Thanks Greg. I was thinking of a quick and definitely dirty way of transforming
fisheye into panorama, which will make the parsing much easier. I will try both
ways. Obviously, your process will be more precise. As always, your help is
greatly appreciated.
Mehlika
On Sun, 24 Feb 2013, Gregory J. Ward wrote:
Hi Mehlika,
The genskyvec program is designed to work with gendaylit and gensky input,
only. That isn't to say you shouldn't be able to generate an equivalent output
from an HDR capture of the sky dome, but genskyvec isn't going to be much help
with that. You are looking at a manual process until and unless someone gets
around to automating it.
Here are some of the necessary steps:
1) Create a Radiance description of a scene using your captured sky as a
colorpict input with the appropriate fisheye mapping.
2) Extract the $rhcal variable from genskyvec.pl, which defines the Reinhart
sky sampling needed.
3) Assign the MF constant to the desired Reinhart subdivision resolution
(default 4 in genskyvec).
4) Call cnt with the number of sky patches as given by the Rmax constant
defined in $rhcal and the number of samples per patch (16 in genskyvec but you
may need more if you're trying to resolve the sun).
5) Pipe the output of cnt into rcalc and rtrace as done in the $tregcommand
variable in genskyvec.pl.
6) The output of rtrace goes into total to sum patch values together, and this
basically produces your desired vector, minus the ground plane.
7) Insert a ground plane triple at the beginning based on the expected ground
brightness (irradiance times reflectance over pi) and you're done.
-Greg
From: Mehlika Inanici <[email protected]>
Date: February 23, 2013 1:57:48 PM PST
Hi everyone,
Is there a way to run genskyvec with an HDR sky image? If yes, how? I could not
come up with the right solution.
Thanks,
Mehlika
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