Warp wrote:
> 
>   I just noticed that HDR images can be used for creating heightfields.
> This opens an entire new world of extremely high-definition heightfields,
> with much better definition than even a 16-bit PNG heightfield.

Actually not - the resolution is just non-uniform (i.e. near zero height 
you have a much finer resolution than at higher values).  With EXR files 
with 32bit values you will indeed have a higher accuracy though.

And note that heightfields AFAIK are bounded by box { 0, 1 } - using 
high dynamic range there will result in clipping.

As a side note: The necessity for a more than 16bit resolution is quite 
rare for heightfields since a high vertical resolution is usually only 
necessary in combination with a high horizontal resolution (and a 
heightfield of about 2^16 pixel horizontal size will use quite 
exorbitant amounts of memory).

Christoph

-- 
POV-Ray tutorials, include files, Landscape of the week:
http://www.tu-bs.de/~y0013390/ (Last updated 24 Jul. 2005)
MegaPOV with mechanics simulation: http://megapov.inetart.net/

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