Apple Motion 2 Tutorials - Manual (Page 196)

196 Tutorial 4 Working With Particles
5 Set Opacity to 0 percent.
The right end of the opacity bar displays black as well. With these settings, the particles
will fade in quickly, become 100 percent opaque, then fade out slowly, reaching 100
percent transparency before the end of their Life.
6 Click the disclosure triangle next to Color Over Life to hide the Gradient Editor.
Next, make changes to the Scale and Scale Range parameters, to vary the size of the
particles.
To vary the size of the particles:
m Set Scale Range to 25.
Now the particles are not all the same size. Next, alter the Birth Rate parameter to
decrease the number of particles, and adjust the Birth Rate Range as well.
To adjust and vary the rate of particles emitted:
1 Set Birth Rate to 20.
The particles are now generated at a slower rate.
2 Set Birth Rate Range to 12.
A non-zero value for Birth Rate Range causes the rate at which the particles are
released to vary, and therefore the release pattern is not as uniform.