Unity3D让BoxCollider根据子物体生成自适应大小

系列文章目录

unity工具

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👉前言

大家好，我是心疼你的一切，不定时更新Unity开发技巧，觉得有用记得一键三连哦。
有时候我们需要用到不规则的物体,或者一大堆物体,又不想每一个物体都加上碰撞盒,所以这时候就需要把这些物体放在空物体里面,在空物体上添加根据子物体的网格生成自适应大小的碰撞盒
以下就是有编辑操作的,也可以代码生成之后操作的,具体使用看自己心情哦

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提示：以下是本篇文章正文内容，下面案例可供参考

👉一、编辑器添加

1.一个空物体下面有若干个子物体,想要为空物体添加碰撞盒且碰撞盒还得要包裹所有子物体,手动拖动的话有点费时,费力,费眼,这时候有个工具是最好用的(如下图所示)

2.选中空物体点击(如下图所示)

3.点完之后的图(如下图所示)

点完之后就能看到一个全包围模型的碰撞盒,实现完成
实现如上效果需要一个编辑器脚本,脚本放在Editor文件夹下面
编辑器脚本如下

using UnityEngine;
using UnityEditor;
/// <summary>
/// 选择一个物体给当前物体添加自适应碰撞盒 编辑器脚本
/// </summary>
public class BoundsTool
{[MenuItem("Tools/添加自适应碰撞盒")]private static void AutoBoxCollider(){//如果未选中任何物体 返回GameObject gameObject = Selection.activeGameObject;if (gameObject == null) return;//计算中心点Vector3 center = Vector3.zero;var renders = gameObject.GetComponentsInChildren<Renderer>();for (int i = 0; i < renders.Length; i++){center += renders[i].bounds.center;}center /= renders.Length;//创建边界盒Bounds bounds = new Bounds(center, Vector3.zero);foreach (var render in renders){bounds.Encapsulate(render.bounds);}//先判断当前是否有碰撞器 进行销毁var currentCollider = gameObject.GetComponent<Collider>();if (currentCollider != null) Object.DestroyImmediate(currentCollider);//添加BoxCollider 设置中心点及大小var boxCollider = gameObject.AddComponent<BoxCollider>();boxCollider.center = bounds.center - gameObject.transform.position;boxCollider.size = bounds.size;}
}

👉二、代码动态添加的方法(第一种)

1.动态生成物体的时候,也是可以添加的
代码动态添加的第一种方法

/// <summary>/// 自动调节碰撞盒的大小/// </summary>/// <param name="obj_"></param>public void AutoBoxCollider(GameObject obj_){//如果未选中任何物体 返回GameObject gameObject = obj_;if (gameObject == null) return;//计算中心点Vector3 center = Vector3.zero;var renders = gameObject.GetComponentsInChildren<Renderer>();for (int i = 0; i < renders.Length; i++){center += renders[i].bounds.center;}center /= renders.Length;//创建边界盒Bounds bounds = new Bounds(center, Vector3.zero);foreach (var render in renders){bounds.Encapsulate(render.bounds);}//先判断当前是否有碰撞器 进行销毁var currentCollider = gameObject.GetComponent<Collider>();if (currentCollider != null) UnityEngine.Object.DestroyImmediate(currentCollider);//添加BoxCollider 设置中心点及大小var boxCollider = gameObject.AddComponent<BoxCollider>();if (!gameObject.GetComponent<Highlighter>()){gameObject.AddComponent<Highlighter>();          }    boxCollider.center = bounds.center - gameObject.transform.position;boxCollider.size = bounds.size;}

结果就自行测试吧,我就不贴图片了

👉三、代码动态添加的方法(第二种)

调用方法如下

MeshTool.SpawnCollider(parents); //传一个父物体即可

代码如下

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);}}}

👉四、重新设置模型的中心点

有时候模型的轴向不准确,就需要重新设置模型的轴向了,
有时候有多个子物体的时候,想要把轴向设置到模型的中心点,这个时候就可以用了,反正只要能代码添加的,绝对不会手动添加的
能懒就懒,能不动就不动,哈哈哈…

代码方法如下

List<GameObject> ObjZ = new List<GameObject>();Vector3 posZ = Vector3.zero;/// <summary>/// 设置模型的中心点,方便做模型的移动/// </summary>/// <param name="_trans"></param>public void SetModelPos(Transform _trans){yield return new WaitForSeconds(0.2f);posZ = Vector3.zero;ObjZ.Clear();for (int i = 0; i < _trans.childCount; i++){posZ += (_trans.GetChild(i).GetComponent<MeshCollider>().bounds.center);ObjZ.Add(_trans.GetChild(i).gameObject);}posZ /= _trans.childCount;for (int i = 0; i < ObjZ.Count; i++){ObjZ[i].transform.parent = null;}_trans.position = posZ;for (int i = 0; i < ObjZ.Count; i++){ObjZ[i].transform.parent = _trans;}     }

如果有需要会继续添加好用的小工具哦,谢谢

👉壁纸分享

👉总结

以上就是讲了如何设置碰撞盒的自适应大小，如能帮助到你，就帮忙点个三连吧，谢谢
不定时更新Unity开发技巧，觉得有用记得一键三连哦。么么哒