To Apply A Mask And Time Displacement To A Layer (Pro Only); Timewarp Effect (Pro Only); Block Dissolve Effect; Transition Effects - Adobe AFTER EFFECTS 7.0 Manual

Choose a displacement map from the Time Displacement Layer menu, which lists all layers in the composition.
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Grayscale maps are recommended.
Note: After Effects uses the layer you select in its original form, without any masking, effects, or transformations you
may have applied. If you want to use the layer with those alterations included in the displacement map, precompose that
layer using the Move All Attributes into the New Composition option.
Adjust the Time Displacement controls.
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To apply a mask and time displacement to a layer (Pro only)

Any mask you apply to the original layer is ignored by the Time Displacement effect. To use a mask with time
displacement in the same layer, precompose the layer as a separate composition, and then apply the mask inside the
new composition. This method, however, can significantly increase rendering time.
1 In the Composition panel, select the layer you want to distort.
Apply the Time Displacement effect.
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Choose Layer > Pre-compose.
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4 Select the Leave All Attributes in "Comp [composition number]" option, specify a name for the new composition
or accept the default name, and then click OK.
In the new composition, double-click the layer you are distorting. In the Layer panel, apply the mask.
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Timewarp effect (Pro only)

This effect works with 8-bpc and 16-bpc color.
Timewarp effect
See also
"To apply the Timewarp effect (Pro only)" on page 239

Transition effects

Block Dissolve effect

The Block Dissolve effect makes a layer disappear in random blocks. The width and height of the blocks, in pixels,
can be set independently. At Draft quality, the blocks are placed with pixel accuracy and have sharply defined edges;
at Best quality, the blocks can be positioned with subpixel accuracy and have soft edges.
This effect works with 8-bpc and 16-bpc color.
ADOBE AFTER EFFECTS 7.0
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User Guide