In article <3e21c8b9@news.povray.org>,
 "James Taylor" <jim### [at] blueyondercouk> wrote:

> Which raises another question  - how is the heightfield mapped onto a
> cyinder and sphere in the HF_* macros? take the cylinder{0,y} where does the
> mapping start?

The macros take a function and pass it the actual vertices, and use 
return value as the displacement amount. Things like spherical or 
cylinderical mapping from this are pretty easy, there are functions 
provided for it.

-- 
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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