5

HUD Controls
The Grow/Shrink HUD consists of two rectangular regions. The first, a rectangle with a
dotted line, represents the original size of the object. The second is a solid rectangle that
represents the relative growth rate, and can be resized by dragging any of the borders.
Enlarge the box to grow the target object, or reduce the box to shrink it. A slider to the
right lets you adjust the scale of the HUD controls, increasing or decreasing the effect
the controls have over the object.
Scale To parameter
Original size
Zoom level of HUD
Motion Path
The Motion Path behavior lets you create a 2D or 3D motion path for an object to follow.
When you first apply the Motion Path behavior, it defaults to an open spline—a straight
line defined by two points at the beginning and end of the motion path. You can also
choose from preset path shapes, such as a closed spline, loop, rectangle, or wave, or use
a shape to define a path. A shape used as the source for a motion path can be animated.
You can modify the motion path in 3D space so an object travels on the path along the
path’s X, Y, and Z axes. For more information, see Adjusting a Motion Path in 3D Space.
The first point on the path is the position of the object in the Canvas at the first frame of
the behavior. Option-click anywhere on the path to add Bezier points, which allow you
to reshape the motion path by creating curves.
401Chapter 9 Using Behaviors