[Radiance-general] rtcontrib & daylight coefficients

[Iain Macdonald]

Greg et all,

I've done a few more tests and with -ad set to 10000 and -lw set to 
0.0001 the results are much more consistent (and all previous issues are 
no longer applicable).  This seems a bit extreme but it works.

Iain

Gregory J. Ward wrote:

> Hi Iain,
>
> I'm not sure what your rtcontrib command was as you didn't include it  
> in your e-mail, but you can expect a degree of randomness in the  
> results as you would see in any Monte Carlo calculation.  Try  
> increasing -ad and decreasing the -lw value to see if you get  
> convergence.
>
> -Greg
>
>> From: Iain Macdonald <iain at esru.strath.ac.uk>
>> Date: September 30, 2005 9:14:33 AM PDT
>>
>> Greg,
>>
>> I'm now using version 1.28 of rtcontrib and its much better, but  
>> still not 100% I think.  Here is my model:
>> # gensky 4 2 10.00 +s -g 0.25 -a 51.7 -o -0.5 -m -0.5
>> # Local solar time: 9.94
>> # Solar altitude and azimuth: 36.2 -39.4
>> # Ground ambient level: 16.6
>>
>> void light solar
>> 0
>> 0
>> 3 6.47e+06 6.47e+06 6.47e+06
>>
>> solar source sun
>> 0
>> 0
>> 4 0.512417 -0.623930 0.590034 0.5
>>
>> void brightfunc skyfunc
>> 2 skybr skybright.cal
>> 0
>> 7 1 8.98e+00 2.24e+01 4.56e-01 0.512417 -0.623930 0.590034
>>
>> skyfunc glow sky_glow
>> 0 0 4 .986 .986 1.202  0
>> sky_glow source sky
>> 0 0 4 0 0 1 180 # define ground...
>> skyfunc glow ground_glow
>> 0 0 4 1.276 .957 .319  0
>> ground_glow source ground
>> 0 0 4 0 0 -1 180
>> Which is about as simple as you can get I think ;-)
>>
>> rtcontrib command as below with the following test points (in  
>> test.dat):
>> 0 0 1 0 1 0
>> 0 0 1 0 -1 0
>> 0 0 1 0 -1 0
>> 0 0 1 0 1 0
>>
>> I would expect to get the same data for point one and four and for  
>> points two and three.  However the data for the last few points is  
>> (I've transposed the numbers and the data in the first column is  the 
>> field from the rtcontrib output):
>> 421 7.479982e-03 0.000000e+00 0.000000e+00 4.986655e-03       422  
>> 7.479982e-03 0.000000e+00 0.000000e+00 4.986655e-03       423  
>> 7.479982e-03 0.000000e+00 0.000000e+00 4.986655e-03       424  
>> 0.000000e+00 2.493327e-03 2.493327e-03 0.000000e+00       425  
>> 0.000000e+00 2.493327e-03 2.493327e-03 0.000000e+00       426  
>> 0.000000e+00 2.493327e-03 2.493327e-03 0.000000e+00       427  
>> 0.000000e+00 1.246664e-02 1.246664e-02 0.000000e+00   428 0.000000e 
>> +00 1.246664e-02 1.246664e-02 0.000000e+00       429 0.000000e+00  
>> 1.246664e-02 1.246664e-02 0.000000e+00       430 0.000000e+00  
>> 4.986655e-03 2.493327e-03 0.000000e+00       431 0.000000e+00  
>> 4.986655e-03 2.493327e-03 0.000000e+00       432 0.000000e+00  
>> 4.986655e-03 2.493327e-03 0.000000e+00       433 4.986655e-03  
>> 0.000000e+00 0.000000e+00 4.986655e-03       434 4.986655e-03  
>> 0.000000e+00 0.000000e+00 4.986655e-03   435 4.986655e-03 0.000000e 
>> +00 0.000000e+00 4.986655e-03       436 2.493327e-03 0.000000e+00  
>> 2.493327e-03 2.493327e-03       437 2.493327e-03 0.000000e+00  
>> 2.493327e-03 2.493327e-03       438 2.493327e-03 0.000000e+00  
>> 2.493327e-03 2.493327e-03
>> First of all do you get the same results?  Or am I doing something  
>> wrong.
>>
>> regards,
>>
>> Iain
>>
>
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-- 
****************************
Dr Iain A Macdonald
Energy Systems Research Unit
University of Strathclyde
Glasgow, UK
+44 141 548 3747
http://www.esru.strath.ac.uk
****************************