Added basic portals

Assets/Scripts/World/PortalManager.cs

@@ -0,0 +1,62 @@
+using UnityEngine;
+
+namespace InterfaceOff.WorldScene
+{
+    public class PortalManager : MonoBehaviour
+    {
+        [Header("References")]
+        [SerializeField] GameObject m_OtherPortal;
+        [SerializeField] Camera m_PlayerCamera;
+
+        [Header("Set References")]
+        [SerializeField] GameObject m_CameraPrefab;
+        [SerializeField] MeshRenderer[] m_Renderers;
+        [SerializeField] Transform m_PlayerPoint;
+
+        // Private variables //
+
+        PortalManager m_OtherManager;
+        [SerializeField] PortalCamera m_PortalCamera;
+
+        // Gets the other end of the portal
+        public PortalManager Linked() => m_OtherManager;
+
+        // Gets the location of the player relative to the portal
+        public Vector3 PlayerOffset() => m_PlayerPoint.localPosition;
+
+        // Start is called before the first frame update
+        void Start()
+        {
+            // Validates that it is a portal
+            m_OtherManager = m_OtherPortal.GetComponentInChildren<PortalManager>();
+            if (m_OtherManager == null)
+            {
+                Debug.LogError("OtherPortal was not valid portal");
+                return;
+            }
+
+            // Creates the camera in top-level heirachry and stores the PortalCamera script
+            GameObject cam = Instantiate(m_CameraPrefab, transform.root.parent);
+            m_PortalCamera = cam.GetComponentInChildren<PortalCamera>();
+
+            // Initialises the camera so it renders to the portal and not the screen
+            m_PortalCamera.InitCamera(m_Renderers, this, transform.parent.localEulerAngles * 2.0f);
+        }
+
+        void LateUpdate() => m_PlayerPoint.position = m_PlayerCamera.transform.position;
+
+        // When something enters the portal
+        private void OnTriggerEnter(Collider other)
+        {
+            // Changing the state if it is not the player will cause issues
+            if (!other.CompareTag("Player"))
+            {
+                return;
+            }
+
+            // Calculates if the player is going towards the portal
+            Vector3 difference = m_PlayerCamera.transform.position - transform.position;
+            PlayerController.SetPos(m_OtherManager.transform.position + difference - new Vector3(0, 1.0f, 0));
+        }
+    }
+}