Adobe After Effects CS4 Manual de usuario descargar pdf (Pagina 196)

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USING AFTER EFFECTS CS4

Layers and properties

Last updated 12/21/2009

You can specify which 3D layers a light affects by designating the light as an adjustment layer: place the light in the

Timeline panel above the layers on which you want it to shine. Layers that are above a light adjustment layer in the

layer stacking order in the Timeline panel do not receive the light, regardless of the positions of the layers in the

Composition panel.

More Help topics

“3D layers” on page 179

“Auto-Orientation options” on page 153

“Adjustment layers” on page 141

Create a light

❖ Choose Layer > New > Light, or press Ctrl+Alt+Shift+L (Windows) or Command+Option+Shift+L (Mac OS).

Note: By default, new layers begin at the beginning of the composition duration. You can instead choose to have new

layers begin at the current time by deselecting the Create Layers At Composition Start Time preference (Edit

Preferences

> General (Windows) or After Effects > Preferences > General (Mac OS)).

Change light settings

❖ Double-click a light layer in the Timeline panel or select the layer and choose Layer > Light Settings.

Light settings

Light Type Parallel emits directional, unconstrained light from an infinitely distant source, approximating the light

from a source like the Sun. Spot emits light from a source that is constrained by a cone, like a flashlight or a spotlight

used in stage productions. Point emits unconstrained omnidirectional light, like the rays from a bare light bulb.

Ambient creates light that has no source but rather contributes to the overall brightness of a scene and casts no

shadows.

Note: Because the position in space of an Ambient light does not affect its influence on other layers, an Ambient light does

not have an icon in the Composition panel.

Intensity The brightness of the light. Negative values create nonlight. Nonlight subtracts color from a layer. For

example, if a layer is already lit, creating a directional light with negative values also pointing at that layer darkens an

area on the layer.

Cone Angle The angle of the cone surrounding the source of a light, which determines the width of the beam at a

distance. This control is active only if Spot is selected for Light Type. The cone angle of a Spot light is indicated by the

shape of the light icon in the Composition panel.

Cone Feather The edge softness of a spotlight. This control is active only if Spot is selected for Light Type.

Color The color of the light.

Casts Shadows Specifies whether the light source causes a layer to cast a shadow. The Accepts Shadows material

option must be On for a layer to receive a shadow; this setting is the default. The Casts Shadows material option must

be On for a layer to cast shadows; this setting is not the default.

Press Alt+Shift+C (Windows) or Option+Shift+C (Mac OS) to toggle Casts Shadows for selected layers. Press AA to

show Material Options properties in the Timeline panel.

Shadow Darkness Sets the darkness of the shadow. This control is active only if Casts Shadows is selected.

Shadow Diffusion Sets the softness of a shadow based on its apparent distance from the shadowing layer. Larger values

create softer shadows. This control is active only if Casts Shadows is selected.

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