In article <39ECEEA7.AD8656E5@hotmail.com>, Tor Olav Kristensen 
<tor### [at] hotmailcom> wrote:

> But are there any differences in the possible applications (within 
> iso-surfaces) for the bozo pattern and the noise3d function ?

Well, you can use the color_map of the bozo pigment function to get a 
different range of values...and using noise3d() directly is faster.


> I tried to make the radius of all my iso spheres dependent of the 
> field strength at certain points in space, but MegaPOV complained 
> about not finding a float inside the <> part of the "sphere" 
> statement.
...
> Can you please explain ?   

That portion of the function is parsed once and then the result is 
evaluated multiple times...you can't use isofunctions to control it. The 
same goes for pigment functions...you can't do something like this:
function {pigment {bozo scale Func(x, y, z)}}
One of the more obvious reasons for this is that the syntax for 
functions and the syntax for the rest of the POV-Script can't be used in 
the same place...for example, x, y, and z mean different things, vectors 
don't exist in functions, etc.


> Is there any other way to do this ?

No. Well, yes...you could modify the isosurface code to add a function 
to do what you want, or you could use the eval_pattern() or 
eval_pigment() functions to control millions of separate objects, but 
that is probably not what you wanted to hear.
There may be some other way to get the same or a similar effect with 
isosurfaces, though. There is very little that is impossible to do with 
an isosurface...

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

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