232 lines
9.4 KiB
C#
232 lines
9.4 KiB
C#
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using System.Collections.Generic;
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using Module.Log;
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using UnityEngine;
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using UnityEditor;
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/// <summary>
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/// 用于将分散成多块的大模型，分解成小模型以减少顶点运算量
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/// </summary>
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public static class LargeMeshSplit
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{
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public const float splitDistanceSqr = 1f * 1f;
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[MenuItem("GameObject/Split Mesh", false, 16)]
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public static void SplitMeshAndGameObject()
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{
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var gameObjects = Selection.gameObjects;
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if (gameObjects.Length <= 0)
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LogModule.ErrorLog("未选取GameObject！");
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else
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{
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var targetList = new List<GameObject>();
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for (var i = 0; i < gameObjects.Length; i++)
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{
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var list = EditorCommonUtility.GetGameObjects(gameObjects[i].transform);
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for (var j = 0; j < list.Count; j++)
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if (!targetList.Contains(list[j]))
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targetList.Add(list[j]);
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}
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for (var i = 0; i < targetList.Count; i++)
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{
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var meshFilter = targetList[i].GetComponent<MeshFilter>();
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if (meshFilter != null)
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SplitForOneMeshRenderer(meshFilter);
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}
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}
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}
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public static void SplitForOneMeshRenderer(MeshFilter oldFilter)
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{
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var oldMesh = oldFilter.sharedMesh;
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if (oldMesh.subMeshCount > 1)
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LogModule.WarningLog(string.Format("{0}模型具有一个以上的SubMesh", oldFilter.gameObject.name));
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else
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{
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var oldVerticles = oldMesh.vertices;
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var triangleList = new List<TriangleRecord>();
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var trianglePoints = oldMesh.triangles;
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for (var i = 0; i < trianglePoints.Length; i += 3)
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{
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var point0 = new PointRecord(trianglePoints[i], oldVerticles[trianglePoints[i]]);
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var point1 = new PointRecord(trianglePoints[i + 1], oldVerticles[trianglePoints[i + 1]]);
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var point2 = new PointRecord(trianglePoints[i + 2], oldVerticles[trianglePoints[i + 2]]);
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var triangle = new TriangleRecord(point0, point1, point2);
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triangleList.Add(triangle);
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}
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var meshList = new List<MeshPointBlock>();
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var outerId = 0;
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while (outerId < triangleList.Count)
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{
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// 添加每个区域的第一个三角形
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var pointBlock = new MeshPointBlock();
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meshList.Add(pointBlock);
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pointBlock.triangleList.Add(triangleList[outerId]);
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outerId++;
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var innerId = outerId;
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// 扫描同第一个三角形连接的全部三角形
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while (innerId < triangleList.Count)
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{
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var innerTriangle = triangleList[innerId];
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// 如果连接成功，则将面板提升到outerId位置，然后innerId从outerId下一个位置开始扫描
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if (pointBlock.IsTriangleLinked(innerTriangle))
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{
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var temp = innerTriangle;
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triangleList[innerId] = triangleList[outerId];
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triangleList[outerId] = temp;
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innerId = outerId;
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outerId++;
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pointBlock.triangleList.Add(innerTriangle);
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}
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innerId++;
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}
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}
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if (meshList.Count < 2)
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LogModule.DebugLog(string.Format("无需处理GameObject {0}", oldFilter.gameObject.name));
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else
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{
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LogModule.WarningLog(string.Format("分解模型物体{0}为{1}份", oldFilter.gameObject.name, meshList.Count));
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var oldUv = oldMesh.uv;
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var oldNormals = oldMesh.normals;
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var oldTangeant = oldMesh.tangents;
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var oldRenderer = oldFilter.GetComponent<MeshRenderer>();
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for (var i = 0; i < meshList.Count; i++)
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{
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var pointBlock = meshList[i];
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var pointReflections = pointBlock.GetPointReflections();
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var mesh = new Mesh();
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var verticles = new Vector3[pointReflections.Count];
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var uv = new Vector2[pointReflections.Count];
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var normals = new Vector3[pointReflections.Count];
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// 注：模型可能没有Tangeant参数，因此特别处理
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var tangeants = new Vector4[oldTangeant.Length > 0 ? pointReflections.Count : 0];
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var triangles = new int[pointBlock.triangleList.Count * 3];
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for (var j = 0; j < verticles.Length; j++)
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{
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var index = pointReflections[j];
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verticles[j] = oldVerticles[index];
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uv[j] = oldUv[index];
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normals[j] = oldNormals[index];
