(Steam VR / Vive) Rigidbody moving in only one direction after collision

Questions & Answers
1

Hello all,

Currently I have a project setup with SteamVR and VRTK plugin. I pickup an object (an axe) using VRTK which is snapped onto a joint, connecting to the Vive controller. I have a script attached to the axe that will record it’s speed and velocity:

public float speed = 0;
Vector3 lastPosition = Vector3.zero;
public Vector3 velocity = Vector3.zero;

void Update()
{
    speed = (((transform.position - lastPosition).magnitude) / Time.deltaTime);
    lastPosition = transform.position;
    velocity = (transform.position - Vector3.zero) / Time.deltaTime;
}

Now, I have a Log object with a Rigidbody and colliders, it also has a script to handle collisions:

void OnTriggerEnter(Collider collider)
{
    if (!collider.gameObject.CompareTag("Blade"))
    {
        return;
    }

    Blade blade = collider.gameObject.GetComponentInParent<Blade>();

    if (blade.iObject.IsGrabbed() && blade.speed > 10.0f)
    {
        mRidgidBody.AddForce(blade. velocity * (blade.speed / 1));
    }
}

I’ve tried assigning the velocity of mRidgidBody as well as AddForce in the code above, but it seems there is a problem with the tracking of the axe blade’s velocity when the Log is hit, it always adds force in one direction.

Any suggestion would be appreciated.

EDIT: I was using Vector3.zero in the velocity, when I use lastPosition the Log doesn’t react to the force applied.

2

I was able to obtain the proper velocity and magnitude using:

VRTK_DeviceFinder.GetControllerVelocity(blade.controllerReference);