Adobe 12040118 - After Effects Standard Tutorial page 471

Repeat Mode Specifies how a scaled-down sky layer is tiled. Once uses only one tile, basically turning tiling off. Tiles uses the traditional tiling
method of abutting the right edge of one layer tile to the left edge of another layer tile. This option works well if the layer contains a repeating
pattern, like a logo, that needs to read a certain way. Reflected abuts each edge of a layer tile to a mirrored copy of the tile. This option can
eliminate a hard edge where the two tiles meet.
If Layer Size Differs Specifies how to handle the layer when it is smaller than the composition. Intensity specifies the opacity of the sky layer.
Convergence specifies how close the sky and the bottom or water layer appear, controlling the extent to which the waves distort the sky.
Foam effect
This effect generates bubbles that flow, cling, and pop. Use the controls for the effect to adjust attributes for the bubbles such as stickiness,
viscosity, life span, and bubble strength. You can control exactly how the foam particles interact with each other and with their environment, and
specify a separate layer to act as a map, controlling precisely where the foam flows. For example, you can have particles flow around a logo or fill
a logo with bubbles.
This effect works with 8-bpc color.
Original (upper-left), with Foam applied (lower-left), and with a robot layer used as the Bubble Texture Layer (lower-right)
You can also substitute any image or movie for bubbles. For example, you can create swarms of ants, flocks of birds, or crowds of people.
Note: On a frame-by-frame basis, Foam renders quickly, but the slightest adjustment in the initial settings is likely to result in very different output
a few seconds into the simulation. When making adjustments to Physics controls, the farther into the simulation you are, the longer the
adjustments take to render, because each adjustment results in the simulation being recalculated all the way back to the beginning. Not every
frame takes this long to calculate; once Foam adjusts to the change, rendering speeds up again.
View controls
Draft Displays the bubbles without fully rendering them. Using Draft mode is a fast way to preview the behavior of the bubbles. Draft mode is the
only way to preview the universe edges, the Flow Map alignment, and the Producer location, orientation, and size. Blue ellipses represent bubbles.
A red ellipse represents the Producer Point. A red rectangle represents the bubble universe.
Draft + Flow Map Displays the Draft view wireframe superimposed over a grayscale representation of the flow map, if selected.
Rendered Displays the final output of the animation.
Producer controls
The Producer controls specify the location where the bubbles originate, as well as the speed at which they are generated:
Producer Point The center of the area from which the bubbles can be produced.
Producer X Size, Producer Y Size Adjust the width and height of the area from which the bubbles can be produced.
Producer Orientation Adjusts the rotation (orientation) of the area from which the bubbles can be produced. Producer Orientation has no
noticeable effect when Producer X Size and Producer Y Size are identical.
Zoom Producer Point Specifies whether the producer point and all of its associated keyframes remain relative to the universe (selected) or to the
screen (unselected) when you zoom in or out on it. For example, if you set a position for Producer Point in the upper-left corner of the layer and
then zoom out on that layer, the producer point stays in the upper-left corner of the screen if you don't select Zoom Producer Point. If you select
Zoom Producer Point, the point moves with the universe as it is zoomed out, and the point ends up closer to the center of the screen.
Production Rate Determines the rate at which bubbles are generated. This control does not affect the number of bubbles per frame. Rather, the
rate is the average number of bubbles generated every 30th of a second. Higher numbers yield more bubbles.
If a large number of bubbles appear in the same point at the same time, some may pop. If you want a lot of foam, increase the values for
Producer X Size and Producer Y Size so that the bubbles don't immediately pop each other.
Bubbles controls
Size Specifies the average size for adult bubbles. Size Variance, Bubble Growth Speed, and Random Seed also affect the size of a bubble in any
particular frame.
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