Apple Motion 3 - Manual (Page 728)

728 Chapter 8 Working with Particles
Spin: A dial that animates particles in a system by initially spinning each individual
particle around its center. Adjustments to this control are in degrees per second.
Spin Randomness: A dial that defines an amount of variance in the spin of generated
particles. A value of 0 results in no variance—all particles from the selected cell spin at
the same rate. A value greater than 0 introduces a variance defined by the Spin
parameter, plus or minus a random value falling within the Spin Randomness.
Additive Blend: By default, particles are composited together using the “normal” blend
mode. Turn on this checkbox to composite all overlapping generated particles together
using the Additive blending mode. This blending occurs in addition to whichever
compositing method is already being used. The result is that the brightness of
overlapping objects is intensified. This effect applies only to the particle system itself—
the blend mode of the emitter determines how the result of the emitter is blended into
the scene.
Color Mode: A pop-up menu that determines if and how particles are tinted. There are
five options:
 Original: Particles are generated using their original colors. When Original is chosen,
the Opacity Over Life parameter appears. Adjust the opacity controls to animate
changes to the opacity of particles over their lifetime.
Additive Blend off Additive Blend on