[vtkusers] logical 'not' for vtkImplicitBoolean

[Andreas St]

Hello,
I still need to get the values outside of a vtkSuperquadric in Java. In this
case the vtkSuperquadric always has toroidal shape.
For vtkQuadric I can simply negate each coefficient but for the
vtkSuperquadric I can't access the coefficients.
I tried to extend the class to change the return values of
"EvaluateFunction" but it seems that this method is never called.

Can anyone give me a hint how to achieve this?


Andreas St wrote:
> 
> Hello VTK users,
> 
> I am using the vtkImplicitBoolean to combine vtkQuadric and
> vtkSuperquadric to a new geometry.
> I need to evaluate logical expressions which I get in text-form. Each
> surface is represented by an index pointing to the corresponding
> vtkImplicitFunction.
> The expressions look like: (1 2):(3 -1)
> (blank means intersection, colon is a union and minus should result in the
> complement of the surface)
> 
> to implement "(3 -1)" it is possible to use the difference-operator, but
> if I had to evaluate "(-3 -1)" for example,
> there is no solution to me.
> Can anyone tell me how to complement a vtkImplicitFuntcion?
> 

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