Hi Christoph,

> 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

Thanks a lot, that solves the problem!


Friedrich

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