The Group Operator applies an entire event to the particles specified by one or more . The Group Operator is useful when you want to apply an event to a subset of particles, but you don't want to split the particles from the current event. It affects the selected particles only while they remain in the current event.
This operator is useful when you want to apply a complex event to a subset of particles. It is also useful when you want to apply the same series of operators to different subsets of particles in different events.
Group operator is not wired to the event that it calls.
In the Particle Flow network shown above, all particles in Event 01 that pass the Age test are directed to Event 02, but only those that were selected by the Group Selection operator in Event 02 will use the operators in the Rotation event. Then all particles that flowed to Event 02 (including both the particles selected with the Group Selection operator, and those not selected) are directed to Event 03 via the Spawn test.
To add one or more groups, click the Add button and use the Select Group Selection Operator dialog to specify the groups to add. To remove a group from the list, highlight its name and then click Remove