8

Using Transforms to Aim a Camera 1223
With manual clipping on, the near clipping plane
canbeasclosetothecameraas0.1unit.
Wa rn in g : Extremely large Far Clip values can produce
floating-point error, which can cause Z-buffer problems
in the viewport, such as objects appearing in front of
other objects when they shouldn’t.
Conceptual image of Near and Far clipping planes.
Multi-Pass Effec t group
These controls let you assign a depth-of-field or
motion blur effect to the camera. When generated
by a camera, these effects generate blurring by
rendering the scene in multiple passes, with
offsets. They increase rendering time.
Tip: The depth-of-field and motion blur effect s are
mutually exclusive. Because they rely on multiple
rendering passes, applying both to the same
camera could be prohibitively slow. If you want to
use b oth depth-of-field and motion blurring in the
same scene, use multi-pass depth-of-field (using
these camer a parameters) and combine it with
object motion blur (page 3–1075) .
Enable—When on, previewing or rendering uses
the e ffect. When off, the effect is not rendered.
Prev iew—Click to preview the effect in an ac tive
camera view port. This button has no effect if the
active viewport is not a camera view.
Ef fe ct dr op-down li st —Lets you choose which
multi-pass effect to generate,
Depth Of Field (page
2–1228)
or Motion Blur (page 2–1230) .These
effects are mutually exclusive. Default=Depth Of
Field.
This list also lets you choose
Depth of Field
(mental ray) (page 2–1227)
, which lets you use the
mental ray renderer’s depth of field effect.
Note: The rollout for the chosen effect appears, by
default, after the P arameters rollout.
Render Ef fects Per Pas s—When on, applies
rendering effects (page 3–214) , if any are assigned,
to each p ass of the multi-pass effect (depth of field
or motion blur). When off, applies rendering
effects only after the passes that generate the
multi-pass effect. Default=off.
TurningoffRenderEffectsPerPasscanimprove
the render time for multi-pass effects.
Target Distance—With a free camera, sets a point
to use as an invisible target so that you can orbit a
camera around that point. With a target c amera,
indicates the distance between the camera and its
target.
Usi ng Tra nsf or ms to A im a Camer a
You can use transforms to aim a camera and
change its orientation in the scene.
Move (page 1–419) adjusts the position
of the camera object or the position of a
target
camera’s target (page 2–1216)
.
Because the target is displayed as a smal l square,
and because it is often in the same area as objects
that are the subject of the camera, it c an be hard
to select by clicking. Select the camera object,
right-click, then choose Select Target f rom the
Tools 1 (upper-left) quadrant of the quad menu.