Apple Motion 4 - Manual (Page 1393)

For more information on rasterization with 2D and 3D groups, see Groups and
Rasterization .
Shapes and Rasterization
When a group becomes rasterized, all layers within that group—including masks, shapes,
and paint strokes—are affected and may no longer interact with other layers and groups
as expected.
Because paint strokes are rendered in a plane, they are always rasterized (independent
of other objects within the same group). This affects how the dabs that comprise a paint
stroke interact with objects in the same group.
Note: Because a paint stroke is always rasterized, no rasterization indicator appears around
the paint stroke icon.
For more information on rasterization with 2D and 3D groups, see Groups and
Rasterization .
Particles and Rasterization
When a group becomes rasterized, all layers within that group—including particles—are
affected and may no longer interact with other layers and groups as expected.
The following examples demonstrate how rasterization affects particles in 2D groups.
The first set of illustrations depicts a nonrasterized 2D group that contains a particle
emitter set to the Add blend mode. The right illustration displays the particles interacting
with the group beneath the emitter in the Layers tab (the group containing the “orange
texture” layer). Note that the star particles interact with the pixels of the underlying group,
blending with the “orange texture” light streak effect.
1393 Appendix A About Rasterization