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Part IV: Materials, Cameras, and Lighting Basics

FIGURE 19.6
Use the Depth of Field Parameters rollout to set the number of passes.

You can select to use the Target Distance (which is the distance to the camera’s target), or you can specify a
separate Focal Depth distance. This location is the point where the camera is in focus. All scene objects closer
and farther from this location are blurred to an extent, depending on their distance from the focal point.

Note
Even Free cameras have a Target Distance. This distance is displayed at the bottom of the Parameters rollout. n
Within the Depth of Field Parameters rollout, you also have the option to display each separate pass in the
Rendered Frame Window with the Display Passes option and to use the camera’s original location for the
first rendering pass by enabling the Use Original Location option.
The Total Passes is the number of times the scene is rendered to produce the effect, and the Sample Radius
is the potential distance that the scene can move during the passes. By moving the scene about the radius
value and re-rendering a pass, the object becomes blurred more away from the focal distance. If you have a
fairly tight scene, the default Radius value does not produce very visible results. Try increasing the Sample
Radius value and re-rendering. Figure 19.7 shows a scene with Sample Radius values of 1 and 5.

FIGURE 19.7
Changing the Sample Radius value changes the amount of blur added to the scene.

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