Wind Parameter
Updated: 02/18/2025
This page explains the wind parameters in the physics simulation of the Cubism AE Plugin.
The wind parameter is a feature introduced in Cubism 5 AE Plugin R5 beta1.
By applying the [Wind] parameter to the model’s physics simulation, it is possible to express effects such as wind.
It supports both real-time and animation bake modes.
Enabling the Wind Parameter
Open the [Live2D Cubism Renderer] effect for the model layer where the animation is set. Then, navigate to [Physics] → [Wind], and turn on “Realtime”.
Checking [Enable] will activate the [Wind] parameter, allowing it to be reflected in the physics simulation.
TIPS
To bake the wind parameter results and apply them to keyframes, you need to execute [Execute].
Wind Parameter Settings
There are two configuration options for the wind parameter.
Max Force
Sets the maximum force that the wind applies to the physics simulation.
The optimal value varies depending on the model’s physics settings.
By default, it is set to 5.0.
Force Multiplier
Defines the magnitude and direction of the force applied by the wind.
The value of this parameter is multiplied by [Max Force], and the result is applied to the physics simulation.
It can be set within a range of -100% to 100%. A negative value reverses the wind direction.
Setting the Optimal Max Force Value
To configure the optimal wind parameters, you need to set the Max Force value individually for each model.
This is because the ideal value varies depending on the physics simulation settings.
1. Turn on [Realtime]
This allows the physics simulation to react in real time.
2. Set [Force Multiplier] to 100%
Temporarily set the [Force Multiplier] to 100% to apply wind force.
(If you want to apply force in the opposite direction, set it to -100%.)
3. Gradually increase [Max Force] from 0
Start with [Max Force] set to 0, then gradually increase the value until you reach the optimal setting.
Find the value where the oscillation reaches its maximum and no longer changes significantly.
TIPS
If the [Max Force] value is set too high, the parameters may exceed their limits, causing jerky movements.
It is best to set the [Max Force] value just below the point where motion changes stop occurring.
Example Usage of the Wind Parameter
By setting the [Force Multiplier] value to 100% for only a few frames, you can create an effect where wind blows against the model.
Furthermore, by using expressions to apply random or periodic values to [Force Multiplier], you can make the character’s hair continuously sway in the wind over time.
Example: wiggle(5,50)
Since [Force Multiplier] is set to 0, it will randomly fluctuate within a ±50% range 5 times per second.
By baking the wind parameter using [Execute], you can confirm that the hair moves randomly.
If the movement becomes excessive and appears choppy, try adjusting the [Max Force] value to smooth it out.
Adjusting the Oscillation of Specific Output Parameters
If you want to exclude certain parts from being affected by the wind parameter or adjust the strength selectively, modify the physics simulation intensity.
You can adjust the oscillation of specific output parameters by navigating to [Physics] → [Output] → [Parameters].
In the following video, the influence on the brim of the hat is being adjusted.
For more details, please refer to “About Physics Simulation“.