[vtkusers] How to write my own VTK class?

[菠萝]

Hi, everyone,
     I want to write a class to implement some math functions with VTK. but I don't know how to write it. who can tell me what I should do? or is there any useful information for it?
     best regards. 
     MJ
  
 PS. I know there is a class vtkMath in VTK, but I want to rewrite it and the new class could include my own math functions.
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