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as the source geometry over which particles form, or the source geometry used
to create particles that appear to be fragments of the object.
Object text field Displays the name of the picked object.
Particle Formation group
These options determine how standard particles are initially distributed over
the surface of the object-based emitter. These controls are available only when
the picked object is used as a distribution grid for standard particles,
MetaParticles, or instanced geometry; see
Particle Type rollout on page 3053.
When Object Fragments is chosen in the Particle Type rollout, these controls
are unavailable.
Over Entire Surface Emits particles randomly over the entire surface of the
object-based emitter. This is the default choice.
Along Visible Edges Emits particles randomly from the visible edges of the
object.
At All Vertices Emits particles from the vertices of the object.
At Distinct Points Places a specified number of emitter points randomly over
the surface of the object.
Total Specifies the number of emitter points used when At Distinct Points is
chosen.
At Face Centers Emits particles from the center of each triangular face.
Use Selected SubObjects With mesh-based emitters, and to a limited extent
with patch-based emitters, limits the source of the particle stream to the
sub-object selection passed up the modifier stack in the object-based emitter.
For example, if your emitter object is a cylinder converted to an editable mesh,
and the top cap of that cylinder is selected at the Face or Polygon sub-object
level, if Use Selected SubObjects is on and Particle Formation group > At Face
Centers is on, the particles will stream only from the top cap of the cylinder.
Default=off.
The type of particle formation you specify determines the type of sub-object
geometry used, as follows:
■ Over Entire Surface Faces
■ Along Visible Edges Edges
■ At All Vertices Vertices
■ At Distinct Points Faces
Non-Event-Driven Particle Systems | 3047