5

As you drag, both points defining the emission range rotate around the center of the
emission control symmetrically. When the emission range forms the rightward angle
shown below, release the mouse button. (As you adjust the emission range, the particles
rearrange themselves in the Canvas, enabling you to see the resulting effect.)
3 To make the particles drift upward, drag in the middle of the Emission Range segment,
rotating the blue arrow counterclockwise until it points up and slightly to the right of the
center control; continue dragging outward to lengthen the arrow.
The emission angle of the particles updates in the Canvas to reflect the new setting in
the HUD.
Remember: Although the angle of the arrow controls the emission angle of the particles,
the length of the arrow controls the speed of the particles. The longer the arrow, the faster
the particles, and vice versa.
At this point, the particles are all moving in the correct direction, but there aren’t very
many of them (there isn’t much of a fire yet).
679Chapter 14 Working with Particles