in news:5c37498b@news.povray.org clipka wrote:

> As for this particular function, it works as advertised for the default 
> threshold value in isosurfaces (which is what it was designed for). For 
> non-default threshold values it can be argued whether its behaviour is 
> intuitive, but it is what it is.

Then perhaps the documentation should be changed as both doc and include 
file state that the fourth parameter is the sphere's radius and that only 
a value of 1 gives a 'proper' sphere. Maybe even give a function in the 
docs that works like the normal sphere in POV-Ray,

ingo

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