This page provides information on the PlainForce component.


Page Contents


The PlainForce helper object is a force that pushes a fluid according to the helper's orientation. PlainForce is used to produce a gravity or a wind effect. The dynamics are controlled by two parameters that balance between predictability and natural behavior: force magnitude (Strength) and Drag.



Strength | strength – Specifies the acceleration force measured in scene units/sec^2.

Drag | drag – Specifies a value between 0 and 1 to determine how much of the existing velocity will be negated over the period of 1 second. The bigger the drag, the more the fluid behavior is suppressed and the less the fluid features are pronounced. A value of 1.0 stops the fluid's motion.

Max Distance | maxdist – Specifies the distance where the force disappears.

Fade Start | fadestart – Specifies the relative distance (as part of the Max Distance) where the force starts to gradually decline.

Affect | affect – Specifies the affected components of the simulation separated by commas. Note that if in a Fire/Smoke simulation all voxels will be affected uniformly by the Plain Force, while in a Liquid simulation you can choose which kinds of particles will be influenced. The supported elements are:

Liquid - affects the Liquid particles in a Liquid simulation.
Splashes - affects the Splash particles in a Liquid simulation.
Foam - affects the Foam particles in a Liquid simulation.
Mist - affects the Mist particles in a Liquid simulation.
- affects the space in a Liquid simulation where there are no Liquid particles, when Simulate Air Effects is enabled in the Dynamics rollout. All particles such as Foam, Splash or Mist outside the liquid volume will be influenced.

Affect Names are not case sensitive and any unknown element found in the list is ignored.

Apply Force Behind Icon | applyforcebehind – When enabled, the force will be applied behind the helper icon.

Terminal velocity – The velocity at which the acceleration caused by the force (Strength) is equal to the deceleration caused by the drag.