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482 Chapter 5 Using Behaviors
Pole Axis: This parameter becomes available when the X, Y, and Z axes are enabled in
the Include parameter. Because all points are at a fixed distance from the target or
attractor object (the Pole Axis), the object can be visualized on a sphere of all possible
orbits, with the target object at the center of the sphere. The Pole Axis defines the two
points on the sphere that the orbit must pass through. For more information, see this
parameter’s discussion in “Orbit Around” on page 470.
Direction: A pop-up menu that lets you set whether objects move around in a
clockwise or counterclockwise direction.
Related Behaviors
“Attracted To,” “Attractor,” “Drift Attracted To,” “Drift Attractor,” “Orbit Around,” “Spring”
Wind
Apply the Wind behavior to an object to animate its position and move it in a specified
direction. Unlike the Throw behavior, the velocity specified by the Wind behavior is a
continuous force, and its parameters can be keyframed to achieve gradual changes in
speed and direction.
The Wind behavior is better than the Throw behavior when you want to vary the speed
of the object being animated. You can either apply another behavior (such as
Randomize or Ramp) or keyframe the Velocity parameter of the Wind behavior to vary
the speed and direction of the object. You cannot make gradual changes in either
speed or direction with the Throw behavior.
HUD Control
Note: The HUD lets you specify the direction and speed of the Wind behavior by
dragging an arrow within a circular region. The direction of the arrow defines the
direction of movement in X and Y space, and the length of the arrow defines speed
(velocity). A slider to the right lets you adjust the scale of the HUD control, increasing or
decreasing the effect the control has over the object.
Press the Shift key while dragging the arrow to constrain it to 45 degree angles. Press
the Command key to change the arrow’s direction without affecting its length.
Controls direction and speed of Wind.
Adjusts scale of the HUD control.