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_updateable_traits_ (('opacity', 'GetOpacity'), ('frontface_culling', 'GetFrontfaceCulling'), ('point_size', 'GetPointSize'), ('specular_color', 'GetSpecularColor')) Each tuple contains a pair of strings like so: This allows the tvtk class to be safely used and alsoĮach tvtk class has an attribute called _updateable_traits_. Object basically calls nd and messenger takes care of Weakrefs so the reference cycle problem does not exist. TVTKBase._init_ tells messenger to call self.update_traits when Use the functionality provided by messenger.py. Reference cycle issue and a huge memory leak. That manages the VTK object, we run into a non-garbage-collectable Thus if cb were the update_traits method of the tvtk class The trouble with this approach is that p now holds a reference toĬb. SetRepresentationToWireframe () vtkOpenGLProperty ModifiedEventĪs can be seen, when the property is modified, the callback is called. AddObserver ( "ModifiedEvent", cb ) 1 > p. Here is an example of a VTK observer callback: That effectively calls TVTKBase.update_traits when the ‘ModifiedEvent’ This is achieved by adding an observer to the VTK object Traits of object are dynamically updated if the underlying VTK object One very important feature of tvtk objects is that any VTK related Object or create a new one and manage the new object.
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The update_traits automatically updates the traits of the tvtkĬlass such that they reflect the state of the underlying VTKĬommon code to change the underlying VTK object when the trait isĪs mentioned above, tvtk classes can either wrap an existing VTK Sets up the event handlers that allow us to listen to any changes TVTKBase._init_ accepts an optional VTK object, that can be Allows one to wrap an existing VTK object or create a new one.