# Tetrahedron

VTKExamples/Python/GeometricObjects/Tetrahedron

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Question

### 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()
mapper1.SetInputData(unstructuredGrid1)

actor1 = vtk.vtkActor()
actor1.SetMapper(mapper1)
actor1.GetProperty().SetColor(colors.GetColor3d("Cyan"))

# Create a mapper and actor
mapper2 = vtk.vtkDataSetMapper()
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")
renderWindowInteractor = vtk.vtkRenderWindowInteractor()
renderWindowInteractor.SetRenderWindow(renderWindow)

# Add the actor to the scene
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()