Unity自動生成阻擋Collider的GameObject工具

前言

場景中會有碰撞阻擋，或者觸發器，一般是美術或者策劃配置，策劃一般是直接配置collider，但爲了調試方便，需要顯示對應的mesh方便查看防止的位置是否正確，我們可以寫個工具來控制生成mesh和刪除mesh方便調試使用。

思路

一般就是幾種內置的collider，meshcollider、boxcollider、capsulecollider、spherecollider等,我們判斷出對應的collider，然後創建unity內置的一些GameObject即可，meshcollider只需要實例化collider的mesh即可。

效果

代碼

#if UNITY_EDITOR
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEditor;
using UnityEngine;

using Sirenix.Utilities.Editor;
using Sirenix.OdinInspector;
using System;

public class ColliderMeshGenerateTool : MonoBehaviour
{
    bool show = false;
    List<GameObject> mColliderObjCache = new List<GameObject>();
    List<GameObject> mGameObjects = new List<GameObject>();
    [ShowInInspector]
    public bool Show
    {
        get
        {
            return show;
        }
        set
        {
            ChangeState(value);
            show = value;
        }
    }

    void Start()
    {
        mGameObjects = GetAllSceneObjectsWithInactive();
    }

    private void ChangeState(bool isShow)
    {
        if (isShow)
        {
            foreach (var obj in mGameObjects)
            {
                if (obj.GetComponent<MeshRenderer>() == null)
                    AnalyzeCollider(obj);
            }
        }
        else
        {
            for (int i = mColliderObjCache.Count - 1; i >= 0; i--)
            {
                GameObject.DestroyImmediate(mColliderObjCache[i]);
            }
            mColliderObjCache.Clear();
        }
    }

    private void AnalyzeCollider(GameObject obj)
    {
        var collider = obj.GetComponent<Collider>();
        if (collider == null)
        {
            Debug.LogError("不存在Collider");
            return;
        }
        Type type = collider.GetType();
        GameObject tempObj = null;
        if (type == typeof(SphereCollider))
        {
            tempObj = CreatePrimitiveGameObject(obj.transform, PrimitiveType.Sphere);
            var sphereCollider = obj.GetComponent<SphereCollider>();
            tempObj.transform.localScale = sphereCollider.radius * Vector3.one * 2;
        }
        else if (type == typeof(BoxCollider))
        {
            tempObj = CreatePrimitiveGameObject(obj.transform, PrimitiveType.Cube);
            var boxCollider = obj.GetComponent<BoxCollider>();
            tempObj.transform.localScale = boxCollider.size;
        }
        else if (type == typeof(MeshCollider))
        {
            tempObj = CreateGameObject(obj.transform, "MeshGameObject");
            tempObj.AddComponent<MeshRenderer>();
            var filter = tempObj.AddComponent<MeshFilter>();
            var meshCollider = obj.GetComponent<MeshCollider>();
            filter.mesh = meshCollider.sharedMesh;
        }
        else if (type == typeof(CapsuleCollider))
        {
            tempObj = CreatePrimitiveGameObject(obj.transform, PrimitiveType.Capsule);
            var capsuleCollider = obj.GetComponent<CapsuleCollider>();
            var doubleRadius = capsuleCollider.radius * 2;
            var tempScaleY = capsuleCollider.height < capsuleCollider.radius * 2 ? capsuleCollider.radius : capsuleCollider.height / 2;
            tempObj.transform.localScale = new Vector3(doubleRadius, tempScaleY, doubleRadius);
        }
        if (tempObj != null)
            mColliderObjCache.Add(tempObj);
    }

    private GameObject CreatePrimitiveGameObject(Transform parent, PrimitiveType type = PrimitiveType.Cube)
    {
        var obj = GameObject.CreatePrimitive(type);
        obj.transform.parent = parent;
        ResetTransformData(obj);
        return obj;
    }

    private GameObject CreateGameObject(Transform parent, string name)
    {
        var obj = new GameObject(name);
        obj.transform.parent = parent;
        ResetTransformData(obj);
        return obj;
    }

    private void ResetTransformData(GameObject obj)
    {
        obj.transform.localPosition = Vector3.zero;
        obj.transform.localRotation = Quaternion.Euler(Vector3.zero);
        obj.transform.localScale = Vector3.one;
    }


    /// <summary>
    /// Select All ActiveInHierarchy GameObject in Hierarchy
    /// </summary>
    /// <returns></returns>
    private List<GameObject> GetAllSceneObjectsWithInactive()
    {
        var allTransforms = Resources.FindObjectsOfTypeAll(typeof(Transform));
        var previousSelection = Selection.objects;
        Selection.objects = allTransforms.Cast<Transform>()
            .Where(x => x != null)
            .Select(x => x.gameObject)
            .Where(x => x != null && x.activeInHierarchy)
            .Where(x => x.GetComponent<Collider>() != null)
            .Cast<UnityEngine.Object>().ToArray();
        var selectedTransforms = Selection.GetTransforms(SelectionMode.Editable | SelectionMode.ExcludePrefab);
        Selection.objects = previousSelection;
        return selectedTransforms.Select(tr => tr.gameObject).ToList();
    }
}
#endif

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