• Editor

  • Can the Wind Effect in Physics Constraint Be Affected by Scale -1?

Hi everyone, I'm using Spine's Physics Constraint with the Wind effect on my character's hair, but it seems like it can't be mirrored when the scale is set to -1. When my character runs left and right, I directly use skeletonAnimation.skeleton.ScaleX = 1;. This results in the hair blowing backwards normally when running left, but it looks strange when running right because the hair blows forward. Is there any way to fix this? Thank you!

Related Discussions
...

When you set the scale to -1 to flip your character, the wind effect in the Physics Constraint does not automatically mirror. This is because the wind direction is not inherently tied to the character's scale. To achieve the desired effect, you need to manually adjust the wind direction based on the character's scale.

Here is a possible solution:

  1. Check the Scale: Determine if the character is flipped by checking the ScaleX value.
  2. Adjust Wind Direction: If the character is flipped (i.e., ScaleX is -1), reverse the wind direction.

Here is a code snippet to illustrate this:

void Update() {
    // Assuming you have a reference to your skeleton animation
    var skeleton = skeletonAnimation.skeleton;

    // Check if the character is flipped
    if (skeleton.ScaleX < 0) {
        // Reverse the wind direction
        physicsConstraint.windX = -originalWindX;
        physicsConstraint.windY = -originalWindY;
    } else {
        // Use the original wind direction
        physicsConstraint.windX = originalWindX;
        physicsConstraint.windY = originalWindY;
    }
}

In this example, originalWindX and originalWindY are the original wind direction values you want to use when the character is not flipped.

By adjusting the wind direction based on the character's scale, you can ensure that the hair blows in the correct direction regardless of whether the character is facing left or right.

Thanks bot but how to access the specific physicsConstraint in my skeleton?

Here is the list of all physics constraints:
http://esotericsoftware.com/spine-api-reference#Skeleton-physicsConstraints
Here you can find a physics constraint by name (cache the result):
http://esotericsoftware.com/spine-api-reference#SkeletonData-findPhysicsConstraint

Note if you keyed wind in animations, applying such an animation will override your wind change. You can make the change after applying animations each frame.