add subfolder structure

Assets/Escape Room Engine/Portal/Scripts/Portal.cs

@@ -0,0 +1,82 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Escape_Room_Engine.Portal
+{
+    [RequireComponent(typeof(Collider))]
+    public class Portal : MonoBehaviour
+    {
+        public static readonly Matrix4x4 HalfRotation = Matrix4x4.Rotate(Quaternion.Euler(0, 180, 0));
+        
+        /// <summary>
+        /// The portal that is connected with this one.
+        /// </summary>
+        public Portal linkedPortal;
+        /// <summary>
+        /// The camera that will draw the view for this portal.
+        /// </summary>
+        public PortalCamera portalCamera;
+
+        private readonly List<PortalDriver> _closePortalDrivers = new();
+
+        private void Awake()
+        {
+            // check whether the other portal is set up
+            if (!linkedPortal || linkedPortal.linkedPortal != this) throw new Exception("Other portal not set up correctly.");
+            
+            // check whether the collider is set up correctly
+            if (!GetComponent<Collider>().isTrigger) throw new Exception("Collider must be a trigger.");
+        }
+
+        private void FixedUpdate()
+        {
+            for (var i = 0; i < _closePortalDrivers.Count; i++)
+            {
+                var portalDriver = _closePortalDrivers[i];
+                if (portalDriver.entrySide < 0 && CalculateSide(portalDriver.transform) >= 0) // must have entered from the front and exited the back
+                {
+                    StopTrackingDriver(portalDriver);
+                    linkedPortal.StartTrackingDriver(portalDriver, -1);
+                    portalDriver.Teleport(this, linkedPortal);
+                    i--; // decrease the loop counter because the list is one element smaller now
+                }
+            }
+        }
+
+        private void StartTrackingDriver(PortalDriver portalDriver, int entrySide)
+        {
+            _closePortalDrivers.Add(portalDriver);
+            portalDriver.EnableClone(linkedPortal);
+            portalDriver.entrySide = entrySide;
+        }
+
+        private void StopTrackingDriver(PortalDriver portalDriver)
+        {
+            _closePortalDrivers.Remove(portalDriver);
+            portalDriver.DisableClone(linkedPortal);
+        }
+
+        private void OnTriggerEnter(Collider other)
+        {
+            var portalDriver = other.GetComponent<PortalDriver>();
+            if (portalDriver && !_closePortalDrivers.Contains(portalDriver))
+            {
+                StartTrackingDriver(portalDriver, CalculateSide(portalDriver.transform));
+            }
+        }
+
+        private void OnTriggerExit(Collider other)
+        {
+            var portalDriver = other.GetComponent<PortalDriver>();
+            if (portalDriver)
+                StopTrackingDriver(portalDriver);
+        }
+
+        private int CalculateSide(Transform portalDriverTransform)
+        {
+            var t = transform;
+            return Math.Sign(Vector3.Dot(t.forward, portalDriverTransform.position - t.position));
+        }
+    }
+}