2008

Same scene using depth of field to control focus
The middle apple is clearer than the other two.
To render depth-of-field effects with mental ray, ray tracing (the Ray Trace
toggle) must be enabled on the Render Scene dialog > Renderer panel >
Rendering Algorithms rollout on page 6118 . You must also enable depth of field
for the camera: in the camera's Multi-Pass Effect group, choose “Depth Of
Field (mental ray)” as the depth-of-field type. (If you choose the scanline
renderer's Depth Of Field option, the rendering that results can be out of
focus.)
The mental ray renderer uses the camera’s target distance and f-Stop parameters
to control the depth-of-field effect.
The camera's target distance determines the focus plane. The focus plane is
the distance from the camera at which the scene is completely in focus.
6062 | Chapter 18 Rendering