HTC VIVE Tracker 3.0 - Page 30

VIVE Tracker (3.0)
HTC Corporation
Developer Guidelines
V1.0
12/16/2020
27 HTC Confidential and Proprietary
Another Unity sample code shows how to transform the accessory by comparing vectors
parallel to y-axis and z-axis of the VIVE Tracker (3.0) (AxisY_Tracker, AxisZ_Tracker in the
example below) and the accessory (AxisY_Accessory, AxisZ_Accessory in the example
below).
public class Accessory: MonoBehaviour {
const Vector3 AxisY_Tracker = new Vectors(AxisY_Tracker_X,
AxisY_Tracker_Y, AxisY_Tracker_Z);
const Vector3 AxisZ_Tracker = new Vectors(AxisZ_Tracker_X,
AxisZ_Tracker_Y, AxisZ_Tracker_Z);
const Vector3 AxisY_Accessory = new Vectors(AxisY_Accessory_X, AxisY_
Accessory _Y, AxisY_ Accessory _Z);
const Vector3 AxisZ_ Accessory = new Vectors(AxisZ_Accessory_X,
AxisZ_ Accessory _Y, AxisZ_ Accessory _Z);
void Update () {
//Calculate delta rotation by comparing vectors parallel to Y
axes of Tracker and the accessory
Quaternion delta_rotY = Quaternion.FromToRotation(AxisY_Tracker,
AxisY_Accessory);
AxisZ_Tracker = delta_rotY * AxisZ_Tracker;
Quaternion delta_rotZ = Quaternion.FromToRotation(AxisZ_Tracker,
AxisZ_Accessory);
//Collect delta rotation and displacement between Tracker and
Accessory
Vector3 delta_displacement = new Vector3(dX, dY, dZ);
Quaternion delta_rotation = delta_rotZ * delta_rotY;
//Get current Tracker pose
Vector3 tracker_position =
SteamVR_Controller.Input(3).transform.pos;
Quaternion tracker_rotation =
SteamVR_Controller.Input(3).transform.rot;
//Transform current Tracker pose to Accessory pose
GameObject.Find("Accessory").transform.rotation = delta_rotation
* tracker_rotation;
GameObject.Find("Accessory").transform.position =
tracker_position + (delta_rotation * tracker_rotation) *
delta_displacement;
}
}