Add Monster Spawn points, monster head placeholders. Add utility for prefab variation by sprite selection.

Assets/Scripts/Minigames/DivingForPictures/Monster.cs

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+using UnityEngine;
+using System;
+using System.Collections;
+
+namespace Minigames.DivingForPictures
+{
+    public class Monster : MonoBehaviour
+    {
+        [Header("References")]
+        [SerializeField] private CircleCollider2D detectionCollider;
+
+        private bool pictureAlreadyTaken = false;
+        private Camera mainCamera;
+
+        // Events
+        public event Action<Monster> OnPictureTaken;
+        public event Action<Monster> OnMonsterSpawned;
+        public event Action<Monster> OnMonsterDespawned;
+
+        // Properties
+        public float PictureRadius => detectionCollider != null ? detectionCollider.radius : 0f;
+
+        private void Awake()
+        {
+            if (detectionCollider == null)
+                detectionCollider = GetComponent<CircleCollider2D>();
+
+            mainCamera = Camera.main;
+
+            // Start checking if monster is off-screen
+            StartCoroutine(CheckIfOffScreen());
+        }
+
+        private void OnEnable()
+        {
+            pictureAlreadyTaken = false;
+            OnMonsterSpawned?.Invoke(this);
+        }
+
+        private IEnumerator CheckIfOffScreen()
+        {
+            WaitForSeconds wait = new WaitForSeconds(0.5f);
+
+            while (true)
+            {
+                yield return wait;
+
+                if (!IsVisibleToCamera())
+                {
+                    DespawnMonster();
+                    yield break;
+                }
+            }
+        }
+
+        private bool IsVisibleToCamera()
+        {
+            if (mainCamera == null)
+                mainCamera = Camera.main;
+
+            if (mainCamera == null)
+                return false;
+
+            Vector3 viewportPoint = mainCamera.WorldToViewportPoint(transform.position);
+            float buffer = 0.2f; // Extra buffer outside the screen
+
+            return viewportPoint.x > -buffer &&
+                   viewportPoint.x < 1 + buffer &&
+                   viewportPoint.y > -buffer &&
+                   viewportPoint.y < 1 + buffer;
+        }
+
+        private void OnTriggerEnter2D(Collider2D other)
+        {
+            // Check if it's the player
+            if (other.CompareTag("Player") && !pictureAlreadyTaken)
+            {
+                TakePicture();
+            }
+        }
+
+        // Called when a picture is taken of this monster
+        public void TakePicture()
+        {
+            if (pictureAlreadyTaken) return;
+
+            pictureAlreadyTaken = true;
+            OnPictureTaken?.Invoke(this);
+
+            DespawnMonster();
+        }
+
+        // Public method to despawn this monster
+        public void DespawnMonster()
+        {
+            if (gameObject.activeSelf)
+            {
+                OnMonsterDespawned?.Invoke(this);
+                gameObject.SetActive(false);
+                Destroy(gameObject);
+            }
+        }
+
+        // Visualization for the picture radius in editor
+        private void OnDrawGizmosSelected()
+        {
+            // Get the collider in edit mode
+            if (detectionCollider == null)
+                detectionCollider = GetComponent<CircleCollider2D>();
+
+            if (detectionCollider != null)
+            {
+                Gizmos.color = Color.yellow;
+                Gizmos.DrawWireSphere(transform.position, detectionCollider.radius / 2);
+            }
+        }
+
+#if UNITY_EDITOR
+        // Update collider radius in editor
+        private void OnValidate()
+        {
+            if (detectionCollider == null)
+                detectionCollider = GetComponent<CircleCollider2D>();
+        }
+#endif
+    }
+}