VTK/Examples/Python/TriangleCornerVertices

import vtk
from vtk import *
import hybrid
from hybrid import *
 
Points = vtk.vtkPoints()
Vertices = vtk.vtkCellArray()
 
id = Points.InsertNextPoint(1.0, 0.0, 0.0)
Vertices.InsertNextCell(1)
Vertices.InsertCellPoint(id)
id = Points.InsertNextPoint(0.0, 0.0, 0.0)
Vertices.InsertNextCell(1)
Vertices.InsertCellPoint(id)
id = Points.InsertNextPoint(0.0, 1.0, 0.0)
Vertices.InsertNextCell(1)
Vertices.InsertCellPoint(id)
 
polydata = vtk.vtkPolyData()
polydata.SetPoints(Points)
polydata.SetVerts(Vertices)
polydata.Modified()
polydata.Update()
 
writer = vtk.vtkXMLPolyDataWriter();
writer.SetFileName("TriangleVerts.vtp");
writer.SetInput(polydata);
writer.Write();