vtk计算Polydata的面积和体积

主要利用vtkMassProperties。注意：因为只能处理三角面片 的polydata，需要在pipline中前置vtkTriangleFilter，将polydata转换成tiangle mesh的polydata才能接vtkMassProperties。
vtkTriangleFilter triF= new vtkTriangleFilter();
triF.SetInput(ClipData.GetOutput());

vtkMassProperties polygonProperties = new vtkMassProperties();
polygonProperties.SetInput(triF.GetOutput());
polygonProperties.Update();
double area = polygonProperties.GetSurfaceArea();
double vol = polygonProperties.GetVolume();

MessageBox.Show("Data area is:" +area.ToString() +"/nData volume is: "+ vol.ToString());
polygonProperties.Dispose();
triF.Dispose();