Game Development Reference
The Paint Bucket Final comp in this project contains what I did
with this project. I applied a wiggle expression to the Fill Point
property in the Paint Bucket effect. That way, the Fill Point would
only occasionally land on an opaque area of the layer, and fi ll it
with color. The result is a very cool strobe-like effect.
The Radio Waves Effect
The Radio Waves effect is a simple particle system. It shoots out
a constant stream of concentric shapes. As you might imagine,
the purpose of the effect is to simulate emission of radio waves.
But, this is a very powerful effect that does much more.
As with most particle systems, the effect autoanimates. We
don't need to control the particles; we only control the system
that emits the particles. Now, there are loads of parameters in
Radio Waves, and most of them are either self-explanatory or not
very useful. So, we'll just hit the highlights here.
From my experience, the two most important parameters are
Frequency (in the Wave Motion area), and Producer Point (at the
very top of the Effect Controls panel). Increasing the Frequency
value increases the rate at which the waves are produced, which
in effect creates more waves. You can also animate the Producer
Point. In many other effects, animating its position (in effect)
wouldn't be such a big deal. But, with Radio Waves, it leaves a
really cool trail of waves. The coolness of the effect is compounded
by animating the Color value (in the Stroke area) (Fig. 9.37).
Under the Polygon area of the effect, there are some options
that give you control over the shape. It's interesting to note
that the initial shape of this effect isn't really a circle. It's really
a 64-sided polygon. To increase the smoothness of the circles,
Figure 9.37 The Radio Waves
effect, with Frequency increased,
and the Producer Point and Color