[vtkusers] help, I have two technical questions to help.

[l]

Dear expert，
     I want to build implicit surface model of trigonometric function, not vtkQuadric . 
I use the class of vtkImplicitFunction, but I don't know how to express this equation.
    So, I try to rewrite VTK class vtkSphere. I just replace the class name to mySphere, the rest is the same.
But, in the MS VS2010, compile error: 
    error LNK2001:  "__declspec(dllimport) public: static class mySphere * __cdecl mySphere::New(void)" 


    I am very confused, I only modify the name. Is there any missing library?
    
    Please help me about the two questions:
    1) How to express the implicit surface like trigonometric function.
    2)  Modify vtkImplicitFunction class what matters needing attention.


    Thank you very much!
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