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Tutorial Step4

vtk-examples/Python/Tutorial/Tutorial_Step4


Description

This example demonstrates the creation of multiple actors and the manipulation of their properties and transformations.

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See (Cxx)

Question

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Code

Tutorial_Step4.py

#!/usr/bin/env python

"""
=========================================================================

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/

"""

# First access the VTK module (and any other needed modules) by importing them.
import vtk


def main(argv):
    colors = vtk.vtkNamedColors()

    #
    # Next we create an instance of vtkConeSource and set some of its
    # properties. The instance of vtkConeSource "cone" is part of a
    # visualization pipeline (it is a source process object) it produces data
    # (output type is vtkPolyData) which other filters may process.
    #
    cone = vtk.vtkConeSource()
    cone.SetHeight(3.0)
    cone.SetRadius(1.0)
    cone.SetResolution(10)

    #
    # In this example we terminate the pipeline with a mapper process object.
    # (Intermediate filters such as vtkShrinkPolyData could be inserted in
    # between the source and the mapper.)  We create an instance of
    # vtkPolyDataMapper to map the polygonal data into graphics primitives. We
    # connect the output of the cone source to the input of this mapper.
    #
    coneMapper = vtk.vtkPolyDataMapper()
    coneMapper.SetInputConnection(cone.GetOutputPort())

    #
    # Create an actor to represent the first cone. The actor's properties are
    # modified to give it different surface properties. By default, an actor
    # is create with a property so the GetProperty() method can be used.
    #
    coneActor = vtk.vtkActor()
    coneActor.SetMapper(coneMapper)
    coneActor.GetProperty().SetColor(0.2, 0.63, 0.79)
    coneActor.GetProperty().SetDiffuse(0.7)
    coneActor.GetProperty().SetSpecular(0.4)
    coneActor.GetProperty().SetSpecularPower(20)

    #
    # Create a property and directly manipulate it. Assign it to the
    # second actor.
    #
    property = vtk.vtkProperty()
    property.SetColor(colors.GetColor3d("Tomato"))
    property.SetDiffuse(0.7)
    property.SetSpecular(0.4)
    property.SetSpecularPower(20)

    #
    # Create a second actor and a property. The property is directly
    # manipulated and then assigned to the actor. In this way, a single
    # property can be shared among many actors. Note also that we use the
    # same mapper as the first actor did. This way we avoid duplicating
    # geometry, which may save lots of memory if the geometry is large.
    coneActor2 = vtk.vtkActor()
    coneActor2.SetMapper(coneMapper)
    coneActor2.GetProperty().SetColor(colors.GetColor3d("LightSeaGreen"))
    coneActor2.SetProperty(property)
    coneActor2.SetPosition(0, 2, 0)

    #
    # Create the Renderer and assign actors to it. A renderer is like a
    # viewport. It is part or all of a window on the screen and it is
    # responsible for drawing the actors it has.  We also set the background
    # color here.
    #
    ren1 = vtk.vtkRenderer()
    ren1.AddActor(coneActor)
    ren1.AddActor(coneActor2)
    ren1.SetBackground(colors.GetColor3d("CornflowerBlue"))

    #
    # Finally we create the render window which will show up on the screen.
    # We put our renderer into the render window using AddRenderer. We also
    # set the size to be 300 pixels by 300.
    #
    renWin = vtk.vtkRenderWindow()
    renWin.AddRenderer(ren1)
    renWin.SetSize(300, 300)
    renWin.SetWindowName("Tutorial_Step4")

    #
    # Now we loop over 360 degrees and render the cones each time.
    #
    for i in range(0, 360):  # render the image
        # render the image
        renWin.Render()
        # rotate the active camera by one degree
        ren1.GetActiveCamera().Azimuth(1)


if __name__ == '__main__':
    import sys

    main(sys.argv)