代码如下可直接调用

  MeshTool.SpawnCollider(mode);

using UnityEngine;public class MeshTool
{public static Bounds SpawnCollider(Transform target){Vector3 pMax = Vector3.zero;Vector3 pMin = Vector3.zero;Vector3 center = Vector3.zero;Vector3 oldPos = target.transform.position;Quaternion oldQua = target.transform.rotation;Vector3 oldScale = target.transform.localScale;target.transform.position = Vector3.zero;target.transform.rotation = Quaternion.identity;target.transform.localScale = Vector3.one;Bounds bounds = CalcBounds(target, ref pMax, ref pMin, ref center);BoxCollider collider = target.GetComponent<BoxCollider>();if (collider == null){collider = target.gameObject.AddComponent<BoxCollider>();}collider.center = bounds.center;collider.size = bounds.size;target.transform.position = oldPos;target.transform.rotation = oldQua;target.transform.localScale = oldScale;return bounds;}private static Bounds CalcBounds(Transform obj, ref Vector3 pMax, ref Vector3 pMin, ref Vector3 center){Renderer meshRenderer = obj.GetComponent<Renderer>();if (meshRenderer != null){Bounds b = meshRenderer.bounds;pMax = b.max;pMin = b.min;center = b.center;}RecursivelyCalcBounds(obj.transform, ref pMax, ref pMin);CalculateCenter(pMax, pMin, out center, ref pMax, ref pMin);Vector3 size = new Vector3(pMax.x - pMin.x, pMax.y - pMin.y, pMax.z - pMin.z);Bounds bound = new Bounds(center, size);return bound;}private static void CalculateCenter(Vector3 max, Vector3 min, out Vector3 center, ref Vector3 pMax, ref Vector3 pMin){float xc = (pMax.x + pMin.x) / 2f;float yc = (pMax.y + pMin.y) / 2f;float zc = (pMax.z + pMin.z) / 2f;center = new Vector3(xc, yc, zc);}private static void RecursivelyCalcBounds(Transform obj, ref Vector3 pMax, ref Vector3 pMin){if (obj.transform.childCount <= 0){return;}foreach (Transform item in obj){Renderer m = item.GetComponent<Renderer>();if (m != null){Bounds b = m.bounds;if (pMax.Equals(Vector3.zero) && pMin.Equals(Vector3.zero)){pMax = b.max;pMin = b.min;}if (b.max.x > pMax.x){pMax.x = b.max.x;}if (b.max.y > pMax.y){pMax.y = b.max.y;}if (b.max.z > pMax.z){pMax.z = b.max.z;}if (b.min.x < pMin.x){pMin.x = b.min.x;}if (b.min.y < pMin.y){pMin.y = b.min.y;}if (b.min.z < pMin.z){pMin.z = b.min.z;}}RecursivelyCalcBounds(item, ref pMax, ref pMin);}}}