Game Development Reference
In-Depth Information
expressions) to generate random motion. Open up the Position
Jitter and Rotation Jitter groups. Remember that “jitter” is often
Adobe's way of saying “randomness. ” At fi rst, this may seem like
there's a lot going on. But really, there are just two properties each
for X, Y, and Z position and rotation jitter (Fig. 20.10).
Figure 20.10 The Position Jitter
and Rotation Jitter controls in the
Effect Controls panel.
Those two properties are jitter amount and jitter speed. Note
that all jitter amount properties have been set to 0 and all jitter
speed properties have been set to 1. As soon as you adjust the jit-
ter amount value for any property, that property autoanimates
randomly. No keyframes are necessary because of the jitter speed
value. If you were to take the jitter speed value to 0, the property
would not animate. Say for example that you wanted to have
these cards pulsate towards the camera randomly. You would
increase the Z Jitter Amount value, and that's all. If you wanted
the cards to randomly move in Z space and just stay there with-
out motion, you would increase the Z Jitter Amount value and
decrease the Z Jitter Speed value to 0. Adjusting these jitter values
can create an entire world of beautiful randomness (Fig. 20.11).
Creating the 3D Postcard Effect
Now we know that what it does, let's see a more practical
example of the Card Wipe effect at work. We're going to create a
myriad of postcards fl ying in 3D space that gather and then fl ip
to become a logo. In the Card Wipe.aep project, I've provided a
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