Point
vtk-examples/Python/GeometricObjects/Point
Description¶
vtkPoints object represents 3D points. The data model for vtkPoints is an array of vx-vy-vz triplets accessible by (point or cell) id.
Question
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Code¶
Point.py
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import vtk
def main():
colors = vtk.vtkNamedColors()
# Create the geometry of a point (the coordinate)
points = vtk.vtkPoints()
p = [1.0, 2.0, 3.0]
# Create the topology of the point (a vertex)
vertices = vtk.vtkCellArray()
# We need an an array of point id's for InsertNextCell.
pid = [0]
pid[0] = points.InsertNextPoint(p)
vertices.InsertNextCell(1, pid)
# Create a polydata object
point = vtk.vtkPolyData()
# Set the points and vertices we created as the geometry and topology of the polydata
point.SetPoints(points)
point.SetVerts(vertices)
# Visualize
mapper = vtk.vtkPolyDataMapper()
mapper.SetInputData(point)
actor = vtk.vtkActor()
actor.SetMapper(mapper)
actor.GetProperty().SetColor(colors.GetColor3d('Tomato'))
actor.GetProperty().SetPointSize(20)
renderer = vtk.vtkRenderer()
renderWindow = vtk.vtkRenderWindow()
renderWindow.SetWindowName('Point')
renderWindow.AddRenderer(renderer)
renderWindowInteractor = vtk.vtkRenderWindowInteractor()
renderWindowInteractor.SetRenderWindow(renderWindow)
renderer.AddActor(actor)
renderer.SetBackground(colors.GetColor3d('DarkGreen'))
renderWindow.Render()
renderWindowInteractor.Start()
if __name__ == '__main__':
main()