[Unity实战]自定义mesh

参考链接：

对于自定义mesh，有三点很重要：

1.顶点个数=三角形数+2；三角形顶点数=3*三角形数

2.顶点创建的顺序最好是顺时针或者逆时针创建的，，这样可以大大地减少算法的复杂度

3.顶点绘制的顺序必须是顺时针或者逆时针绘制的，这样才能正确地绘制以顶点为边界点的图形，顶点绘制的顺序参考mesh.triangles

using UnityEngine;using System.Collections;[RequireComponent(typeof(MeshFilter))][RequireComponent(typeof(MeshRenderer))]public class CustomMesh : MonoBehaviour {}using UnityEngine;using System.Collections;using System.Collections.Generic;using UnityEditor;//使用前最好先锁定Inspector面板！[CustomEditor(typeof(CustomMesh))] public class CustomMeshEditor : Editor {private List<Vector3> vertices = new List<Vector3>();private int[] triangles;void OnSceneGUI(){CustomMesh customMesh = (CustomMesh)target;for (int i = 0; i < vertices.Count; i++){Handles.PositionHandle(vertices[i], Quaternion.identity);Handles.Label(vertices[i], i.ToString());}if (vertices.Count > 1){Handles.DrawPolyLine(vertices.ToArray());Handles.DrawLine(vertices[vertices.Count – 1], vertices[0]);}//在OnSceneGUI()中只能通过Handles来绘制新视图//如果你想引入GUI的元素哪么就需要使用BeginGUI()和EndGUI()组合的使用。Handles.BeginGUI();GUILayout.BeginArea(new Rect(0, 0, 100, 100));if (GUILayout.Button("创建点")){vertices.Add(customMesh.transform.position);}if (GUILayout.Button("撤销点")){vertices.RemoveAt(vertices.Count – 1);}if (GUILayout.Button("导出mesh")){Mesh mesh = new Mesh();int triangleAmount = vertices.Count – 2;triangles = new int[3 * triangleAmount];//根据三角形的个数，来计算绘制三角形的顶点顺序（索引）//顺序必须为顺时针或者逆时针for (int i = 0; i < triangleAmount; i++){triangles[3 * i] = 0;//固定第一个点triangles[3 * i + 1] = i + 1;triangles[3 * i + 2] = i + 2;}mesh.vertices = vertices.ToArray();mesh.triangles = triangles;AssetDatabase.CreateAsset(mesh, "Assets/CustomMesh.asset");}GUILayout.EndArea();Handles.EndGUI();}}

世上再美的风景，都不及回家的那段路。