[Radiance-general] visualize position index

[Ji Zhang]

Dear Dr Wienold, Thank you very much for the advise! will try it later.

- Ji

On Mon, Apr 30, 2012 at 7:12 PM, Jan Wienold
<jan.wienold at ise.fraunhofer.de>wrote:

> Dear Ji,
>
> there is an undocumented option in evalglare (-p), which replaces the
> luminance values to the position-index values. So you can directly generate
> an image just with the position index with just one command line...
> You have to use evalglare in the normal manner (-> feed in image and
> specify output image. The content of the input image doesn't matter, just
> the header options must be correct.)
>
> example: evalglare -p -c position_index.hdr  inputimage.hdr
>
> Good luck,
>
> Jan
>
>
>
> On 04/29/2012 08:15 PM, Ji Zhang wrote:
>
>> Dear Radiance experts,
>>
>> Learning glare related analysis, I write a .cal file to define the
>> position index for every point on the sky in relation to a given view
>> vector based on the position index formula. I also prepared a batch
>> file to visualize it.
>>
>> However, the image I got is not a circular fisheye one and the upper
>> half of the pattern doesn't seem to resemble what appeared on page 753
>> in Dr Wienold and Dr Christoffersen's paper:
>> Wienold, J., & Christoffersen, J. (2006). Evaluation methods and
>> development of a new glare prediction model for daylight environments
>> with the use of CCD cameras. Energy and Buildings, 38(7), 743-757.
>>
>> Images are shown here:
>> http://episode-hopezh.**blogspot.com/2012/04/viz-**position-index.html<http://episode-hopezh.blogspot.com/2012/04/viz-position-index.html>
>>
>> The .cal and batch files can be downloaded from:
>> https://sites.google.com/site/**episodehopezh/files/viz_sg.**
>> rar?attredirects=0&d=1<https://sites.google.com/site/episodehopezh/files/viz_sg.rar?attredirects=0&d=1>
>> <https://sites.google.com/**site/episodehopezh/files/viz_**
>> sg.rar?attredirects=0&d=1<https://sites.google.com/site/episodehopezh/files/viz_sg.rar?attredirects=0&d=1>
>> >
>>
>> Two folders are included, one for visualizing the position index and
>> the other one for visualizing the inverted position index.
>>
>> The view is a horizontal one towards due south. The image extracted
>> from Dr Wienold and Dr Christoffersen's paper is also included as a
>> reference.
>>
>> Can you kindly take a look of the .cal and batch file and advise me on:
>> 1) why I can't get a circular fisheye image (I assume there's simple
>> rookie error in the script...)?
>> 2) whether the position index pattern as visualized is correct?
>> 3) how to convert the image into one using position index value as
>> color legend?
>>
>>
>> Would greatly appreciate if Dr Wienold can kindly provide some
>> suggestions!
>>
>> Thank you very much in advance!
>>
>> - Ji
>>
>>
>>
>>
>>
>
> --
> Dr.-Ing. Jan Wienold
> Head of Team Passive Systems and Daylighting
> Fraunhofer-Institut für Solare Energiesysteme
> Thermal Systems and Buildings
> Heidenhofstr. 2, 79110 Freiburg, Germany
> Phone: +49(0)761 4588 5133 Fax:+49(0)761 4588 9133
> jan.wienold at ise.fraunhofer.de
> http://www.ise.fraunhofer.de
>
> In office:
> Mo,Tue: 8:30-18:00
> We,Thu: 8:30-16:00
> Fr:  8:30-15:30
>
>
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