Manually set particle attributes

The particle operators on the Attributes tab allow you to set different types of attributes on the particle system. You can also set or create arbitrary attributes to particles using the Attribute POP. This lets you store custom per-particle information relevant to your simulation you can use later in expressions.

Directly set motion attributes

A more low-level way to affect particle motion than applying forces is to set the position and/or motion (velocity, acceleration) attributes of particles directly.

To set particles'…	Use this operator
Position	Position POP
Velocity	Velocity POP
Acceleration	Acceleration POP
Torque	Torque POP

Note	The default rules that normally control the motion of particles based on their attributes will also be applied unless you turn them off with the Suppress Rule POP.

Tip	You can also set any arbitrary attribute, including the attributes set indirectly by the operators listed above, using the Attribute POP. Refer to the POP locals page to see the “standard” attributes you can set.