User`s guide

Applying Additional Shapes
381
Shutter Angle Refers to the workings of a conventional film
camera. Normally the shutter is open 180° meaning
that the shutter is open for half of each frame.
• Increase the angle to open the shutter longer
creating a wider blur.
• Decrease the angle to produce a thinner blur.
The default value of 180 models a typical movie
camera. For the smoothest motion, set Shutter Angle
to 360. You can also overdrive it to create special
effects.
Smoothness menu Determines how many samples are taken between
the time the shutter opens and closes. Increasing the
number of samples creates a smoother blur but
increases preview and render time proportionally.
The choices are:
Low. Uses the fewest samples. At the Low setting,
two snapshots are taken and each increase in
smoothness doubles the number of snapshots.
Medium. Limits Smoothness while working in
Draft mode, so four are the most snapshots
rendered.
High. Takes eight snapshots.
Highest. Uses the most samples.
Parameter Description