# Tetrahedron

VTKExamples/Python/GeometricObjects/Tetrahedron

### Code

Tetrahedron.py

    #!/usr/bin/env python

    import vtk

    def main():
        colors = vtk.vtkNamedColors()

        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)
        actor1.GetProperty().SetColor(colors.GetColor3d("Cyan"))

        # 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)
        actor2.GetProperty().SetColor(colors.GetColor3d("Yellow"))

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

        # Add the actor to the scene
        renderer.AddActor(actor1)
        renderer.AddActor(actor2)
        renderer.SetBackground(colors.GetColor3d("DarkGreen"))
        renderer.ResetCamera()
        renderer.GetActiveCamera().Azimuth(-10)
        renderer.GetActiveCamera().Elevation(-20)

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

    if __name__ == '__main__':
        main()