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%  This example creates a polygonal model of a cone, and then renders it to
%  the screen. It will rotate the cone 360 degrees and then exit. The basic
%  setup of source -> mapper -> actor -> renderer -> renderwindow is 
%  typical of most VTK programs.

%  First we include the VTK Python packages that will make available 
%  all of the VTK commands to Python.

%  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 = 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 souece to the input of this mapper.
coneMapper = vtkPolyDataMapper();
coneMapper.SetInput( cone.GetOutput() );

%  Create an actor to represent the cone. The actor orchestrates rendering of
%  the mapper's graphics primitives. An actor also refers to properties via a
%  vtkProperty instance, and includes an internal transformation matrix. We
%  set this actor's mapper to be coneMapper which we created above.
coneActor = vtkActor();
coneActor.SetMapper( coneMapper );

%  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= vtkRenderer();
ren1.AddActor( coneActor );
ren1.SetBackground( 0.1, 0.2, 0.4 );

%  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 = vtkRenderWindow();
renWin.AddRenderer( ren1 );
renWin.SetSize( 300, 300 );

%  now we loop over 360 degreeees and render the cone each time
for i  = 0:360
    ren1.GetActiveCamera().Azimuth( 1 );

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