Sphere
VTKExamples/Python/Implicit/Sphere
Description¶
Shows how to create a surface representing a sphere by creating an implicit sphere, sampling the implicit function, and finally contouring the sampled data to produce the surface.
Code¶
Sphere.py
import vtk sphere = vtk.vtkSphere() sphere.SetCenter(0, 0, 0) sphere.SetRadius(0.5) # The sample function generates a distance function from the implicit # function. This is then contoured to get a polygonal surface. sample = vtk.vtkSampleFunction() sample.SetImplicitFunction(sphere) sample.SetModelBounds(-.5, .5, -.5, .5, -.5, .5) sample.SetSampleDimensions(20, 20, 20) sample.ComputeNormalsOff() # contour surface = vtk.vtkContourFilter() surface.SetInputConnection(sample.GetOutputPort()) surface.SetValue(0, 0.0) # mapper mapper = vtk.vtkPolyDataMapper() mapper.SetInputConnection(surface.GetOutputPort()) mapper.ScalarVisibilityOff() actor = vtk.vtkActor() actor.SetMapper(mapper) actor.GetProperty().EdgeVisibilityOn() actor.GetProperty().SetEdgeColor(.2, .2, .5) # A renderer and render window renderer = vtk.vtkRenderer() renderer.SetBackground(1, 1, 1) # add the actor renderer.AddActor(actor) # render window renwin = vtk.vtkRenderWindow() renwin.AddRenderer(renderer) # An interactor interactor = vtk.vtkRenderWindowInteractor() interactor.SetRenderWindow(renwin) # Start interactor.Initialize() interactor.Start()