PortalsInUnity/PortalCamera.cs at master · JustinDavisA/PortalsInUnity · GitHub

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using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PortalCamera : MonoBehaviour {

    public Transform playerCamera;
    public Transform portal;
    public Transform otherPortal;

	// Update is called once per frame
	void Update ()
    {
        Vector3 playerOffsetFromPortal = playerCamera.position - otherPortal.position;
        transform.position = portal.position + playerOffsetFromPortal;

        float angularDifferenceBetweenPortalRotations = Quaternion.Angle(portal.rotation, otherPortal.rotation);

        Quaternion portalRotationalDifference = Quaternion.AngleAxis(angularDifferenceBetweenPortalRotations, Vector3.up);
        Vector3 newCameraDirection = portalRotationalDifference * playerCamera.forward;
        transform.rotation = Quaternion.LookRotation(newCameraDirection, Vector3.up);
	}
}