PhysX Force Operator

Impulse On Event Entry - Applies the force only once, when a particle enters the event. The value of the force applied is calculated as if the force is applied constantly for the period of time specified by the Time Warp value.

Important: When PhysX Shape is set to define mass by density, and PhysX Force > Force Type is set to Gravity (see preceding), do not use Impulse On Event Entry, as this can lead to simulation errors.

When off, forces are applied on a constant basis while particles are present in the event containing the PhysX Force operator. Impulse On Event Entry is useful when you need to apply force only when a particle enters the event, perhaps as a "jolt" or "impulse" to be applied to a particle to change its speed or spin.

• Time Warp - The duration over which the force is calculated when Impulse On Event Entry is on; this derived force is then applied instantaneously to each particle as it enters the event.

Example:  PhysXForce_ImpulseOnEventEntry.zip