Friedrich Lohmueller wrote:
> I'm having a crash problem with isosurface
> using pov-ray 3.6.1 for windows on windows XP:

Renders without error in all variations using official 3.6.1 here (on Linux)

But note:

>   sqrt(  0.5*x*x + y*y + z*z - 1)

tries to calculate the square root of a negative number for some values 
of x,y and z, the result of this is not defined (and can vary from 
platform to platform - i even get different results with different 
builds here).

You almost certainly want:

sqrt( 0.5*x*x + y*y + z*z ) - 1


Christoph

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