Apple Motion 4 - Manual (Page 214)

The Render Settings tab is divided into two categories: Motion Blur and Reflections. The
Motion Blur controls simulate the effect a camera’s mechanical shutter has on a frame of
film or video when either the camera or its subject is moving. In Motion, motion blur
affects objects in your project that are animated using behaviors or keyframes. This allows
you to create more natural-looking motion in your project, even though the animation
is artificially created. As with a camera, faster objects have more blur, whereas slower
objects have less.
No motion blur Motion blur at 360° Motion blur at 180°
Important: Unlike Final Cut Pro or Final Cut Express, blur created by these parameters
does not affect motion that occurs within a QuickTime movie file or an image sequence.
It only affects animated objects.
The Motion Blur section of the Render Settings tab has two parameters:
Samples: The number of sub-frames rendered per frame, where 1 frame is 360 degrees.
Higher Samples values result in a higher-quality motion blur effect, but are more
processor-intensive. The default Samples value is 8. The maximum possible value is 256.
Shutter Angle: Defines the size of the motion blur that appears for animated objects.
Increasing the shutter angle increases the number of frames over which the shutter is
open.
The following image shows a shape that has been keyframed to move quickly across the
Canvas horizontally.
214 Chapter 6 Creating and Managing Projects