Wind

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Create panel > Helpers > reactor > Wind

menu bar > reactor > Create Object > Wind

reactor toolbar > Create Wind button

The Wind helper object lets you add wind effects to reactor scenes, allowing you, for instance, to make curtains flap in the breeze. After adding the helper to your scene, you can configure various properties for the effect such as its speed, gusts, and whether objects in your scene can be sheltered from the wind. You can animate most of these parameters. The orientation of the helper icon indicates the direction of the wind: It blows in the direction of the weathervane arrow. You can also animate this direction by animating the icon's orientation.

Procedures

To add wind to a scene:

Choose one of the above commands, and then click in any viewport to add the Wind helper.

Note: The icon’s position has no effect on the wind's behavior unless you activate the Use Range option.
Use the Rotate tool to rotate the icon and set the wind direction.

The wind blows in the direction indicated by the weathervane arrow.

Interface

Wind Properties rollout

Wind On—[Animatable] Defines whether the wind forces are applied or not.

Wind Speed—[Animatable] The strength of the wind force. The direction is specified by the icon's orientation, which is also animatable.

Perturb Speed—When on, the strength of the wind varies over time, using the following parameters.

Variance—The maximum amount of change in the speed.
Time Scale—How quickly speed change occurs, with small values producing slow changes, and large values producing rapid changes.

Ripple—[Animatable] When on, the wind direction becomes a function of space and time, allowing you to add rippling effects to cloth objects affected by the wind. This effect can occur in the Left/Right, Up/Down, or Back/Forward directions, where Forward is the wind direction and Up is the up-axis of the wind icon.

Magnitude—The directional variance for the ripples.
Frequency—The regularity of ripple formation.
Perturb Time—When in, the spatial perturbation is itself perturbed over time, meaning that the ripples move back and forth. The Perturb Time feature has its own Magnitude and Frequency parameters. When off, the rippling cloth should eventually come to rest, unless Perturb Speed is on.

Use Range—[Animatable] When on, the wind effect has the specified range of action, starting from the icon. The range limit is displayed in the viewport, as depicted in the following illustration.

Fall Off—The extent to which the wind effect falls off towards its range limit. You can choose from None, Inv (strength decreases proportionally to distance), and Inv Sq (strength decreases proportionally to the square of the distance).

Enable Sheltering—[Animatable] When on, objects can be sheltered from the wind by other objects.

Applies To—These check boxes allow you to specify the types of objects that are affected by the wind. You can choose from Rigid Bodies, Cloth, Soft Bodies, and Ropes.

Disabled—Removes the wind from the simulation.

Display—The size of the wind icon in the viewports.

Reset Default Values—Resets the default property values for this Wind helper.