Adobe After Effects - Manual (Page 565)

Bubble Growth Speed
Strength
Initial Speed
Initial Direction
Wind Speed
Wind Direction
Turbulence
Wobble Amount
Repulsion
Pop Velocity
Viscosity
Stickiness
Zoom
were hitting a wall. Rather, this value is a target lifespan; some bubbles pop early, and others may last until the end.
Specifies how fast a bubble reaches full size. When a bubble is released from the producer point, it generally starts out
rather small. If you set this value too high and you specify a small producer area, the bubbles pop each other, and the effect generates fewer
bubbles than expected.
Influences how likely a bubble is to pop before it reaches its Lifespan limit. Lowering the Strength for a bubble makes it more likely to
pop early in its life, when forces like wind and flow maps act upon it. Lower values are good for soap bubbles. The highest value is recommended
for flocking animations.
Set this value low, and set Pop Velocity high to create chain reactions of popping bubbles.
Physics controls
The Physics controls specify the motion and behavior of the bubbles:
Sets the speed of the bubble as it is emitted by the producer point. The other Physics parameters affect this speed.
Low Initial Speed values in conjunction with the default producer size don’t affect the results much because the bubbles bounce off each other.
For more control over initial speed, increase the values for Producer X Size and Producer Y Size
Sets the initial direction in which the bubble moves as it emerges from the producer point. Other bubbles and other Physics
controls also affect the direction.
Sets the speed of the wind that pushes the bubbles in the direction specified by Wind Direction.
Sets the direction in which the bubbles blow. Animate this control to create turbulent wind effects. Wind affects bubbles if Wind
Speed is greater than 0.
Applies small random forces to the bubbles, making them behave chaotically.
Randomly changes the shape of bubbles from perfectly round to a more natural elliptical shape.
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.
Controls how popping bubbles affect each other. When a bubble pops, it affects other bubbles around it by leaving a hole that other
bubbles can fill, pushing other bubbles away, or popping other bubbles. The higher the value, the more popping bubbles affect one another.
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.
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
Zooms in or out around the center of the bubble universe. To create large bubbles, increase the Zoom value instead of the Size value
because large bubble sizes can be unstable.
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