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unity/Assets/Light/scripts/LightSource.cs

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+using UnityEngine;
+
+namespace IndianOceanAssets.Engine2_5D
+{
+    /// <summary>
+    /// 光源组件（方案B用）—— 挂到任何需要发光的物体上。
+    /// 向 LightMaskSystem 注册自己的世界坐标、半径、强度。
+    /// 不创建真实的 Point Light，而是由 DarknessOverlay shader 在遮罩层挖洞。
+    /// </summary>
+    public class LightSource : MonoBehaviour
+    {
+        [Header("光源参数")]
+        [SerializeField] private float radius = 4f;       // 光照半径（世界单位）
+        [SerializeField] private float intensity = 1f;    // 光照强度 (0~1)
+        [SerializeField] private bool registerOnStart = true;
+
+        [Header("可选：目标跟随（留空则跟随自身）")]
+        [SerializeField] private Transform followTarget;
+
+        [Header("闪烁效果")]
+        [SerializeField] private bool enableFlicker = false;
+        [SerializeField] private float flickerSpeed = 5f;
+        [SerializeField] private float flickerAmount = 0.2f;
+
+        private float baseIntensity;
+        private float noiseSeed;
+
+        private void Start()
+        {
+            baseIntensity = intensity;
+            noiseSeed = Random.Range(0f, 100f);
+
+            if (registerOnStart && LightMaskSystem.Instance != null)
+                LightMaskSystem.Instance.RegisterLight(this);
+        }
+
+        private void Update()
+        {
+            if (enableFlicker)
+            {
+                float noise = Mathf.PerlinNoise(Time.time * flickerSpeed, noiseSeed);
+                intensity = baseIntensity + (noise - 0.5f) * 2f * flickerAmount;
+                intensity = Mathf.Clamp01(intensity);
+            }
+        }
+
+        /// <summary>
+        /// 返回光源在世界坐标的位置（XZ 平面）
+        /// </summary>
+        public Vector2 GetWorldPositionXZ()
+        {
+            Transform t = followTarget != null ? followTarget : transform;
+            return new Vector2(t.position.x, t.position.z);
+        }
+
+        public float Radius => radius;
+        public float Intensity => intensity;
+
+        public void SetIntensity(float value)
+        {
+            baseIntensity = Mathf.Clamp01(value);
+            intensity = baseIntensity;
+        }
+
+        public void SetRadius(float value)
+        {
+            radius = Mathf.Max(0.1f, value);
+        }
+
+        /// <summary>
+        /// 平滑过渡半径（如 Q 键过场时光圈逐渐扩大）
+        /// </summary>
+        public void LerpRadius(float target, float speed)
+        {
+            radius = Mathf.Lerp(radius, target, Time.deltaTime * speed);
+            radius = Mathf.Max(0.1f, radius);
+        }
+
+        /// <summary>
+        /// 平滑过渡强度（如玩家受伤时光变暗、靠近篝火时光变亮）
+        /// </summary>
+        public void LerpIntensity(float target, float speed)
+        {
+            baseIntensity = Mathf.Lerp(baseIntensity, Mathf.Clamp01(target), Time.deltaTime * speed);
+            intensity = baseIntensity;
+        }
+
+        private void OnEnable()
+        {
+            if (LightMaskSystem.Instance != null)
+                LightMaskSystem.Instance.RegisterLight(this);
+        }
+
+        private void OnDisable()
+        {
+            if (LightMaskSystem.Instance != null)
+                LightMaskSystem.Instance.UnregisterLight(this);
+        }
+
+        private void OnDestroy()
+        {
+            if (LightMaskSystem.Instance != null)
+                LightMaskSystem.Instance.UnregisterLight(this);
+        }
+    }
+}