[Radiance-general] New stereographic fisheye view

[Axel Jacobs]

Dear all,

Greg was kind enough to leave this announcement to me, since it was me
who has been giving him a hard time over it. Thanks for implementing
this, Greg!

So here we go:

I have the honor to announce a new fisheye view type for Radiance. It
is called the 'stereographic' or 'planispheric' projection. It is
particularly useful for sun path diagrams, as commonly used in
daylighting and overshadowing studies. Yes, it's true: no more messin'
about with .cal files--it's a native implementation. The option to
rvu/rpict/trace is -vts.

I've put together a little comparison of the three fisheye views:
http://luminance.londonmet.ac.uk/pickup/projections.pdf
This will eventually be merged into the Advanced Tutorial, but I don't
have the time for this right now.

If you feel like doing a little exercise with pen and paper (like our
students do), get a sun path diagram from here:
http://luxal.eu/resources/daylighting/sunpath.shtml,

and follow Andrew's the instructions on the SquareOne web site:
http://squ1.org/wiki/Sun-Path/Overshadowing

Good projections to you all

Axel