Controls how the force is combined with the incoming velocity field.

Applies a global scale to the force.

The acceleration due to gravity. Stronger gravity produces a stronger uniform force.

The direction in which the force is applied. In Drag mode, this value is treated as the target velocity.

Enables a limit on fluid acceleration in the direction of the uniform force.

Fluid with a velocity in the direction of the uniform force that is greater than or equal to this value will not have any force applied.

Turn on this parameter if the fluid accelerates more than desired due to the uniform force.

Increase this value if the uniform force stops affecting the fluid sooner than expected.

Scales the force by the timestep.

This ensures that the amount of force remains consistent when substepping occurs. Turn off this parameter if you need the instantaneous force value.

Mask out the effect using the threshold field. Threshold fields are intended to provide harsh on/off effects, but the range can be used to soften the transition.

The value of the threshold field is mapped from this range to 0-1 and applied as a multiplier on top of Scale. The default 0.01 to 0 range is designed to concentrate the effect on the edges and empty regions of the threshold field, but not inside it. When the threshold field is a Vector VDB, this value represents the length of the given vector field.

Turns on the Threshold Ramp, to change how the threshold field should scale the effect between the minimum and maximum values of Threshold Range.

This ramp controls how the threshold field values are mapped between the minimum and maximum values of Threshold Range.

Mask out the effect using the control field. Control fields are usually used the same way as masks, and represent a smooth engagement of the effect.

The value of the control field is mapped from this range to 0-1 and applied as a multiplier on top of Scale. The default 0 to 1 range is designed to concentrate the effect on regions with higher control field values. When the control field is a Vector VDB, this value represents the length of the given vector field.

Turns on the Control Ramp, to change how the control field should scale the effect between the minimum and maximum values of Control Range.

This ramp controls how the control field values are mapped between the minimum and maximum values of Control Range.

Mask out the effect by the angle between the velocity field values and a direction vector.

The reference vector used to calculate the angle deviation against the velocity field.

The value of the calculated angle is mapped until this angle range to 1-0 and applied as a multiplier on top of Scale. At the default 90 degrees, the effect is strongest where the vectors align, and gradually diminishes to zero as the angle reaches this value.

Turns on the Angle Control Ramp, to change how the angle deviation should scale the effect between the aligned vectors and the given Spread Angle.

This ramp controls how the angle deviation is mapped between the aligned vectors and the given Spread Angle.

Mask out the effect along an axis direction. Rather than requiring the construction of VDBs to represent this, this allows direct specification of the world space range over which the effect is to be scaled.

The reference vector along which the effect will be masked.

The position along the axis mask is mapped from this range to 0-1 and applied as a multiplier on top of Scale.

Turns on the Axis Control Ramp, to change how the position along the axis should scale the effect between the minimum and maximum values of Axis Range.

This ramp controls how the position is mapped between the minimum and maximum values of Axis Range.