SharkD schrieb:
> clipka wrote:
>>   sqrt(
>>     Sqr( F(x-D,y,z) + F(x+D,y,z) - 2*F(x,y,z) ) // squared curvature X
>>     Sqr( F(x,y-D,z) + F(x,y-D,z) - 2*F(x,y,z) ) // squared curvature Y
>>   )
> 
> Also, there's supposed to be an operator between the first and second 
> instances of the function "Sqr". Which operator is it?

Oops, sorry - should be "+".

The idea behind it is that each terms inside the Sqr() computes the 
curvature in a particular dimension; if you interpret that as a vector, 
the sqrt(Sqr()+Sqr()) computes the "absolute" of the curvature.

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