unity对模型实现剖切的代码

在Unity中，剖切模型（ LOD, Level of Detail）通常用于优化场景性能，当玩家靠近时显示高精度模型，远离时显示简化版本。这里是一个简单的示例，展示如何在C#脚本中为游戏对象添加LOD切换：

using UnityEngine;

public class LODManager : MonoBehaviour
{
    public GameObject highDetailModel; // 高精度模型
    public GameObject lowDetailModel; // 简化模型

    private MeshFilter highDetailMeshFilter;
    private MeshFilter lowDetailMeshFilter;

    void Start()
    {
        highDetailMeshFilter = highDetailModel.GetComponent<MeshFilter>();
        lowDetailMeshFilter = lowDetailModel.GetComponent<MeshFilter>();

        UpdateLOD();
    }

    void UpdateLOD()
    {
        float distanceToCamera = Vector3.Distance(transform.position, Camera.main.transform.position);
        
        if (distanceToCamera > lodDistanceThreshold) // 设定距离阈值
        {
            GetComponent<MeshRenderer>().sharedMaterial = lowDetailMeshFilter.mesh.sharedMaterial;
            meshFilter = lowDetailMeshFilter;
        }
        else
        {
            GetComponent<MeshRenderer>().sharedMaterial = highDetailMeshFilter.mesh.sharedMaterial;
            meshFilter = highDetailMeshFilter;
        }
    }
}

在这个例子中，`UpdateLOD`函数会在每一帧检查相机到物体的距离，并根据预设的阈值切换相应的Mesh滤镜。当物体离摄像机足够远时，它会显示低细节模型；反之则显示高细节模型。