- Take one picture with a fisheye lens (put the camera on the flloor looking
up, use the timer and run as far as you can...)
- In XSI connect that pic to a "mix 2 colors" node and multiply by a high
value (2 to 10)
You get HDR and the real light data from the set in a few sec, I tried, it
works. The fisheye will cut half of the lighting data (no floor). The 8 bit
pic multiplied by 10 will not be very accurate and you may get banding in
reflective objects but this is a real shortcut, it will give you 90% of the
effect for 10% of the cost.
syl
----- Original Message -----
From: "Joe Laffey" <joe(at)laffey.tv>
To: <XSI(at)Softimage.COM>
Sent: Tuesday, May 30, 2006 3:56 PM
Subject: RE: Unwrapping chrome ball pictures...
On Tue, 30 May 2006, Martin Belleau wrote:
I see the difference when I polar coord it, in XSI I simply rotated 90
degrees in X (in environment node) Its far from perfect, but great for my
reflections. I'm also aware that I'll need to do this for all exposures
before combining into HDR.
Ultimately I want to try using a fish eye lens instead of a chrome
ball...
putting the camera face up on the floor and taking a picture, then
re-slapping that on a hemisphere. Anyone have any experience using a fish
eye lens for this?
I have heard of some VFX guys using 2 shots from a 180deg fisheye lens.
But we use a chrome ball and shoot it from two angles, 90 deg opposed (a
la Dubevec). We get excellent results with this technique. Since you have
to shoot two angles either way (and a full bracket of exposures to get
HDR) I am not sure how the fisheye would save you time. I supposed you
wouldn't also have to mount the ball on a stand, and perhaps you could get
it into smaller areas, like larger miniatures.
Let us know what you are trying to achieve and maybe we can brainstorm
some stuff together. I am always open to new ideas that will keep the ADs
from screaming that the chrome ball takes too long ;-)
--
Joe Laffey | Visual Effects for Film and Video
LAFFEY Computer Imaging | -------------------------------------
St. Louis, MO | Show Reel http://LAFFEY.tv/?e01255
USA | -------------------------------------
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