In article <3A9E3534.E9A9254F@gmx.de>, Christoph Hormann 
<chr### [at] gmxde> wrote:

> What's wrong about 16 bit greyscale png?
> Just use hf_gray_16 and +fn16.

I'm thinking more of 32-bit (single-precision float). 16-bit gives you 
65536 levels, though, which should be enough for practically 
anything...if you have a 5000 foot tall mountain, the smallest change in 
height you can represent will be about an inch, and you could use a 
"local" height field if you need more precision. (unless I've made an 
error in my calculations...)

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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