给物体添加碰撞体，使碰撞器刚好包围物体

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class SetModel : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        Vector3 postion = transform.position;
        Quaternion rotation = transform.rotation;
        Vector3 scale = transform.localScale;
        transform.position = Vector3.zero;
        transform.rotation = Quaternion.Euler(Vector3.zero);
        transform.localScale = Vector3.one;
        Collider[] colliders = transform.GetComponentsInChildren<Collider>();

        foreach (Collider child in colliders)
        {
            DestroyImmediate(child);
        }

        Vector3 center = Vector3.zero;
        Renderer[] renders = transform.GetComponentsInChildren<Renderer>();
        foreach (Renderer child in renders)
        {
            center += child.bounds.center;
        }
        center /= transform.GetComponentsInChildren<Transform>().Length;
        Bounds bounds = new Bounds(center, Vector3.zero);
        foreach (Renderer child in renders)
        {
            bounds.Encapsulate(child.bounds);
        }
        BoxCollider boxCollider = transform.gameObject.AddComponent<BoxCollider>();
        boxCollider.center = bounds.center - transform.position;
        boxCollider.size = bounds.size;

        transform.position = postion;
        transform.rotation = rotation;
        transform.localScale = scale;
    }

    void Update()
    {

    }
}

原文https://blog.csdn.net/Delesgues/article/details/87712113