# ConvexPointSet

VTKExamples/Python/GeometricObjects/ConvexPointSet

### Description¶

vtkConvexPointSet object represents a 3D cell defined by a convex set of points. An example of such a cell is an octant (from an octree). vtkConvexPointSet uses the ordered triangulations approach vtkOrderedTriangulator) to create triangulations guaranteed to be compatible across shared faces.

Other Languages

See (Cxx), (Java)

Question

### Code¶

ConvexPointSet.py

# !/usr/bin/env python
# -*- coding: utf-8 -*-

import vtk

def main():
cps = vtk.vtkConvexPointSet()
points = vtk.vtkPoints()
points.InsertNextPoint(0, 0, 0)
points.InsertNextPoint(1, 0, 0)
points.InsertNextPoint(1, 1, 0)
points.InsertNextPoint(0, 1, 0)
points.InsertNextPoint(0, 0, 1)
points.InsertNextPoint(1, 0, 1)
points.InsertNextPoint(1, 1, 1)
points.InsertNextPoint(0, 1, 1)
points.InsertNextPoint(0.5, 0, 0)
points.InsertNextPoint(1, 0.5, 0)
points.InsertNextPoint(0.5, 1, 0)
points.InsertNextPoint(0, 0.5, 0)
points.InsertNextPoint(0.5, 0.5, 0)

for i in range(0, 13):
cps.GetPointIds().InsertId(i, i)

ug = vtk.vtkUnstructuredGrid()
ug.Allocate(1, 1)
ug.InsertNextCell(cps.GetCellType(), cps.GetPointIds())
ug.SetPoints(points)

colors = vtk.vtkNamedColors()

mapper = vtk.vtkDataSetMapper()
mapper.SetInputData(ug)

actor = vtk.vtkActor()
actor.SetMapper(mapper)
actor.GetProperty().SetColor(colors.GetColor3d("Tomato"))
actor.GetProperty().SetLineWidth(3)
actor.GetProperty().EdgeVisibilityOn()

# Glyph the points
sphere = vtk.vtkSphereSource()
sphere.SetPhiResolution(21)
sphere.SetThetaResolution(21)

# Create a polydata to store everything in
polyData = vtk.vtkPolyData()
polyData.SetPoints(points)

pointMapper = vtk.vtkGlyph3DMapper()
pointMapper.SetInputData(polyData)
pointMapper.SetSourceConnection(sphere.GetOutputPort())

pointActor = vtk.vtkActor()
pointActor.SetMapper(pointMapper)
pointActor.GetProperty().SetColor(colors.GetColor3d("Peacock"))

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

# Add the actors to the scene
renderer.SetBackground(colors.GetColor3d("Silver"))

renderer.ResetCamera()
renderer.GetActiveCamera().Azimuth(210)
renderer.GetActiveCamera().Elevation(30)
renderer.ResetCameraClippingRange()

# Render and interact
renderWindow.SetSize(640, 480)
renderWindow.Render()
renderWindowInteractor.Start()

if __name__ == '__main__':
main()