2009

TIP You can use this option to confine particles to the interior of an object. Position
the emitter inside the object, designate the object as the Surface Geometry, choose
Control Speed Continuously, and choose Out Of Surface. Each time a particle
comes close to a surface, it turns to travel directly away from the surface. Control
the particles' travel range with the Speed setting, but keep in mind that particles
moving very fast might “escape” their container. If this happens, increase the
Accel Limit setting; this lets the particles turn more quickly.
Parallel To Surface Each particle travels parallel to the nearest face.
To make particles orbit an object, use this with Control Speed Continuously,
and set appropriate Continuous Speed Control values (see the following
section).
Divergence When on, spreads out the particle stream. Use the numeric setting
to define the extent of the divergence. Range=0 to 180. Default=0. The value
can be animated.
This option is unavailable if Control Speed Continuously is chosen.
TIP For a fountain-like spray, set Position > Location to Pivot, set Direction to
Along Icon Arrow, set Divergence to the desired angle, and rotate the icon so its
arrow points upward.
Continuous Speed Control group
When you choose the Control Speed Continuously option, these controls
become available. Basically, these controls let the particles move about within
the region of the Surface Geometry object rather than in a straight line away
from the emitter.
Accel Limit Sets the maximum acceleration. The higher this value, the more
quickly particles can turn and change speed.
TIP Use a lower Accel Limit value for smooth motion, and a higher value when
greater accuracy is needed, such as when the particles should hit a small target.
You can animate this setting (use Sync By > Event Duration) to specify different
appropriate values, depending on the required results.
Unlimited Range When on, the surface controls speed and direction of
particles at any distance. When off, particles must be within a specified range.
Default=on.
Range The maximum distance, in system units, between the particles and
controlling surface. The Surface Geometry will not control particles beyond
this distance.
Particle Flow | 2893