2009

Controls in the rollout affect velocity in three ways:
■ Control the absolute velocity at a key using the In/Out values
■ Average velocity over a specified amount of time using Normalize Time
■ Force constant velocity from one component key to the next using
Constant Velocity
In/Out The In field displays the rate of change as the parameter approaches
the key. The Out field displays the rate of change as the parameter leaves the
key.
These fields are active only for keys using the Custom tangent type.
The number in the field is the rate of change expressed as parameter units per
Tick. By changing the two values for X, Y, and Z you are changing the length
and angle of the tangent handle.
Lock button When on, changing one Custom tangent changes the other by
equal but opposite amount. For example, if the Lock button is on and the In
value is 0.85, then the Out value is -0.85.
Normalize Time Averages the position of the keys in time and is applicable
to any consecutive blocks of selected keys. Useful if you want to smooth out
the motion and have an object that speeds up, slows down, speeds up, and
slows down.
Constant Velocity Interpolates values between a key and the next one in a
way that makes the object move at a constant velocity across that curve
segment.
Free Handle Used for automatically updating the length of the tangent handle.
When this is turned off, the length of the tangent is at a fixed percentage from
its neighboring key. As you move a key, the handles adjust to stay the same
percentage away from the neighboring keys. When this is turned on, the
handle lengths are based on time lengths.
Create Position Lock Key / Create Rotation Lock Key Makes the incoming
handle of the current key linear, and the out going handle of the previous
key linear. This is to prevent overshoot from the spline interpolation.
To use these two features, you must first create a keyboard shortcut in
Customize > Customize User Interface. Look for Create Position Lock Key and
Create Rotation Lock Key in the keyboard shortcut list and assign a key. Or
you can also add these commands to the quad menu.
Bezier Controllers | 3141