added unseen event triggers

game/Assets/Prefabs/Puzzles/Boost/Boost Rooms.prefab

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game/Assets/Scripts/Util/Events/UnseenEventTrigger.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.Events;
+
+namespace Ktyl.Util
+{
+    public class UnseenEventTrigger : MonoBehaviour
+    {
+        [System.Serializable]
+        private struct Event
+        {
+            public GameEvent game;
+            public UnityEvent unity;
+
+            public void Raise()
+            {
+                if (game) game.Raise();
+                unity.Invoke();
+            }
+        }
+
+        [SerializeField]
+        private float _minDistance = 2f;
+
+        [SerializeField]
+        [Range(0f, 180f)]
+        private float _minAngle = 90.0f;
+        
+        [SerializeField] private Event _onUnseen;
+        
+        private bool _isArmed = false;
+        private Camera _camera;
+
+        public void Disarm()
+        {
+            _isArmed = false;
+        }
+
+        public void Arm()
+        {
+            _isArmed = true;
+        }
+            
+        private void Update()
+        {
+            if ( !_isArmed )
+                return;
+
+            if ( !IsUnseen() )
+                return;
+            
+            _onUnseen.Raise();
+
+            _isArmed = false;
+        }
+
+        private bool IsUnseen()
+        {
+            // lazy init camera
+            if ( _camera == null )
+            {
+                _camera = Camera.main;
+            }
+
+            var camDiff = transform.position - _camera.transform.position;
+            
+            // distance check
+            if ( camDiff.sqrMagnitude < _minDistance * _minDistance )
+            {
+                // too close!
+                return false;
+            }
+            
+            // angle check
+            float angleDiff = Vector3.Angle( camDiff.normalized, _camera.transform.forward );
+            if ( angleDiff < _minAngle )
+            {
+                return false;
+            }
+            
+            return true;
+        }
+    }
+}

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