[vtkusers] How do I set if I want set cylinder's height 6 millimeter?

[kitti koonsanit]

What is unit of  SetHeight(6.0);  ?
>From Example For code
  cylinder = new vtkCylinderSource();
  cylinder.SetRadius(1);
  cylinder.SetHeight(6.0);

 Question
    Cylinder have 6.0  ______ .
                  A.millimeter
                  B.centrimeter
                  C. meter
                  D. voxel
                  E. other...

thank you very much
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