[Radiance-general] GenCumulativeSky compiled for Mac?

[Ji Zhang]

Hi, Rob and the list, a small follow-up question:

I was testing GenCumulativeSky.exe to get the* annual "global horizontal
radiation"* for *a single unobstructed upward sensor*.

The results is* *always *SMALLER or LOWER *than the *SUM of the "global
horizontal radiation" column in the epw file*. (For London.epw, up to 2.7%
lower; for Paris.epw, up to 1.73% lower, for Singapore.epw, up to 1.5%
lower ...)

May I ask:
1) Is the difference in this kind of magnitude acceptable?
2) is the difference related to the parameters for rtrace (I assume not, as
the sensor is unobstructed and the scene is empty...)?

Thanks!
-Ji

On Thu, Dec 13, 2012 at 2:15 AM, Guglielmetti, Robert <
Robert.Guglielmetti at nrel.gov> wrote:

> --------
> WARNING: At least one of the links in the message below goes to an .exe
> file,
> which could be malicious. To learn how to protect yourself, please go here:
> http://www.lbl.gov/cyber/services/suspicious-links.html
> --------
>
> Hi Ji,
>
> Thanks for the link, I grabbed the source and right in the readme was a
> suggested compiler command:
>
> "g++ -D_XOPEN_SOURCE *.cpp -lm -o gencumulativesky"
>
> The above command worked a treat on my dilapidated Mac Pro (still running
> 10.6). The command expects a specifically-formatted weather file which I do
> not have on hand, so I couldn't test it aside from calling the command with
> no input and getting the help, but that did work. The only thing to
> remember is to set the permissions to make it executable on your system
> (e.g. "chmod 775 gencumulativesky").
>
> P.S.
> Christoph also mentions gencumulativesky in his (excellent) daylighting
> chapter in this fairly awesome book:
>
> http://www.amazon.com/Building-Performance-Simulation-Design-Operation/dp/0415474140
>
>
> Rob Guglielmetti
> National Renewable Energy Laboratory (NREL)
> Commercial Buildings Research Group
> 15013 Denver West Parkway MS:RSF202
> Golden, CO 80401
> 303.275.4319
> robert.guglielmetti at nrel.gov
>
>
>
> On 12/12/12 10:35 AM, "Ji Zhang" <hope.zh at gmail.com<mailto:
> hope.zh at gmail.com>> wrote:
>
> Hi, Rob, many thanks for your reply!
>
> The source code of GenCumulativeSky can be found at: (including a short
> guide prepared by Darren)
>
> https://documents.epfl.ch/groups/u/ur/urbansimulation/www/GenCumSky/GenCumSky.zip
>
> ... the download link is mentioned in one of the chapters in the book
> edited by Darren:
> Robinson, Darren (Ed.). (2011). Computer modelling for sustainable urban
> design : physical principles, methods and applications. London ;
> Washington, DC: Earthscan.
>
> It seems Prof Christoph Reinhart in MIT has revised the program and added
> some new options, and the updated version is included in the latest DIVA
> installation package, see the discussion at:
> http://diva4rhino.com/forum/topics/gencumulativesky-exe-problem
>
> Would appreciate if you can share the detailed procedures of the
> compilation (for a C/C++ programming rookie)!
>
> Thanks!
> - Ji
>
>
>
>
> On Thu, Dec 13, 2012 at 12:59 AM, Guglielmetti, Robert <
> Robert.Guglielmetti at nrel.gov<mailto:Robert.Guglielmetti at nrel.gov>> wrote:
> You don't even need to use the Xcode IDE, you can call the compiler (g++)
> directly if there's a makefile. If you point me to the source code, I can
> give it a whirl.
>
> Rob Guglielmetti
> National Renewable Energy Laboratory (NREL)
> Commercial Buildings Research Group
> 15013 Denver West Parkway MS:RSF202
> Golden, CO 80401
> 303.275.4319<tel:303.275.4319>
> robert.guglielmetti at nrel.gov<mailto:robert.guglielmetti at nrel.gov>
>
>
>
> On 12/12/12 7:52 AM, "Ji Zhang" <hope.zh at gmail.com<mailto:
> hope.zh at gmail.com><mailto:hope.zh at gmail.com<mailto:hope.zh at gmail.com>>>
> wrote:
>
> May I ask if anybody compiled the GenCumulativeSky program created by
> Darren Robinson for Mac OS?
>
> Darren mentioned that the source code of GenCumulativeSky is written in
> C++. I assume we can use Xcode to compile it as an executable program for
> the Mac system. But I don't know how to do it ...
>
> Currently, I have to run GenCumulativeSky in Win7 to generate the sky.cal
> and SunFile.rad file based on the epw file for a given city and use the 2
> files in Mac system with other Radiance program. It's just a little bit
> inconvenient...
>
> Advices are greatly appreciated!
>
> - Ji
>
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