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Depth of Field (DOF) is a photographic technique used to convey scale (s= ize) and areas of interest in a composition.
Clever usage can lead a viewer to certain parts of your image and increa= se photorealism by correctly mimicking a real-world lens.
RenderMan provides controls for realistic and compelling images with dep= th of field. There are also options that are non-physical but great fo= r creating art-directed imagery.
To begin using DOF in Maya you are required to enable it in the camera a= ttributes. Since this is per-camera you should be careful you have it enabl= ed on the render camera.
Using Maya you have a few options to drive your focal plane, or the area= you want to be in focus.
The simplest is to use the Object Details selection in Maya to display the selected object's distance from the camer= a. This can be found under the following menu: Display > Heads U= p Display > Object Details
Above you can see that the selected geometry is 63.974 units from the ca= mera. Using this value as the Focus Distance will assure t= his location is in focus and sharp. Maya's Viewport 2.0 will also provide y= ou with a reasonable preview of your choice seen below.
While the above method is simple and useful, many times you find that yo= ur shot has an animated or tracked camera. This means as it changes locatio= n your desired focal plane can move off your target location.
A somewhat more common solution in Maya is to use the Distance T= ool as a Focus Puller for the camera. One end of the tool= becomes a child of the camera while the other can be animated or constrain= ed to another animated object. Your resulting distance result is then conne= cted to the render camera Focus Distance attribute to driv= e your dynamic focal plane. You can now freely move your camera around with= out worry it will lose your desired focal point!
Congratulations! You're now ready to render in RenderMan! Let's go over = some extra features and performance settings used in RenderMan to get you e= xactly what you want!
The next sections will cover controls like Bokeh in Maya shapes and advanced features like