Apple Shake 4 - Manual (Page 546)

546 Chapter 20 Rotoscoping
Note: You can also resize every transform control appearing in the Viewer by holding
the Command key down while dragging the handles of any transform control in the
Viewer.
rotoTransformIncrement
This parameter allows you to adjust the sensitivity of shape transform controls. When
this parameter is set to lower values, transform handles move more slowly when
dragged, allowing more detailed control. At higher values, transform handles move
more quickly when dragged. A slider lets you choose from a range of 1-6. The default
value is 5, which matches the transform control sensitivity of previous versions of Shake.
rotoPickRadius
This parameter provides the ability to select individual points on a shape that fall
within a user-definable region around the pointer. This allows you to easily select
points that are near the pointer that may be hard to select by clicking directly. A slider
allows you to define how far, in pixels, the pointer may be from a point to select it.
rotoTangentCreationRadius
This parameter lets you define the distance you must drag the pointer when drawing a
shape point to turn it into a Bezier curve. Using this control, you can make it easier to
create curves when drawing shapes of different sizes. For example, you could increase
the distance you must drag to avoid accidentally creating Bezier curves, or you can
decrease the distance you must drag to make it easier to create Bezier curves when
drawing short shape segments.
Using the RotoShape Node
The RotoShape node can create multiple, spline-based shapes that can be used as an
alpha channel for an element, or to mask a layer or an effect. You can only create closed
shapes with the RotoShape node. Shapes created using the RotoShape node are
grayscale, and filled shapes are white against a black background. An alpha channel is
automatically created, and has exactly the same data as the R, G, and B channels.
Shapes can be filled or unfilled. For a shape to have an effect on the alpha channel, it
must be filled. Shapes that are filled with white create solid areas in the alpha channel.
Shapes that are filled with black create areas of transparency. Unfilled shapes have no
effect on the alpha channel.