private PortalUser _portalUser; //###:TODO - really need a list or map of these, so multiple objects can be colliding with the portal at once (e.g,. large rectangle entres but does not teleport thorugh portal; then sphere enters)
void FixedUpdate() //https://docs.unity3d.com/ScriptReference/MonoBehaviour.FixedUpdate.html "FixedUpdate should be used instead of Update when dealing with Rigidbody" (so, for physical objects, you might want this)
{
if (_portalUser != null)
{
var currentDot = Vector3.Dot(transform.up, _portalUser.transform.position - transform.position);
if (currentDot < 0) // only transport the player once they've moved across plane
{
// transport them to the equivalent position in the other portal
Vector3 playerRelativeToPortalPosLocal = transform.InverseTransformPoint(_portalUser.transform.position);
playerRelativeToPortalPosLocal.x = -playerRelativeToPortalPosLocal.x; //Prevent "mirroring"
playerRelativeToPortalPosLocal.y = -playerRelativeToPortalPosLocal.y; //We have penerated the sender portal; need to "pop out of" the receiver portal; we use y-axis as forward as collision plane has a -90 degree rotation in X, which transposes Y, which we'd normally use, into X
var newPosition = receiver.transform.TransformPoint(playerRelativeToPortalPosLocal);
// And sort out new camera facing
var receiverForwardAxis = receiver.transform.up; //Collision-plane has a rotation of -90 in X, which transposes the axes we'd normally consider
var senderForwardAxis = transform.up; //Collision-plane has a rotation of -90 in X, which transposes the axes we'd normally consider
var receiverUpAxis = receiver.transform.forward; //Collision-plane has a rotation of -90 in X, which transposes the axes we'd normally consider
var portalRotationalDifference = Quaternion.FromToRotation(senderForwardAxis, -receiverForwardAxis); //https://answers.unity.com/questions/702200/finding-the-rotation-between-two-gameobjects.html
var newFacingDirection = portalRotationalDifference * _portalUser.transform.forward;
var newRotation = Quaternion.LookRotation(newFacingDirection, receiverUpAxis);
_portalUser.Teleport(newPosition, newRotation);
_portalUser = null;
}
}
}
