#!/usr/bin/env python

import vtk

points = vtk.vtkPoints()
points.InsertNextPoint(0, 0, 0)
points.InsertNextPoint(1, 0, 0)
points.InsertNextPoint(1, 1, 0)
points.InsertNextPoint(0, 1, 1)
points.InsertNextPoint(5, 5, 5)
points.InsertNextPoint(6, 5, 5)
points.InsertNextPoint(6, 6, 5)
points.InsertNextPoint(5, 6, 6)

# The first tetrahedron
unstructuredGrid1 = vtk.vtkUnstructuredGrid()
unstructuredGrid1.SetPoints(points)

tetra = vtk.vtkTetra()

tetra.GetPointIds().SetId(0, 0)
tetra.GetPointIds().SetId(1, 1)
tetra.GetPointIds().SetId(2, 2)
tetra.GetPointIds().SetId(3, 3)

cellArray = vtk.vtkCellArray()
cellArray.InsertNextCell(tetra)
unstructuredGrid1.SetCells(vtk.VTK_TETRA, cellArray)

# The second tetrahedron
unstructuredGrid2 = vtk.vtkUnstructuredGrid()
unstructuredGrid2.SetPoints(points)

tetra = vtk.vtkTetra()

tetra.GetPointIds().SetId(0, 4)
tetra.GetPointIds().SetId(1, 5)
tetra.GetPointIds().SetId(2, 6)
tetra.GetPointIds().SetId(3, 7)

cellArray = vtk.vtkCellArray()
cellArray.InsertNextCell(tetra)
unstructuredGrid2.SetCells(vtk.VTK_TETRA, cellArray)

# Create a mapper and actor
mapper1 = vtk.vtkDataSetMapper()
if vtk.VTK_MAJOR_VERSION <= 5:
    mapper1.SetInputConnection(unstructuredGrid1.GetProducerPort())
else:
    mapper1.SetInputData(unstructuredGrid1)

actor1 = vtk.vtkActor()
actor1.SetMapper(mapper1)

# Create a mapper and actor
mapper2 = vtk.vtkDataSetMapper()
if vtk.VTK_MAJOR_VERSION <= 5:
    mapper2.SetInputConnection(unstructuredGrid2.GetProducerPort())
else:
    mapper2.SetInputData(unstructuredGrid2)

actor2 = vtk.vtkActor()
actor2.SetMapper(mapper2)

# Create a renderer, render window, and interactor
renderer = vtk.vtkRenderer()
renderWindow = vtk.vtkRenderWindow()
renderWindow.AddRenderer(renderer)
renderWindowInteractor = vtk.vtkRenderWindowInteractor()
renderWindowInteractor.SetRenderWindow(renderWindow)

# Add the actor to the scene
renderer.AddActor(actor1)
renderer.AddActor(actor2)
renderer.SetBackground(.3, .6, .3)  # Background color green

# Render and interact
renderWindow.Render()
renderWindowInteractor.Start()
