5.1.1

Chapter 25 About rasterization 1050
A 3D particle emitter can be rasterized independently of the group in which it resides.
Consequently, the resulting particles may not interact as expected with objects inside the same
group. For example, applying a Circle Blur lter to a particle emitter causes the particles to no
longer intersect with other objects in the same group. The same operations that cause a 3D
group to rasterize cause a 3D particle emitter to rasterize. To minimize this eect, apply the lter
to the emitter’s source object, or deselect the 3D checkbox in the Emitter Inspector.
When a group or a 3D particle emitter is rasterized, the group can no longer intersect with
objects outside the group. In the following illustration on the left, the nonrasterized group that
contains the particle emitter intersects with images from another group (when Render Particles
is set to In Global 3D). In the illustration on the right, a Bloom lter applied to the star particles
group has triggered a rasterization, so the emitter no longer intersects with images from
another group.
Note: Unlike vector graphics, rasterized 2D groups may lose quality when scaled if the Fixed
Resolution checkbox is selected in the Group Inspector.
In the following illustration on the left, the nonrasterized group that contains the replicator
intersects with an image from another group. In the illustration on the right, a Gradient Blur
lter applied to the replicator group has caused the replicator group to rasterize. As a result, the
replicator no longer intersects with the image from another group.
For more information on rasterization with 2D and 3D groups, see Groups and rasterization on
page 1045.
Filters and rasterization
The application of some lters can cause a group to be rasterized. When a group is rasterized, it
is converted into a bitmap image. In 2D groups, the application of any lter causes rasterization.
In 3D groups, the application of specic lters causes rasterization. For more information on
rasterization and 3D groups, see Groups and rasterization on page 1045.
67% resize factor