> I've been cleaning up the isosurface tutorial in the docs, mostly image
> formats and some grammar and wording as I come across it ... anyway In
> this section:
>
http://wiki.povray.org/content/Documentation:Tutorial_Section_3.2#Specifying_functions
> I haven't the vaguest idea what this sentence is getting at: "With the
> equation of a sphere x^2+y^2+z^2 = Threshold we get:" ... then code
> example just below it ... threshold Threshold seems ALL wrong to me. The
> threshold keyword expects a float value were as the above equation would
> set Threshold to a vector ... correct? What am I missing here?
>

Here, "Threshold" is a previously declared user variable. It should be a 
float.

The only thing would be to explicitely state that it must be a float.


Alain

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