Adobe After Effects CS3 Manual do Utilizador descarregar pdf (Página 272)

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AFTER EFFECTS CS3

User Guide

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When you use the Pan Behind tool to pan a layer behind a mask, the mask’s position remains constant in the Compo-

sitionpanelbutchangesintheLayerpanel.Themaskedlayer’sPositionvalueschangeinrelationtothecomposition.

As you pan past the edges of the layer’s frame, the layer’s Mask Path values also change. Using the Pan Behind tool

savessteps;withoutit,youwouldhavetochangethemaskedlayer’sPositionandMaskPathpropertiesmanually.You

can animate a layer panning behind another layer by setting keyframes for the masked layer’s Position and Mask Path

properties.

When you use the Pan Behind tool in the Composition panel, After Effects automatically makes two adjustments. In the Layer panel, the mask

is moved in relation to its layer (top), and in the Composition panel, the layer is moved in relation to the composition (bottom).

Move a mask

Select the mask or masks you want to move.

2 In the Composition panel, drag the mask or masks to a new location. To constrain the movement of the mask or

masks to horizontal or vertical, hold down Shift after you start dragging.

Pan a layer behind its mask

Select the Pan Behind tool in the Tools panel .

2 Click inside the mask area in the Composition panel and drag the layer to a new position.

Apply motion blur to a mask

Motion blur creates a blur based on a mask’s movement in the composition. You can apply motion blur to individual

masks. The composition’s Enable Motion Blur switch must be selected for any layer or any mask within a layer to

exhibit motion blur.

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Adobe After Effects CS3 Manual do Utilizador Página 272

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