On Tue, 30 May 2006, Sylvain Moreau wrote:
- 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.
When I do this I tend to find that the lightsource is not bright enough,
and the rest of the ambient is too bright (because it brightens the
ambient more than it does the lightsource relative to the original values
in the real world.
As a fix for this I have used a floating point app (like fusion) to either
paint, or just push the area of the image that is the lightsource to be
MUCH brighter (like 10 on a scale of 0-1 for normal values, even higher
for the sun). Of course you convert your image to floating point in doing
this.
I don't find the chrome ball to be all that tough. It can, however, take a
little time. (I can usually do one on-set is about 3-4 mins, for both
angles).
--
Joe Laffey | Visual Effects for Film and Video
LAFFEY Computer Imaging | -------------------------------------
St. Louis, MO | Show Reel http://LAFFEY.tv/?e01263
USA | -------------------------------------
. | -*- Digital Fusion Plugins -*-
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