Apple Shake 4 New Features - Manual (Page 49)

Chapter 2 Major Features and New Nodes 49
When you click retimeShapes, the Node Retime window appears. The retimeShapes
command has two modes, Speed and Remap, which affect a RotoShape node’s
keyframes similarly to the Speed and Remap options found within the Timing tab of a
FileIn node.
Speed Adjustments
The default Operation, Speed, lets you compress or expand all of the keyframes within
the RotoShape node by a fixed multiplier.
Suppose you have the following group of keyframes:
Using the default Amount value of 2.0 and clicking apply contracts the keyframes
proportionally—resulting in the following distribution:
invert
Turning on the Invert button expands the keyframes by the Amount value, instead of
contracting them. This has an identical effect to setting Amount to a decimal value
between 0 and 1.
Remap Adjustments
Setting Operation to Remap provides a way for you to use curve expressions to retime
the current keyframe distribution. This lets you apply a retiming curve from a FileIn node
to the keyframes of a shape that you’ve already animated to rotoscope that image.