Game Development Reference
In-Depth Information
Figure 19.11 A result of using
the fractal noise PRECOMP as the
displacement layer.
Many of the settings in this effect (such as motion blur, time
stretching, and frame blending) can also be seen in different forms
in the Timeline panel, although the Timeline and the Timewarp
effect act independently of each other.
First we need to discuss the Method drop down because this is
one of the greatest aspects of this effect. When footage is slowed
down, it creates a serious dilemma. Let's say you have a piece
of footage that is 30 fps. If you slow it down to 50% of its origi-
nal speed, then it will be twice as long. Because it is twice as long,
After Effects will have to do something for all those extra frames.
Think of this like typing in a Word document. If I type
12345
and then I decide to stretch those fi ves across the width of
the document, I'll have to do something to fi ll in the gaps. I can
duplicate the numbers:
11111111111122222222222223333333333333333444444444444
4555555555555
I can also place spaces between them:
1 2 3 4 5.
The point is that something has to fi ll the gaps between them.
Frames in time work the same way.
The Method drop down is key because it determines how After
Effects will stretch the footage. Whole Frames renders the fastest
but also the lowest on the quality totem pole. Whole Frames just
duplicates frames to fi ll the gaps. If you slow down your footage
a great deal, the footage will seem to stutter during playback.
The Frame Mix option is essentially a cross dissolve transition
from frame to frame. The “real” frame will fade out over time
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