Isosurface Generation Using VTK




VTK Basics



3.4. Actor and Rendering Objects


Actor objects essentially indicate to a rendering object that there is an object in a scene that must be displayed (well, even if it is transparent).  Since this tutorial is keeping things fairly simple, only two types of actor objects will be considered— vtkActor and vtkLODActor.  The object named vtkActor simply puts an object into the scene and allows the programmer to get and set properties of the object.  vtkLODActor is a special type of vtkActor that permits the graphical object to been displayed in multiple levels of detail.


The rendering objects are important but usually are set up in the same manner from program to program.  There are a handful of settings that can be controlled for these objects, but again, they are usually unnecessary unless a programmer wants to achieve a certain “effect” or “look”.  vtkRenderer is the class that handles the vtkActors and controls the lighting and cameras for the scene.  vtkRenderWindow takes an input of a vtkRenderer and displays the render in a window on the screen.  For information on additional features of these objects, consult the VTK documentation.



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