合并前：
合并后：
using UnityEngine; using System.Collections; using System.Collections.Generic; public class GameController : MonoBehaviour { [SerializeField] private GameObject m_player; [Tooltip("是否合并网格贴图")] public bool is_CombineMeshes=false; void Start () { if (!is_CombineMeshes) { GameObject player = Instantiate(m_player); return; } GameObject playerClone = Instantiate(m_player); List<CombineInstance> combineInstances = new List<CombineInstance>(); Material material = null; List<Transform> bones = new List<Transform>(); List<Texture2D> textures = new List<Texture2D>(); List<Vector2[]> uvList = new List<Vector2[]>(); int uvCount = 0; SkinnedMeshRenderer[] skinnedMeshs = playerClone.GetComponentsInChildren<SkinnedMeshRenderer>(); Transform[] transforms = playerClone.GetComponentsInChildren<Transform>(); for(int num=0; num < skinnedMeshs.Length; num++) { SkinnedMeshRenderer temp = skinnedMeshs[num]; if (material == null) {//返回分配给渲染器的第一个材质 material = temp.sharedMaterial; } //合并网格 CombineInstance com = new CombineInstance(); com.mesh = temp.sharedMesh; //子网格索引 //ci.subMeshIndex = num; //合并之前网格变换的矩阵 com.transform = temp.transform.localToWorldMatrix; //变换矩阵有问题（就用这句），要保持相对位置不变，要转换为父节点的本地坐标， //ci.transform = transform.worldToLocalMatrix * temp.transform.localToWorldMatrix; combineInstances.Add(com); //取得temp相对应名称的骨骼列表 int startBoneIndex = bones.Count; foreach(Transform t in temp.bones) { foreach(Transform transform in transforms) { if(transform.name != t.name) continue; bones.Add (transform); break; } } //当合并数量过多时，上面两段for循环会产生大量的GC 可以尝试用这段代替，暂时未出现效果不对 //foreach (Transform t in temp.bones) //{ // bones.Add(t); //}
//储存网格纹理坐标 uvList.Add (temp.sharedMesh.uv); uvCount += temp.sharedMesh.uv.Length; //子网格 int endBoneIndex = bones.Count; for(int i = 1; i < temp.sharedMesh.subMeshCount; ++i) { for(int jj = startBoneIndex; jj < endBoneIndex; ++jj) { bones.Add (bones[jj]); } } //贴图记录 if(temp.material.mainTexture != null) { textures.Add (temp.GetComponent<Renderer> ().material.mainTexture as Texture2D); } temp.gameObject.SetActive(false); } //贴图合并（注意合并最大尺寸） Texture2D skinnedMeshAtlas = new Texture2D (1024 , 1024); Rect[] packingResult = skinnedMeshAtlas.PackTextures (textures.ToArray () , 0); //网格纹理坐标合并 Vector2[] atlasUVs = new Vector2[uvCount]; int j = 0; for(int i = 0; i < uvList.Count; i++) { foreach(Vector2 uv in uvList[i]) { atlasUVs[j].x = Mathf.Lerp (packingResult[i].xMin , packingResult[i].xMax , uv.x); atlasUVs[j].y = Mathf.Lerp (packingResult[i].yMin , packingResult[i].yMax , uv.y); j++; } } //蒙皮网格渲染器 SkinnedMeshRenderer r = playerClone.AddComponent<SkinnedMeshRenderer> (); r.sharedMesh = new Mesh (); //第二个参数是否合并成同一个材质 参数三为false，在CombineInstance结构变换矩阵将被忽略。 r.sharedMesh.CombineMeshes (combineInstances.ToArray () , true,false ); r.bones = bones.ToArray (); r.material = material; r.material.mainTexture = skinnedMeshAtlas; r.sharedMesh.uv = atlasUVs; } }
注意 出现:Texture atlas needs textures to have Readable flag set!错误
请查看模型贴图是否勾选：
