5

Link
The Link parameter behavior forces the value of one parameter to match that of another
“linked” parameter. The source behavior can be within the same object or from another
object. The linked parameters must contain numerical data. Parameters controlled by
checkboxes, menus, and other non-numeric values cannot be linked. The linked parameters
also must contain the same number of attributes. You cannot link a compound parameter
such as Scale X-Y-Z to a parameter such as Opacity which has only one slider. You can
however, link a compound parameter such as Scale X-Y-Z to Position X-Y-Z.
The values of the source parameter can be scaled to more accurately apply to the
destination parameter. For example, a source parameter with a range of 1–100 can be
scaled when applied to a parameter with a range of 0–1. The values can also be offset
from the source, and the effect can be mixed with the destination value to create different
effects.
The Link behavior can be applied to parameters animated with behaviors or keyframes;
however, it does not affect the parameter when the Start Values or End Values are zero.
When using the Link behavior to control an object’s position parameter, the linked
coordinates are based on the center point of the current group. So when an object is
linked to another object in the same group, it will share an identical position. However,
if the source object is in a different group, the coordinates might appear offset in space.
428 Chapter 9 Using Behaviors