Hi Claus,
The mksource tool is part Radiance which is available from:
http://www.radiance-online.org/
or
http://radsite.lbl.gov/radiance/
If you are not familiar with it, Radiance is a physically based
simulation toolset design for lighting, daylighting and visualization.
The image format used in Radiance is the original HDR image format.
Regards,
-Jack de Valpine
--
# Jack de Valpine
# president
#
# visarc incorporated
# http://www.visarc.com
#
# channeling technology for superior design and construction
On 1/25/2011 2:29 PM, Claus Brøndgaard Madsen wrote:
Hi,
This thread is getting interesting to me as well. I was not aware of the
mksource tool. Any chance I can find some documentation about how it works?
I tested Paul Debevec's Median Cut approach some years back ... Tested it
against another method. The other method demonstrated similar accuracy with
half the directional light sources.
My Ph. D. Student has been trying to fuse HDR images from fisheye images of the
sky (including the sun). We were using HDRshop. Capturing spanned 13 f-stops
and we could not get HDRshop to fuse HDR properly. In the end we gave up.
Do I really need to get a Mac just to fuse proper sky HDRs??
Best
Claus
Sent from my iPod
On 25/01/2011, at 19.59, "Guglielmetti, Robert"<[email protected]>
wrote:
On 1/25/11 11:47 AM, "Christian Bloch"<[email protected]> wrote:
- IBL needs sampling settings beyond insane.
Ultimately, these concentrated light sources are perfect examples of
direct illumination sources. Brute-forcing this through a GI render
pipeline makes little sense. It's much more efficient to represent these
concentrated light sources with actual 3d lights, and in turn limiting
the DR in the environment map. Also gives you more artistic control over
shadows. Some people like to paint out direct light sources completely,
but I prefer blurring them out with the rest of the environment to keep
some ambient contribution (think hazy spill light).
Radiance includes a tool called mksource to address this. Mksource samples
an HDR environment map and creates direct Radiance light sources to
represent bright concentrated regions found in the map, moving much of the
flux to the direct calculation -- more efficient and less artifacts.
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