Adobe After Effects CS3 Bedienungsanleitung PDF herunterladen (Seite 503)

AFTER EFFECTS CS3

User Guide

498

WiththeGrid,anewparticleappearsoneveryframeateachgridintersection.Youcan’tadjustthisfrequency,butif

you want to turn off the Grid or make the Grid stop generating particles at specific times, set the Particle Radius/Font

Sizecontrolto0,orusekeyframestoanimatethevalueoftheParticlesAcrossandParticlesDowncontrols.Tomake

more particles appear in each frame, increase the values for Particles Across and Particles Down.

Note: Bydefault,theCannonisonandtheGridisoff.IfyouareusingtheGridandwanttostoptheCannonfromgener-

ating particles, turn off the Cannon by setting its Particles Per Second value to 0.

Position Specifies the (x,y) coordinates of the grid center. When a grid particle is created, it is centered over its grid

intersection, regardless of whether it is a dot, a layer, or a text character. If you’re using text characters as particles,

the Use Grid option in the Edit Grid Text dialog box is on by default, placing each character on its own grid inter-

section, so normal character spacing, word spacing, and kerning do not apply. If you want text characters to appear

at the grid position with normal spacing, use a text alignment other than the Use Grid option.

Width, Height Specify the dimensions of the grid, in pixels.

Particles Across, Particles Down Specify the number of particles to distribute horizontally and vertically across the

grid area. Particles are generated only when the value is 1 or more.

Note: If the Width, Height, Particles Across, and Particles Down controls are not available, the Use Grid option has been

turned off in the Edit Grid Text dialog box.

Color Sets the color of dots or text characters. This control has no effect if you use a layer as the particle source.

Particle Radius/Font Size Sets the radius of dots in pixels or the size of text characters in points. This control has no

effect if you use a layer as the particle source.

Layer Exploder and Particle Exploder

The Layer Exploder explodes a layer into new particles, and the Particle Exploder explodes a particle into more new

particles. In addition to explosion effects, the exploders are also handy for simulating fireworks or for rapidly

increasing the number of particles.

The following guidelines can help you control particles resulting from an explosion:

• Alayerisexplodedonceforeachframe.Bydefault,thiscreatesacontinuousshowerofparticlesfortheduration

ofthecomposition.Ifyouwanttostartorstopalayerexplosion,animatetheRadiusofNewParticlescontrolby

using keyframes so that its value is zero at times when you don’t want particles to be created.

• Ifthesourceofthelayerisanestedcomposition,youcansetdifferentOpacityvaluesorInandOutpointsforthe

layers within the nested composition to make the exploding layer transparent at different points in time. The Layer

Exploder does not create particles where the source of the layer is transparent.

• To change the position of the exploding layer, precompose the layer with its new position (use the Move All

Attributes Into The New Composition option), and then use the precomposed layer as the exploding layer.

• When you explode particles, the new particles inherit the position, velocity, opacity, scale, and rotation of the

original particles.

• After you explode layers or particles, the movement of particles is influenced by the Gravity, Repel, Wall, and

Property Mapper controls.

Some Persistent Property Mapper and Ephemeral Property Mapper options can make explosions more realistic. For

example,changeOpacitytomaketheresultingparticlesfadeout,orchangetheRed,Green,andBluecolorchannels

to make resulting particles change color as they appear to cool.

Explode Layer (Layer Exploder only) Specifies the layer you want to explode. To make the video disappear the

moment the particles appear, either turn off the video for the layer or trim the layer’s Out point.

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