Adobe After Effects CS3 Manuel d'utilisateur télécharger pdf (Page 499)

AFTER EFFECTS CS3

User Guide

494

Repulsion Controls whether bubbles bounce off each other, stick to each other, or pass through each other. At a value

of 0, bubbles don’t collide; they pass through each other. The higher the Repulsion value, the more likely bubbles are

to interact with each other when they collide.

Pop Velocity Controls how popping bubbles affect each other. When a bubble pops, it affects other bubbles around

itbyleavingaholethatotherbubblescanfill,pushingotherbubblesaway,orpoppingotherbubbles.Thehigherthe

value, the more popping bubbles affect one another.

Viscosity Specifies the rate at which bubbles decelerate after being released from the producer point, and controls

the speed of the flow of the bubbles. A high Viscosity value creates resistance as the bubbles get farther away from

the producer point, causing them to slow down. If Viscosity is set high enough, the bubbles stop. The thicker the

substance, the higher the Viscosity. For example, if you want to create the effect of bubbles traveling through oil, set

Viscosity fairly high, so that the bubbles meet resistance as they travel. To create the effect of bubbles floating in air,

set Viscosity fairly low.

Stickiness Causes bubbles to clump together and makes them less vulnerable to other Physics controls like Wind

Direction. The higher the Stickiness, the more likely the bubbles are to form clusters and cling. Use Stickiness and

Viscosity to create a bubble cluster.

Zoom and Universe Size controls

Zoom Zooms in or out around the center of the bubble universe. To create really large bubbles, increase the Zoom

value instead of the Size value because large bubble sizes can be unstable.

Universe Size Sets the boundaries of the bubble universe. When bubbles completely leave the universe, they pop and

aregoneforever.Bydefault,theuniverseisthesizeofthelayer.Valuesgreaterthan1createauniversethatstretches

beyond the borders of the layer. Use higher values to make bubbles flow in from off-screen, or make it possible to

zoom out and bring them back into the picture. Using a value lower than 1 clips the bubbles before they reach the

edge of the layer. For example, when you want to confine bubbles to a specific area, such as inside a mask shape, set

Universe Size a little larger than the mask size to remove all the extra bubbles and speed up the rendering process.

Rendering controls

The Rendering controls specify the appearance of the bubbles, including their texture and reflection:

Blend Mode Specifies the relative transparency of bubbles as they intersect. Transparent blends the bubbles

smoothly together, allowing you to see the bubbles through each other. Solid Old On Top makes a younger bubble

appear to be underneath an older bubble and eliminates transparency. Use this setting to simulate bubbles flowing

toward you. Solid New On Top makes younger bubbles appear to be on top of older bubbles and also eliminates

transparency. Use this setting to make bubbles appear as if they are flowing downhill.

Bubble Texture Specifies the bubble texture. Use a preset texture, or create your own. To see the texture, make sure

that View is set to Rendered. To create your own texture, select User Defined, and from the Bubble Texture Layer

menu, choose the layer you want to use as the bubble.

Note: The preset bubble textures are prerendered 64 x 64 images. If you zoom in above 64 x 64, the bubble appears blurry.

To avoid this, use a higher-resolution custom bubble.

Bubble Texture Layer Specifies the layer you want to use as the bubble image. To use this control, choose User

Defined from the Bubble Texture menu. If you want the layer to appear only as a bubble, turn off the video switch

for the layer in the Timeline panel.

Note: You can use any file type that After Effects supports. If you plan on zooming in or using a large bubble size, make

surethattheresolutionofthelayerishighenoughtoavoidblurring.Remember,thisdoesn’thavetobeanormalbubble.

You can make blood cells, starfish, bugs, space aliens, or flying monkeys. If it’s a layer in your composition, it can be a

bubble.

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Adobe After Effects CS3 Manuel d'utilisateur Page 499

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