2009

Use Parallel Direction When off, all particles continuously rotate to stay
facing toward the Look At object. Each particle's orientation varies because
its location differs from those of the others. When on, all particles face in the
same direction, defined by an imaginary line between the Particle Source
gizmo center and the Look At object. Default=off.
Size/Width group
Use these settings to specify the coordinate system for setting the size, as well
as the size parameters. The numeric settings in this group are not animatable.
In World Space Sets the absolute size in system units, using the World
coordinate system.
Units With the In World Space option, sets the particle size in system units.
Range=0 to 1000000000. Default=1.
In Local Space Sets particle size relative to the existing size, in local space.
The software uses the dimensions of the existing shape to determine the size
of the “facing rectangle.”
Inherited % Sets the facing particles' size as a percentage of the existing size.
Range=0 to 100. Default=100.
In Screen Space Sets the facing particles' size as a percentage of the screen
width. The actual size of each particle changes as necessary throughout the
animation, depending its distance from the camera, to maintain a constant
size from the camera's point of view.
This option is available only when the Look At object is a camera, and Use
Parallel Direction is off.
Proportion % Sets the particle size as a percentage of the screen width.
Default=1.
Variation % Sets the percentage by which particle size can vary. Default=0.
Pivot At Specifies the part of the particle around which rotation is performed
when maintaining the facing direction. The choices, available from the
drop-down list, are Top, Center, and Bottom. Default=Center.
With Top and Bottom, the center of the corresponding side is used as the
particle center for rotation.
This option is useful, for example, when particles are lying on a surface, and
each particle is an explosion. In this situation, you'd probably want the entire
particle rectangle to appear above the surface, so you'd set Pivot At to Bottom.
W/H Ratio Defines the aspect (width-to-height) ratio of the shape rectangle.
Particle Flow | 2903