A recent paper I did on IBL might be interest to some of you:
http://faculty.washington.edu/inanici/Publications/inanici_luekosOct2010.pdf
Best,
Mehlika
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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