In article <39D### [at] yahoocom>, lem### [at] yahoocom wrote:

> Tori sections is a good idea, but what for a cone?  There I would 
> need cone sections...

To do that you would have to use isosurfaces...fortunately, the function 
to do that shape would be pretty simple and fast rendering, just vary 
the minor radius of a torus function with angle.


> But I've never used/read-about isosurface before, do they have interior?  

They are ordinary solid objects, so they can be used as media containers 
and work fine in CSG.


> Could you send me a picture url that would describe this in a word?

A picture? An isosurface can do nearly every primitive in POV-Ray, and 
many other shapes.
Basically, you supply an equation that gives a value based on xyz 
coordinates. The isosurface is the surface formed by all points where 
your function is equal to a certain threshold value.
There are several tutorials online, but I don't have the URLs handy for 
any of them right now...they would be on the links page at povray.org 
though.


> And is it in the manual of povray, or, where could I get more 
> information about isosurface?

They are not in the official version yet, but they are included in 
MegaPOV, an unofficial version.
http://nathan.kopp.com/patched.htm

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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