In article <web.3d81e4c1feedefd415e7f0160@news.povray.org>,
 "Alex" <ale### [at] alphacit> wrote:

> I was trying to immerse a somewhat reflective object in an actual ambient (a
> fisheye photograph, taken outdoors on sunny day) and I could't get the
> dynamic range right, due to the sun. Then I fished an old copy of Radiance
> and took out the code for fp images. I ended using an ad-hoc solution,
> using a shared exponent for three mantissas (1 normalized and 2
> denormalized) which worked quite well. The discussion about a floating
> point rep for color components reminded me of the thing and, trying to
> recover the algorithms for fp colors, I stumbled on SGI's LogLuv color
> encoding
> (http://positron.cs.berkeley.edu/~gwlarson/pixformat/tiffluv.html), which
> is far better.

Hmm, thanks for the link, it looks interesting.


> Why not?
> I mean why environment mapping wouldn't be useful?

Because there is a better way already implemented?
What use is environment mapping when you already have true reflection?


> I suspect that we didn't properly understand each other (surely my fault,
> I'm browsing the newsgroups while I'm working and COBOL do things to your
> brains after a while).

Ouch...you have my sympathy.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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