Radio Waves
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Two of the most important controls for Radio Waves are Wave Motion and Stroke.
Wave Motion defines how many waves are created, how quickly they move, and the direction that they will move after being created. [an error occurred while processing this directive]
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| The Wave Motion controls |
Frequency defines how many waves per second are created. A Frequency of 1, will create 1 wave per second, while a Frequency of 10, will create 10 waves per second.
Expansion determines how fast the wave moves once it has been created from the Producer Point.
The last control that is important for your basic understanding of Radio Waves, and will help us in our exercise is Lifespan. This controls how long a radio wave lives before it vanishes from existence. The default setting of 10 means once a wave is created it will last for 10 seconds.
So how do you control how many waves are created? There may be very specific times when you only need two or three waves created in a given amount of time. Because every control in Radio Waves is keyframeable, that is the way to approach this problem.
In the following example, I have two waves being generated once a logo “hits” the background.
| An example of how Radio Waves can be used in your next production |
To do this, I set the initial Frequency to 2 and the Expansion to 6. This means that a new wave is created every 15 frames. In order to only have two waves, I created a keyframe at frame 15 with the Frequency set to 2, and then at frame 16 changed the Frequency to 0. Since two waves have already been created in the first second, no other waves will be generated.
To get the waves to begin on cue, manually moving the layer in the Timeline will be necessary. You may also have to do some clever trimming of the In point (Option+[ on the Mac or Alt+[ on the PC).
Source: Digital Media Online, Inc.
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