Apple Shake 4 - Manual (Page 860)

860 Chapter 27 Warping and Morphing Images
To add a new keyframe, move the playhead to a frame where you want to make an
adjustment, click the Autokey button for the overallDisplacement parameter in the
Parameters tab, then adjust the overallDisplacement slider.
A value of 0 in both the overallDisplacement and overallDissolve parameters results in
an unmorphed source image. A value of .5 produces a morph that’s halfway between
the source and target images, and a value of 1 results in the end of the morph—the
final target image.
While you adjust these parameters, enable the Show Displaced Target Shapes button in
the Viewer shelf to see the actual position of the displacement targets as defined by
the overallDisplacement and connection_Displacement parameters. These indicators
are designed to help you see what the deformation will look like, without having to
render the entire image. Displaced target shapes are pink by default.
Note: As with the Warper node, you can adjust the individual displacement of each
source/target shape pair using the connection_Displacement and connection_Dissolve
parameters nested within each connection_Name parameter in the Parameters tab.
Keyframing these parameters with separate timings creates a more sophisticated-
looking effect than if you simply animated the overallDisplacement parameter.
11 If you want, you can keyframe the overallDissolve parameter separately from the
overallDisplacement parameter to create different effects. Adjustments to the
overallDissolve parameter control how the source image fades into the target image—
this works exactly like a Mix node.
Note: By default, the overallDissolve parameter is linked to the overallDisplacement
parameter, so keyframing one will automatically keyframe the other to the same value.
Keyframing the overallDissolve parameter will break this link.
12 Test the resulting effect to see how well it works. If you see problems, toggle the Viewer
between the source warped image and target warped image to see how successfully
the source and target images are matching. Viewing each image independently makes
it easier to spot unwanted artifacts stemming from poorly placed or inadequate
numbers of source/target shape pairs.
If you see problems, either adjust the position and shape of the source and target
shapes as necessary, or identify additional features to create source/target shape pairs
in order to increase the amount of control you have over the effect.