Apple Shake 4 - Manual (Page 807)

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Warping and Morphing Images
Shake provides powerful warping and morphing tools
that are flexible enough to use for a wide variety of
compositing tasks, from creating or correcting lens
distortions, to morphing one subject into another.
About Warps
Shake’s various linear transformation nodes, such as Move2D, Move3D, Rotate, and Scale,
operate on entire images so that each pixel is moved, rotated, or scaled by the same
amount. Even the CornerPin node applies the same transformation to every pixel—an
amount defined by the location of each of the four corners. Shake’s warp nodes,
including iDisplace, Turbulate, and Twirl, and the Warper and Morpher nodes, differ from
linear transformations in that each pixel’s transformation is calculated individually.
Depending on the type and settings of the warp you’re creating, each pixel of an image
can be moved independently of its neighbor. For this reason, warps can be referred to
as “nonlinear transformations.”
The Basic Warp Nodes
Shake’s basic warp nodes are good for deforming one image using another as a guide,
making rippling patterns, randomizing the texture of an image, and other similar
effects. These nodes are quite powerful, but their main strength is in making wholesale
image deformations while requiring a minimum of manual control, using either
mathematical expressions or secondary images to define the warping being done. This
section discusses the basic warp nodes, located in the Warp Tool tab.
DisplaceX
The DisplaceX node is a general purpose warping tool that is similar to WarpX, except
you can access a second warping image to control the distribution of a warp. Any
formula can be entered in the x and y fields for custom warps.
You can also create multiline expressions with this node.