2009

TIP You can also set the default tangent type through the Default In-Out Tangents
For New Keys
on page 7557 flyout. By doing so, each new key created with Set Key
Mode or Auto Key Mode follows the curve interpolation set by the default tangent
type.
Smooth Creates smooth interpolation through the key.
Linear Creates linear interpolation at the key.
A linear tangent affects the curve near the key only. Full linear interpolation
between two keys occurs only when the Out tangent of the first key and the
In tangent of the next key both use a linear tangent.
Step Creates binary interpolation from one key to the next. Step
tangents require a matched set between the Out tangent of one key and the
In tangent of the next key.
Choosing Step for the In tangent of the current key also sets the Out tangent
of the previous key to Step. Likewise, choosing Step for the Out tangent of
the current key also changes the In tangent of the next key to Step.
Using Step tangents, the outgoing value of a key is held constant until the
time of the next key is reached. The value then abruptly jumps to the value
of the next key. Use this tangent when you want to animate On/Off switching
or instantaneous changes from one value to the next.
Slow Causes the interpolated rate of change to slow down around
the key. A slow In tangent decelerates as it approaches the key. A slow Out
tangent begins slow and accelerates as it leaves the key.
Fast Causes the interpolated rate of change to speed up around the
key. The effect is the opposite of using slow. A fast In tangent accelerates as
it approaches the key. A fast Out tangent begins fast and decelerates as it leaves
the key.
3130 | Chapter 15 Animation