Unity换装系统(2)

using UnityEngine;using System.Collections;using System.Collections.Generic;public class CombineMesh : MonoBehaviour{    void OnGUI()    {        if (GUI.Button(new Rect(0, 0, 200, 30), "CombineMeshes"))        {            CombineMeshes();        }    }    public void CombineMeshes()    {        SkinnedMeshRenderer[] smr = gameObject.GetComponentsInChildren<SkinnedMeshRenderer>();        List<CombineInstance> combineInstances = new List<CombineInstance>();        List<Material> materials = new List<Material>();        List<Transform> bones = new List<Transform>();        for (int i = 0; i < smr.Length; i++)        {            materials.AddRange(smr[i].materials);            bones.AddRange(smr[i].bones);            // 收集待合并的对象信息            for (int k = 0; k < smr[i].sharedMesh.subMeshCount; k++)            {                CombineInstance ci = new CombineInstance();                ci.mesh = smr[i].sharedMesh;                ci.subMeshIndex = k;                combineInstances.Add(ci);            }            // 删除原有模型的对象(如果有还原外观的需求，也可以暂时将对象的活动状态设置为false，代码如下)            // smr[i].gameObject.SetActive(false);            Destroy(smr[i].gameObject);        }        // 创建新的SkinnedMeshRenderer，合并后的mesh数据都在该对象下        SkinnedMeshRenderer combinedSMR = gameObject.GetComponent<SkinnedMeshRenderer>();        if (combinedSMR == null)        {            combinedSMR = gameObject.AddComponent<SkinnedMeshRenderer>();        }        combinedSMR.sharedMesh = new Mesh();        combinedSMR.bones = bones.ToArray();        combinedSMR.materials = materials.ToArray();        combinedSMR.rootBone = gameObject.transform;        // 由于合并mesh的material数据不统一，因此第二项参数不能设置为true        combinedSMR.sharedMesh.CombineMeshes(combineInstances.ToArray(), false, false);    }}运行结果：可以看到合并后人物的各个部件都合并到新创建的skinnenMeshRenderer下了，Unity Editor中Statistics中visible skinned meshes的数量也由9个变成了1个。总结分析性能方面会由于skinned mesh renderer的减少而减轻cpu的负担，而在代码中然而在导入模型资源时，需要将read/write enabled打钩。而该选项会增加内存的占用，mesh为了可以在代码中进行修改，需要保留一份拷贝而驻留内存。官方的说明如下：Read/Write EnabledIf enabled, Mesh data is kept in memory so that a custom script can read and change it. Disabling this option saves memory, because Unity can unload a copy of Mesh data in the game. However, in certain cases when the Mesh is used with a Mesh Collider, this option must be enabled.