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Visibility is determined by accessing the z-buffer of a rendering window.
Associated data attributes are passed to the output as well. The filter refers to a renderer, which is modified every time a render occurs. Therefore, the filter is always out of date, and always executes. You may have to perform two rendering passes, or if you are using this filter in conjunction with vtkLabeledPointMapper, things work out because 2D rendering occurs after the 3D rendering. This method is defined in all subclasses of vtkObject with the vtkTypeMacro found in vtkSetGet.h.