import vtk
# create a rendering window and renderer
ren = vtk.vtkRenderer()
renWin = vtk.vtkRenderWindow()
renWin.AddRenderer(ren)
# create a renderwindowinteractor
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
# create points
points = vtk.vtkPoints()
points.InsertNextPoint(1.0,0.0,0.0)
points.InsertNextPoint(0.0,0.0,0.0)
points.InsertNextPoint(0.0,1.0,0.0)
triangle = vtk.vtkTriangle()
triangle.GetPointIds().SetId(0,0)
triangle.GetPointIds().SetId(1,1)
triangle.GetPointIds().SetId(2,2)
triangles = vtk.vtkCellArray()
triangles.InsertNextCell(triangle)
# polydata object
trianglePolyData = vtk.vtkPolyData()
trianglePolyData.SetPoints( points )
trianglePolyData.SetPolys( triangles )
# mapper
mapper = vtk.vtkPolyDataMapper()
mapper.SetInput(trianglePolyData)
# actor
actor = vtk.vtkActor()
actor.SetMapper(mapper)
# assign actor to the renderer
ren.AddActor(actor)
# enable user interface interactor
iren.Initialize()
renWin.Render()
iren.Start()
