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Actually, now that you mention it, I don't know that I've ever generated
a 32-bit reflection map from scene geometry. I have taken existing
reflection maps and blurred them using shaders and texture baking to
allow for optimized convergence in shaders that multi-sample the
environment (since just blurring a reflection map typically produces
uneven blur). I guess to do a straight-up reflection map, I would
probably just throw a reflection shader on a sphere and rendermap to a
spherical projection. I suppose you could do a cubic cross, but AFAIK,
you'd have to do some manual uv'ing or something. I think at one point,
we wrote a script to spherize an object, so you could cubic-project on a
cube, then subdivide a bunch of times and spherize it. So you'd
basically have a perfectly-cubically-divisible sphere. Otherwise, the
edges aren't really in the right place, I think. You could also do a
cubic map by rendering out 90 degree cameras in 6 directions -- I've
done that for quick&dirty GL stuff before.
I think in the past, I've usually gone straight to .map, and then used
the .map files directly, without re-exposing. I don't really see why
you should have to adjust for intensity in a general sense -- do you
have any idea why that is?
-Andy
Tim Leydecker wrote:
Sorry, I´m using *.ct, not *.map. *.ct works.
Convert it using imf_disp.exe from a Maya install.
(XSI one will work the same or better,depends on build).
Cheers
tim
----- Original Message ----- From: "Tim Leydecker" <BauerOink(at)gmx.de>
To: <XSI(at)Softimage.COM>
Sent: Saturday, September 16, 2006 10:11 AM
Subject: Re: Dosch HDRI maps
How do you create your 32bit environmentmaps in xsi?
custom shader? spherical ones or cubics?
I currently bake a 100%reflective sphere to *.map texture
and convert that to a *.hdr/*.exr since it seems using any
other format produces incorrect results in XSI 5.1/5.11
when selected a target for a baking. I think I logged it a bug
allready, at least for *.exr. This approach lacks good
filtering, thought. Also reuqires the resulting file to be
normalized by factor 2 or 4 to get the proper intensity back.
HDRshop is nice to have when comparing actual dynamic
range of source and baked texture for such a matter and
fitting the "intensity" to the former.
Cheers
tim
----- Original Message ----- From: <andy(at)thefront.com>
To: <XSI(at)Softimage.COM>
Sent: Saturday, September 16, 2006 7:26 AM
Subject: Re: Dosch HDRI maps
This is good to know. So, I won't raise my arms and scream if anyone
tries to buy the Extreme High Res ones or the skies (although I will
mention that we already own the skies). I still highly recommend that
others do so if anyone tries to buy "radiant skies" or "industrial
reflections."
The project we're working on right now requires interior lighting. And
actually, we were hoping to relight each shot individually. Does
anyone
have any good tricks for getting nice "soft-box" effects in
reflections? And has anyone used the stuff from HDRI-Studio with any
success? It seems
like what we'd really like to have is just a model of a soft-box with a
proper re-exposable exr texture that I could duplicate and place in a
scene, then generate my own exr environment maps from it (or just
render
it directly).
-Andy
On Fri, September 15, 2006 3:59 pm, Francois Lord wrote:
The Extreme High Res ones are useful when you need an 360 degrees
environment for an SD shot, or when you need very crisp reflections
in HD.
Creating your own HDR image with that quality is quite difficult.
The skies are ok. It's definitely cheaper to buy them than to go
out and
try to get the right sky for the shot you need... for 14 days in a
row.
Kris Rivel wrote:
Well I can only speak on behalf of the "Extreme High Res" and
standard
"Sky" libraries. I found them very useful on several jobs where
creating or shooting our own HDRI was out of the question. If you
have
the time and money though, its worth making your own with a proper
setup. I can highly recommend the guys at EPOP
(http://www.epop.com/).
They use one of those great Spheron cameras
and they created stunning HDRI images for me in the past.
Kris
Andy Jones wrote:
Yeah, I suppose we have too, though we've had just as much luck just
browsing through Turbo Squid. But these exr's, specifically, are
pretty weak, I think.
-Andy
Joe Laffey wrote:
On Thu, 14 Sep 2006, Andy Jones wrote:
This is just an FYI for anyone who doesn't want to waste $125 or
so. This is now the third time one of our project leads has
decided to buy a package of Dosch HDRI environment maps for a
project. We now own skies, radiant skies, and industrial
reflections. Of these, it's really obvious that radiant skies
and industrial reflections are just CG renders of
poorly-constructed environments. In the industrial reflections,
there are, for example, completely black materials (that don't
ever change color no matter what exposure you use). And none of
the interior lighting re-exposes in any sort of reasonable way.
And the clouds
in the radiant skies are really stupid-looking hand-painted
chicken scratches. The regular "skies" package is not as bad, but
I
wouldn't say I'm particularly impressed by it, either. Anyway,
just a heads-up about a lame product. For interiors at least,
just save yourself some money and make your own environment maps
of your scenes... If you don't have a scene, just throw some cubes
in there -- that's all Dosch did.
FWIW, I have gotten some models from Dosch that were more than
adequate for the price. So noth everything they have is lame. BUt,
like anything caveat emptor.
--
Joe Laffey | Visual Effects for Film and Video
LAFFEY Computer Imaging |
-------------------------------------
St. Louis, MO | Show Reel
http://LAFFEY.tv/?e02809
USA |
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