In article <3f8af3ec$1@news.povray.org>,
 David Burnett <var### [at] ntlworldcom> wrote:

> It's an isosurface using the noise subtracted, from f_r(),
> which is as close to displacement that POV gets.

I'd say true displacement is as close to true displacement as POV gets...
Combining functions in this way isn't really displacement, but you can 
do real displacement by modifying the coordinates given to the function. 
Common examples of this are scaling by dividing the coordinates or 
translation by subtraction. Just use something like:

originalFn(x - xDispFn(x, y, z),
           y - yDispFn(x, y, z),
           z - zDispFn(x, y, z)
)

Warping a function also qualifies as true displacement...
http://news.povray.org/povray.binaries.images/11612/

-- 
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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