In article <mat### [at] netplexaussieorg>,
 Matthew Pace <mat### [at] lycoscom> wrote:

> So as you know, I am stumbling through the isosurface qualities of POV, 
> when I came across a site where someone used an identifier fn_function 
> to make a pigment modifier (bozo in this case) apply to both a height 
> field and an isosurface.  Can anyone either explain this (as he didnt 
> really) or point me to a place which does?  He used this as a way to 
> make some pretty nifty landscapes, so if anyone knows of a site which 
> shows some isosurface landscaping tricks, that would be awesome too.  

Those are simply pattern functions defined in functions.inc. As 
expected, they are documented in the functions.inc documentation. You 
can use the same syntax to make your own versions.

-- 
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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