Tetrahedron
vtk-examples/Python/GeometricObjects/Tetrahedron
Description¶
Tetrahedron. The tetrahedron is a primary three-dimensional cell. The tetrahedron is defined by a list of four nonplanar points. The tetrahedron has six edges and four triangular faces.
Question
If you have a question about this example, please use the VTK Discourse Forum
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(2, 2, 2)
points.InsertNextPoint(3, 2, 2)
points.InsertNextPoint(3, 3, 2)
points.InsertNextPoint(2, 3, 3)
# 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")
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()