ABSTRACT
The Wave Motion area contains some useful parameters also. Expansion controls the speed at which the waves move away from the Producer Point once emitted. Think of the caterpillar from Alice in Wonderland blowing smoke rings into Alice’s face. The smoke came out quickly, traveling a great distance, and then slowed down. To recreate that effect, we have to increase the Expansion value. Orientation and Spin are similar, in that both control the rotation of the waves (which is diffi cult to discern when your waves are circular). Orientation determines the angle of the waves when fi rst emitted. To animate spinning waves, animate the Spin property. Velocity controls the speed at which waves are emitted. If the Velocity value is greater than 0, then you can use the Direction property to determine the direction in which waves are emitted. The Lifespan property determines-in seconds-how long each wave remains before it disappears.
