[Radiance-general] test file

[Hu,Jia]

Hello Andy:

Sorry for my late reply. I am new for Radiance and have to learn more to
reply you.  Before discussing the previous question,   could I ask how I
can open the text editor and save as file with extension like .rad after I
install Ubuntu 9.10 because I am unfamiliar with Ubuntu (Linux)?

For the question in my last email, I asked that because someone did some
simulations before but the results seems weird.  In those simulations,  two
identical small offices are developed with only one difference. In one
office, the angles of the blinds are 0 degree. For another, the windows
are separated into three sections (the height for each section is the
same). The blinds with 0 degree are  also the same for each section.  The
illuminance of the sensor points are calculated for the two
offices. Theoretically, the illuminance should be identical or quite
similar. But as I said in my last email, the illuminance shows  a big
difference.

In addition to your explanation, is that right another possible reason is
the computer hardware difference. For example, one computer may calculate
5+3=8, while another calculates 5+3=7.8888.  If possible,  Is there any test
file to test the accuracy of computer before running Radiance?

Thanks.

Jia



On Thu, Jan 14, 2010 at 2:36 PM, Andrew McNeil <andrew.mcneil at arup.com>wrote:

> Jia,
>
> There will always be some difference between two identical simulations in
> Radiance.  The monte carlo sampling method used by radiance is like rolling
> the dice several times.  If your sample density is high enough your results
> for identical simulations will exhibit minor differences.  However with a
> low sampling density a few lucky hits or misses can skew the simulation
> results significantly.
>
> The radiance simulation parameters allow us to adjust the sampling density
> and other parameters to improve the correlation of the results.  Trouble is
> there is no single set of parameter settings that works for every model.
>
> To allow the group to best help you refine your simulation parameters you
> should send the following:
> 1 – The radiance commands you used to run your simulation.
> 2 – The results of your simulations.
> 3 – A description of your model
> 4 – A rendering if you have one (proper etiquette is to upload the image to
> a website and include a link in your email to the list).
>
> Best,
> Andy
>
>
>
> On 1/14/10 11:01 AM, "Hu,Jia" <hujia06 at gmail.com> wrote:
>
>   Hello all:
>
> I use radiance to simulate *the same model twice*. But the result (sensor
> point illuminance) is different. Could anyone know the reason?
>
> Thank you in advance,
>
> Jia
>
>
>
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