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Adobe After Effects Help
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Corner Pin (PB only)
This effect distorts an image by changing the position of each of its four corners. Use it to
stretch, shrink, skew, or twist an image, or to simulate perspective or movement that
pivots from the edge of a layer, such as a door opening. You can also use it to attach a layer
to a moving rectangular region tracked by the Motion Tracker. See "About tracking motion
(PB only)" on page 305. You can move the corner pins in the Composition window or the
Effect Controls window.
Displacement Map (PB only)
This effect distorts a layer by displacing pixels horizontally and vertically based on the
color values of pixels in a second layer, called the displacement map. The type of distortion
created by the Displacement Map effect can vary greatly, depending on the displacement
map and options you select. Maximum displacement occurs only when the value of the
specified color property is either 0 or 255. Values between 0 and 255 produce displace-
ments calculated using the equation below. Negative values reverse the direction of
displacement.
Displacement amount = maximum_displacement * (2 * (color value – 128)/256)
A
A. Displacement map B. Map centered C. Map stretched D. Map tiled
For more information, see the After Effects product section on Adobe's Web site.
Mesh Warp (PB only)
This effect applies a grid of Bezier patches (squares in the grid) over a layer, which you can
manipulate to distort areas of an image. Each corner of a patch includes a vertex and two
to four tangents (points that control the curvature of the line segment that makes up the
edge of the patch). The number of tangents depends on whether the vertex is in a corner,
on an edge, or inside the grid. Move the vertices and tangents to manipulate the shape of
the curved line segment. The image follows the grid shape according to the elasticity
setting you have chosen and the boundary created by the adjacent patch. Each patch
becomes a boundary for the distortion.
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