Apple Shake 4 - Manual (Page 574)

574 Chapter 20 Rotoscoping
The Lock Tangents button locks or unlocks
the tangents of adjacent points when
moving any point. In the first example, the
tangents are unlocked. Therefore, the
middle blue point is moved down. Shake
tries to keep the tangents of the adjacent
points smooth, and therefore moves the
tangents.
If Lock Tangents is on, the adjacent tangents
stay locked in place. This provides accuracy
for adjacent segments, but creates a more
irregular shape.
The Show/Hide Tangents button displays or
hides the tangents on the shape.
The Enable/Disable Transform Control
button turns on and off the display of the
transform tool for the QuickShape.
The Delete Control Point button deletes all
selected points.
Button Usage Example