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?

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