Apple Motion 3 - Manual (Page 740)

740 Chapter 8 Working with Particles
Increment Type: Determines which method is used to spin particles over their lifetime.
There are three options:
 Rate: Specifies a steady rate at which particles change spin over their lifetime. When
Rate is selected, the Spin Rate parameter becomes available.
 Spin Rate: Allows you to define how quickly each particle changes spins. Positive
values spin particles faster over time and negative values spin particles slower over
time.
 Birth and Death Values: Specifies starting and ending spin degrees that are used to
animate each particle’s rotation over its lifetime. The spin amount generated by this
option for a specific particle at a specific time is added to the pre-existing particle
spin (defined in the Cell Controls section of the Emitter tab). When this option is
selected, the Spin At Birth and Spin At Death parameters become available.
 Spin At Birth: Determines the initial spin of the particles when they are created.
 Spin At Death: Determines the spin of the particles at the end of their lifetime.
 Custom: This mini-curve editor allows you to customize the spin of the particles over
their lifetime. Click the disclosure triangle to display the mini-curve editor in the
Inspector. For more information on using mini-curve editors, see “
Mini-Curve Editor ”
on page 555.
 Custom Spin: Use this slider to adjust the value of the selected keyframe in the
mini-curve editor.
 Over Life: Use this slider to adjust the position of the selected keyframe in the life
of the particle.
Applying Filters to Particle Systems
Filters can only be applied to a particle system’s emitter. (Filters can be applied to the
source of a particle cell, but not to a cell directly.) As a result, filters always affect the
entire particle system, including every single cell, as if it were a single object. You
cannot apply separate filters to individual cells.
Light Valve particle system default Light Valve with Bulge filter applied