Question WindSpeed float needs to be changed with Player direction

I have in my Game calculations with WindSpeed.

Code (CSharp):

1. realWindSpeed_kmh

as a float
i set this random at the start between -20 and +20
So i have Wind
Now the player moves in a direction - North, South, West, East.
When i start the game the player moves with 15 KmH front Wind for example in direction north.
When the player turns to direction South, the wind cannot be 15Km/h now it should be -15Km/H
The direction of the player i can get with:

Code (CSharp):

1. playerTransform.eulerAngles.y;

How can i calculate the WindSpeed with the current direction?

 

You'll want to represent the windspeed as a Vector3. It is a vector because it has magnitude and direction, not just magnitude.

Then you can easily convert the wind vector into the player's local coordinate system with:
https://docs.unity3d.com/ScriptReference/Transform.InverseTransformDirection.html

If you want a single number representing how fast the wind is in the the player's forward direction, you'd use the dot product on the wind vector and your player's forward direction:

transform.forward

. https://docs.unity3d.com/ScriptReference/Vector3.Dot.html (this would be how to get the -15 from your original question).

 

I do know with som ehelp:

Code (CSharp):

1. public void CalculateWind()
2.     {
3.         Vector3 forward = playerTransform.forward;
4.         Vector3 windDirection = windig.direction;
5.         float windStrength = -Vector3.Dot(forward, windDirection) * windig.strength;
6.         bicycleController.windSpeed = windStrength;
7.         Debug.Log("Windig" + windStrength.ToString("F0"));
8.     }