span><o:p></o:p></pre><pre><span style='color:black'>Is there a way to have rtrace give me that percentage while the batch is running or at least convert the data from exponential form to ‘real’ values?</span><o:p></o:p></pre><pre><span
style='color:black'> </span><o:p></o:p></pre><pre><span style='color:black'>Please let me know what to add to the batch, I assume it will be at the rtrace section or after in the batch:</span><o:p></o:p></pre><pre><span
style='color:black'>rtrace </span><span style='font-size:14.0pt;color:black'>…</span><span
style='font-size:7.0pt;color:black'>rendering settings</span><span
style='font-size:14.0pt;color:black'>…</span><span style='color:black'> gridtest.oct < gridtest.pts > gridtest.dat </span><o:p></o:p></pre><pre><span
style='color:black'>@RENAME gridtest3.dat gridtest3.ok </span><o:p></o:p></pre><pre><span
style='color:black'> </span><o:p></o:p></pre><pre><span style='color:black'>Thanks,</span><o:p></o:p></pre><pre><span
style='color:black'>Nick</span><o:p></o:p></pre><pre><span style='color:black'> </span><o:p></o:p></pre><pre><span
style='color:black'> </span><o:p></o:p></pre><pre><span style='color:black'> </span><o:p></o:p></pre><pre><span
style='color:black'> </span><o:p></o:p></pre><pre><span style='color:black'> </span><o:p></o:p></pre><pre><span
style='color:black'> </span><o:p></o:p></pre><pre><span style='color:black'>From Greg Ward (<i>Mon Oct 20 10:12:17 PDT 2008)_</i></span><o:p></o:p></pre><pre><span
style='color:black'> </span><o:p></o:p></pre><pre><span style='color:black'>And here is one of the many possible standard Radiance tools ways:</span><o:p></o:p></pre><pre><span
style='color:black'> </span><o:p></o:p></pre><pre><span style='color:black'>pvalue -h -H -o -b -df input.pic | rcalc -if -of -e '$1=1;$2=if(179* </span><o:p></o:p></pre><pre><span
style='color:black'>$1-THRESHOLD,1,0)' | total -if2</span><o:p></o:p></pre><pre><span
style='color:black'> </span><o:p></o:p></pre><pre><span style='color:black'>You need to set THRESHOLD to the desired luminance value (in cd/ </span><o:p></o:p></pre><pre><span
style='color:black'>m^2). This will give you two numbers, the ratio of which is the </span><o:p></o:p></pre><pre><span
style='color:black'>percentage you seek. If you want to do it all on the command line, </span><o:p></o:p></pre><pre><span
style='color:black'>you can add:</span><o:p></o:p></pre><pre><span
style='color:black'> </span><o:p></o:p></pre><pre><span style='color:black'> | rcalc -e '$1=100*$2/$1'</span><o:p></o:p></pre><pre><span
style='color:black'> </span><o:p></o:p></pre><pre><span style='color:black'>to the end of the pipe.</span><o:p></o:p></pre><pre><span
style='color:black'> </span><o:p></o:p></pre><pre><span style='color:black'>Best,</span><o:p></o:p></pre><pre><span
style='color:black'>-Greg</span><o:p></o:p></pre><pre><span style='color:black'> </span><o:p></o:p></pre><pre><span
style='color:black'>><i> From: "Marija Velickovic" <<a
href="http://www.radiance-online.org/mailman/listinfo/radiance-general"
target="_blank">maricanis at gmail.com</a>></i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> Date: October 20, 2008 3:42:28 AM PDT</i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> </i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> Hi,</i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> </i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> I suppose you can use some of standard Radiance tools for that, but </i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> here is another way we use.</i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> </i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> In Raddisplay <a
href="http://deluminaelab.com/en/raddisplay_details.html" target="_blank">http://deluminaelab.com/en/raddisplay_details.html</a> </i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> program you can create falsecolor image from your original radiance </i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> image. If you define false color palette with 2 colors - one has </i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> value 0 and another value you want to use as a threshold, and open </i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> Statistiques dialog, you'll have percent for each color in the </i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> tablle. You can also define the palette with more colors, for </i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> various threshold values.</i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> </i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> Hope this helps,</i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> Marija</i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> De Luminae.</i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> </i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> 2008/10/20 Galen Burrell <<a
href="http://www.radiance-online.org/mailman/listinfo/radiance-general"
target="_blank">galenburrell at yahoo.com</a>></i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> Hi All,</i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> I have a radiance .pic with lux values calculated using rpict -i. </i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> Is there a way to calculate the percentage of the pixels that are </i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> at or above a specified value?</i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> Thanks,</i></span><o:p></o:p></pre><pre><span
style='color:black'>><i> Galen</i></span><o:p></o:p></pre><pre><span
style='color:black'>> </span><o:p></o:p></pre>
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