61 lines
2.0 KiB
C#
61 lines
2.0 KiB
C#
using UnityEngine;
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namespace IndianOceanAssets.Engine2_5D
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{
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/// <summary>
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/// 场景物件面向摄像机脚本（饥荒风格）。
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/// 让物体始终朝摄像机方向旋转，默认只绕 Y 轴（保持竖直不倒）。
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///
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/// 用法：挂到需要面向摄像机的精灵/物件上即可。
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/// 适合：树木、岩石、角色、道具等 2D 精灵在 3D 场景中的朝向修正。
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/// </summary>
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public class BillboardSprite : MonoBehaviour
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{
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[Tooltip("只绕Y轴旋转（饥荒风格，保持竖直不倒）。关闭则完全面向摄像机。")]
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[SerializeField] private bool lockYAxis = true;
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[Tooltip("平滑旋转（lerp过渡），关闭则瞬间转向")]
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[SerializeField] private bool smoothRotation = false;
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[Tooltip("平滑旋转速度")]
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[SerializeField] private float rotationSpeed = 8f;
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private Camera _mainCamera;
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private Transform _camTransform;
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private void Start()
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{
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_mainCamera = Camera.main;
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if (_mainCamera != null)
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_camTransform = _mainCamera.transform;
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}
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private void LateUpdate()
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{
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if (_camTransform == null)
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{
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// 摄像机丢失时重新获取（场景切换等情况）
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_mainCamera = Camera.main;
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if (_mainCamera != null)
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_camTransform = _mainCamera.transform;
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if (_camTransform == null) return;
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}
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Vector3 dir = _camTransform.position - transform.position;
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if (lockYAxis)
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dir.y = 0f; // 保持竖直
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if (dir.sqrMagnitude < 0.0001f) return;
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Quaternion targetRot = Quaternion.LookRotation(dir);
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if (smoothRotation)
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transform.rotation = Quaternion.Slerp(transform.rotation, targetRot,
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rotationSpeed * Time.deltaTime);
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else
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transform.rotation = targetRot;
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}
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}
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}
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