[Radiance-general] visualize position index

[Ji Zhang]

Sorry, the download link should be:
https://sites.google.com/site/episodehopezh/files/viz_pos_index_test.rar?attredirects=0&d=1

Apologize!

- JI


On Mon, Apr 30, 2012 at 2:15 AM, Ji Zhang <hope.zh at gmail.com> 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
>
> The .cal and batch files can be downloaded from:
>
> 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
>
>
>
>
>
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