In article <4098842d$1@news.povray.org>,
 "Skip Talbot" <sta### [at] uiucedu> wrote:

> Is there a way to use a parametric as a media density?  Trying to make a
> curvey type funnel.

No. Think about what a density pattern *is*: it defines a density value 
over 3D space. Parametric shapes take parameters within a certain range 
and translate them into points on a surface. Implicit functions, such as 
those used by the isosurface shape, define the surface as all points 
where a function is equal to some value. The value of the function is 
defined at (nearly) all points, and can easily be used directly as a 
density value or to determine whether a point is inside an isosurface.

You could use parametric functions to generate a density file, and in 
some cases you could convert the parametrics into implicit form, but as 
a general rule, the idea of using parametrics as media densities just 
doesn't make sense.

-- 
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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