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if (tangeants.Length > 0)
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tangeants[j] = oldTangeant[index];
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}
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for (var j = 0; j < pointBlock.triangleList.Count; j++)
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{
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var triangle = pointBlock.triangleList[j];
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var index = j * 3;
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triangles[index] = pointReflections.IndexOf(triangle.points[0].index);
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triangles[index + 1] = pointReflections.IndexOf(triangle.points[1].index);
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triangles[index + 2] = pointReflections.IndexOf(triangle.points[2].index);
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}
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mesh.vertices = verticles;
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mesh.uv = uv;
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mesh.normals = normals;
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mesh.tangents = tangeants;
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mesh.triangles = triangles;
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var clone = new GameObject(oldFilter.gameObject.name + string.Format("_{0}", i));
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var meshFilter = clone.AddComponent<MeshFilter>();
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meshFilter.mesh = mesh;
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var meshRenderer = clone.AddComponent<MeshRenderer>();
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meshRenderer.sharedMaterials = oldRenderer.sharedMaterials;
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//meshRenderer.sharedMaterials = new Material[oldRenderer.sharedMaterials.Length];
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//for (var j = 0; j < oldRenderer.sharedMaterials.Length; j++)
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// meshRenderer.sharedMaterials[j] = oldRenderer.sharedMaterials[j];
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meshRenderer.shadowCastingMode = oldRenderer.shadowCastingMode;
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meshRenderer.receiveShadows = oldRenderer.receiveShadows;
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clone.transform.SetParent(oldFilter.transform.parent, false);
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clone.transform.localPosition = oldFilter.transform.localPosition;
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clone.transform.localRotation = oldFilter.transform.localRotation;
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clone.transform.localScale = oldFilter.transform.localScale;
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}
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oldFilter.gameObject.SetActive(false);
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}
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}
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}
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public class MeshPointBlock
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{
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public List<TriangleRecord> triangleList;
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public MeshPointBlock()
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{
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triangleList = new List<TriangleRecord>();
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}
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public bool IsTriangleLinked(TriangleRecord other)
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{
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var result = false;
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for (var i = 0; i < triangleList.Count; i++)
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{
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if (triangleList[i].IsTriangleLinked(other))
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{
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result = true;
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break;
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}
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}
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return result;
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}
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public List<int> GetPointReflections()
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{
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// 映射新的顶点列表index到旧的顶点列表中
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var pointList = new List<int>();
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for (var i = 0; i < triangleList.Count; i++)
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{
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var triangle = triangleList[i];
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for (var j = 0; j < triangle.points.Length; j++)
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{
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if (pointList.IndexOf(triangle.points[j].index) < 0)
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pointList.Add(triangle.points[j].index);
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}
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}
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return pointList;
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}
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}
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public class TriangleRecord
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{
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public readonly PointRecord[] points;
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public TriangleRecord(PointRecord point0, PointRecord point1, PointRecord point2)
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{
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points = new PointRecord[3];
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points[0] = point0;
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points[1] = point1;
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points[2] = point2;
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}
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public bool IsTriangleLinked(TriangleRecord other)
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{
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var result = false;
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for (var i = 0; i < points.Length; i++)
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{
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for (var j = 0; j < other.points.Length; j++)
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{
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if (points[i].index == other.points[j].index ||
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(points[i].position - other.points[j].position).sqrMagnitude < splitDistanceSqr)
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{
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result = true;
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break;
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}
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}
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if (result)
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break;
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}
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return result;
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}
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}
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public struct PointRecord
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{
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public readonly int index;
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public readonly Vector3 position;
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public PointRecord(int index, Vector3 position)
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{
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this.index = index;
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this.position = position;
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}
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}
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}
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