code: def setTransform(self, T):
          
          if isinstance(T, vtk.vtkMatrix4x4):
              self.SetUserMatrix(T)
          else:
              try:
                  self.SetUserTransform(T)
              except TypeError:
                  colors.printc('~time Error in setTransform(): consider transformPolydata() instead.', c=1)
          return self
docs: Transform actor position and orientation wrt to its polygonal mesh,
          which remains unmodified.