In article <39228815.F108998C@my-dejanews.com>, 
gre### [at] my-dejanewscom wrote:

>     1)  int(a)
>     2)  mod(a,b)

The int() and mod() functions are already in POV-Ray, perhaps you mean 
in isosurface functions?


>     3)  a function that gives the true surface min & max extent of a
> blob, not its overly spacious bounding box;

The blob object should probably have better bounding_box calculation, no 
need for a new function. In the meantime, you can do this yourself using 
a macro with trace(), there were some posted a while ago.


>     4)  a function that gives the volume of an isosurface, blob, etc.

Would this really be that useful? I don't know how it would be done...
I suppose you could approximate this in a macro by using eval_pattern 
with the blob or function pattern, by taking a bunch of samples in a 3D 
grid and discarding ones below the threshold value.

-- 
Christopher James Huff - Personal e-mail: chr### [at] yahoocom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://chrishuff.dhs.org/
TAG Web page: http://tag.povray.org/

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