You can use an expression to control attributes of particle objects. Particle expressions can be more complex than other types of expressions. For example, you can write an expression to control all particles in an object the same way, or you can control each particle differently.

In this lesson you learn how to:

• create a particle object
• create a creation expression to set the initial color of the particles
• create a runtime expression to control the color during playback
• use a random function to randomize how the color changes
• control the timing of an expression