from vtk import *
import sys

pts = vtkPoints()
polys = vtkCellArray()
pd = vtkPolyData()
pd.SetPoints(pts)
pd.SetPolys(polys)

pts.InsertNextPoint(250.0,50.0,0.0)
pts.InsertNextPoint(325.0,200.0,0.0)
pts.InsertNextPoint(400.0,50.0,0.0)
pts.InsertNextPoint(250.0,150.0,0.0)
pts.InsertNextPoint(400.0,150.0,0.0)
# define contour
polys.InsertNextCell(5)
polys.InsertCellPoint(0) 
polys.InsertCellPoint(1) 
polys.InsertCellPoint(2) 
polys.InsertCellPoint(3)
polys.InsertCellPoint(4)  

gtf = vtkGLUTesselatorFilter()
gtf.SetInput(pd)
# try these
gtf.SetWindingRuleToPositive()
#gtf.SetWindingRuleToOdd()
#gtf.SetWindingRuleToNonZero()
#gtf.SetWindingRuleToNegative()
#gtf.SetWindingRuleToAbsGEqTwo()
print(gtf)

pdm = vtkPolyDataMapper()
pdm.SetInput(gtf.GetOutput())

actor = vtkActor()  
actor.SetMapper(pdm)
actor.GetProperty().SetColor(0,0,1)

ren = vtkRenderer()
renwin = vtkRenderWindow()
renwin.AddRenderer(ren)
iren = vtkRenderWindowInteractor()
iren.SetRenderWindow(renwin)

ren.AddActor(actor)
ren.SetBackground(1,1,1)
renwin.SetSize(600,600)

iren.Initialize
renwin.Render()
iren.Start()