User Guide

CHAPTER 14

414

Using Motion Math (PB only)

Gravity (gravity.mm and gravity.mov) Applies both a gravitational and a frictional force

to a speciﬁed layer.

Layer Audio (layeraud.mm and layeraud.mov) Copies the values of the audio amplitude

of a single layer, multiplies them by a speciﬁed scale factor, and then creates keyframes for

the speciﬁed property using the new values.

Point At (pointat.mm and pointat.mov) Creates rotation keyframes for one layer, keeping

the top of its y-axis pointing at the anchor point of the other layer. Both layers can be

moving.

Relative Corner to Absolute Corner (cornpin.mm and cornpin.mov) Bases the motion

path of the layer on the position of the corner-pin keyframes instead of on the anchor

point. In other words, this script makes the motion paths of the corner pins relative to the

composition.

Scale All Layers (scaleall.mm and scaleall.mov) Scales both the size and position of all

selected layers. Use this script to resize all layers in a composition by the same amount.

Scale Layers by Comp Size (scaleby.mm and scaleby.mov) Scales layers in a composition

to new sizes and positions based on new composition dimensions. Use this script to resize

layers proportionally after changing the dimensions of a composition.

Span (span.mm and span.mov) Attaches each end of a third layer to the anchor point of

the two moving layers, creating position, rotation, and scale keyframes for the third layer,

as necessary.

Spring (spring.mm and spring.mov) Simulates the motion of one object dragging another

with a spring attached between them. This script creates position keyframes for only one

of the two layers.

Running and editing existing scripts

The following procedure outlines the overall process for loading and running a script.

Note, however, that each of the prewritten scripts varies slightly in its application. Editing

existing scripts makes it easy to create unique effects for your composition. After editing

an existing script, make sure that you save the script to a different name so the original

script stays intact.

UG.book Page 414 Wednesday, February 21, 2001 12:05 PM