Gravity – Apple Motion 4 User Manual
Page 507
Gravity
This behavior causes an object, or the objects within a group (when Affect Subobjects is
selected), to fall over time. The gravitational acceleration can be increased or decreased,
resulting in a change to the rate of fall. Objects affected by the Gravity behavior continue
to fall past the bottom edge of the Canvas (unless the Edge Collision behavior has been
applied).
Animation path of an
object pulled down by
the Gravity behavior
The Gravity behavior can be used in conjunction with other behaviors that animate the
position of objects to create natural-looking arcs and animation paths that simulate
thrown objects falling to the ground. For example, apply the Throw behavior to an object
to send it flying through the air, and then apply the Gravity behavior to it to make the
object arc up and then fall down past the bottom of the Canvas.
You can also set the Acceleration parameter to a negative value, effectively applying
“anti-gravity” to the object and making it fly up.
Parameters in the Inspector
Affect Subobjects:
This parameter appears when this behavior is applied to an object
that contains multiple objects, such as a group, a particle emitter, a replicator, or a text
layer. When this checkbox is selected, all objects within the parent object are affected
individually. When this checkbox is deselected, all objects within the parent object are
affected by the behavior together, as if they were a single object.
Acceleration:
A slider defining the strength of gravity affecting the target object. The
higher this value, the faster the target object falls.
HUD Controls
The HUD lets you adjust the Acceleration parameter. When applied to an object containing
multiple objects (such as a group, particles text, or a replicator), the Affect Subobjects
checkbox also appears in the HUD.
Related Behaviors
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507
Chapter 9
Using Behaviors