public virtual void Teleport(Transform fromPortalTransform, Transform toPortalTransform)
{
// get relative difference between two rotations (i.e. the quaternion that would turn this rotation into that rotation)
// so say we want quaternion d which we can use like so: d * q1 = q2
// knowing how we want to use it, we can thus caluclate it as: d = q2 * inverse(q1)
Quaternion relativeDiff = toPortalTransform.rotation * Quaternion.Inverse(fromPortalTransform.rotation);
relativeDiff *= Quaternion.Euler(0, 180, 0); // we also need to rotate an extra 180 deg because one portal's render planes are facing opposite directions
Vector3 positionOffset = transform.position - fromPortalTransform.position;
positionOffset = relativeDiff * positionOffset;
// position
transform.position = toPortalTransform.position + positionOffset;
// rotate
if (fpsController != null)
{
fpsController.Rotate(relativeDiff);
}
else
{
gameObject.transform.rotation *= relativeDiff;
}
}