Trapcode Particular
The Kaleidospace group adds 3D symmetry to a particle system.
Mirror Mode Checkboxes: Defines the symmetry axes.
From left to right, Mirror is Off, Mirror X, Mirror Y, Mirror Z with position z set to 500 pixels back, and Mirror X and Y.
Behavior pop-up: Defines the symmetry operation.
Behavior is set to Mirror and Remove (left) and Mirror Everything (right).
Center Position : Defines the symmetry center with x/y/z coordinates. Coordinates take effect when the corresponding Mirror value is checked (i.e., z position will adjust when Mirror on Z is selected).