make apply force direction change with camera

Hello,
I'm working on making a ball move around in 3d, from a 3rd person view

I have a Freelook camera assigned and I'm working on creating some camera control to rotate around the player.

I'm running into the issue where my ApplyForce function for movement is relative to the X and Z vectors of the scene.

I want what the ApplyForce function *perceives* as X and Y to be from the camera orientation, not from what they are with the scene.

 

Steps:

- put the X/Z values in a Vector3

- get the angular heading of the camera

- multiply the X/Z values by the rotation of the camera

- use the resulting rotated X/Z vector

The middle two steps would be something like

Code (csharp):

1. var WorldXZ = new Vector3(inputX, 0, inputY);
2.  
3. var CameraHeading = MyCamera.transform.eulerAngles.y;
4.  
5. var LocalXZ = Quaternion.Euler( 0, CameraHeading, 0) * WorldXZ;
6.  
7. // now use LocalXZ to move

If you want to see it in action, check my proximity_buttons project. Look in the

DemoCameraRotatedControls

scene.

proximity_buttons is presently hosted at these locations:

https://bitbucket.org/kurtdekker/proximity_buttons

https://github.com/kurtdekker/proximity_buttons

https://gitlab.com/kurtdekker/proximity_buttons

https://sourceforge.net/projects/proximity-buttons/

 

Thanks so much for the response!
....I don't know what a lot of this means!
I see that this is creating a variable that uses the camera rotation, and that I need to incorporate LocalXZ into my script somewhere, I'm just not sure where exactly.

public class VelocityMove : MonoBehaviour
{
public float force = 1.0f;

Rigidbody rb;

private void Start()
{
rb = GetComponent<Rigidbody>();

}


void FixedUpdate()
{
float xMov = Input.GetAxisRaw("Horizontal") * force;
float zMov = Input.GetAxisRaw("Vertical") * force;



rb.AddForce(xMov, 0, zMov, ForceMode.Impulse);

}
}

 

Got it! Thank you!

 

Awesome! And if you reply with your fully-functional snippet of code below, perhaps someone else in the future can benefit!

 

Needs cleaned a little, but is functional
{
public float force = 1.0f;

Rigidbody rb;
public Camera MainCamera;


private void Start()
{
rb = GetComponent<Rigidbody>();
MainCamera = Camera.main;
}





void FixedUpdate()
{

float xMov = Input.GetAxisRaw("Horizontal") * force;
float zMov = Input.GetAxisRaw("Vertical") * force;

Vector3 WorldXZ = new Vector3(xMov, 0, zMov);

var CameraHeading = MainCamera.transform.eulerAngles.y;

var LocalXZ = Quaternion.Euler(0, CameraHeading, 0) * WorldXZ;

rb.AddForce(LocalXZ, ForceMode.Impulse);

}
}

 

built for xbox controller
https://simmer.io/@ShaunLK3/ball-test