text: from vtk import vtkXMLPolyDataWriter
  from ..shapes import Shape
  
  
  def exportVTP(
      shape: Shape, fname: str, tolerance: float = 0.1, angularTolerance: float = 0.1
  ):
  
      writer = vtkXMLPolyDataWriter()
      writer.SetFileName(fname)
      writer.SetInputData(shape.toVtkPolyData(tolerance, angularTolerance))
      writer.Write()
  
  
  def toString(
      shape: Shape, tolerance: float = 1e-3, angularTolerance: float = 0.1
  ) -> str:
  
      writer = vtkXMLPolyDataWriter()
      writer.SetWriteToOutputString(True)
      writer.SetInputData(shape.toVtkPolyData(tolerance, angularTolerance))
      writer.Write()
  
      return writer.GetOutputString()
  