绘制圆形/圆环/扇形/扇面Mesh

using UnityEngine;
using System.Collections;[RequireComponent(typeof(MeshRenderer), typeof(MeshFilter))]
public class TestCircle : MonoBehaviour {public float Radius = 5;  //半径public int Segments = 50;  //分割数public float InnerRadius = 3; //内圆半径public float AngleDegree = 90;private CircleMeshCreator _creator = new CircleMeshCreator();private MeshFilter _meshFilter;void Awake(){_meshFilter = GetComponent<MeshFilter>();}void Update(){_meshFilter.mesh = _creator.CreateMesh(Radius, Segments, InnerRadius, AngleDegree);}void OnDrawGizmos(){Gizmos.color = Color.gray;DrawMesh();}void OnDrawGizmosSelected(){Gizmos.color = Color.green;DrawMesh();}private void DrawMesh(){Mesh mesh = _creator.CreateMesh(Radius, Segments, InnerRadius, AngleDegree);int[] tris = mesh.triangles;for (int i = 0; i < tris.Length; i+=3){Gizmos.DrawLine(TransformToWorld(mesh.vertices[tris[i]]), TransformToWorld(mesh.vertices[tris[i + 1]]));Gizmos.DrawLine(TransformToWorld(mesh.vertices[tris[i]]), TransformToWorld(mesh.vertices[tris[i + 2]]));Gizmos.DrawLine(TransformToWorld(mesh.vertices[tris[i+1]]), TransformToWorld(mesh.vertices[tris[i + 2]]));}}private Vector3 TransformToWorld(Vector3 src){return transform.TransformPoint(src);}private class CircleMeshCreator{private static readonly int PRECISION = 1000;private float _radius;private int _segments;private float _innerRadius;private float _angleDegree;private Mesh _cacheMesh ;public Mesh CreateMesh(float radius, int segments, float innerRadius, float angleDegree){if (checkDiff(radius, segments, innerRadius, angleDegree)){Mesh newMesh = Create(radius, segments, innerRadius, angleDegree);if (newMesh != null){_cacheMesh = newMesh;this._radius = radius;this._segments = segments;this._innerRadius = innerRadius;this._angleDegree = angleDegree;}}return _cacheMesh;}private Mesh Create(float radius, int segments, float innerRadius, float angleDegree){if (segments <= 0){segments = 1;#if UNITY_EDITORDebug.Log("segments must be larger than zero.");#endif}Mesh mesh = new Mesh();int vlen = segments * 2 + 2;Vector3[] vertices = new Vector3[vlen];float angle = Mathf.Deg2Rad * angleDegree;float currAngle = angle / 2;float deltaAngle = angle / segments;for (int i = 0; i < vlen; i+=2){float cosA = Mathf.Cos(currAngle);float sinA = Mathf.Sin(currAngle);vertices[i] = new Vector3 (cosA * innerRadius, 0, sinA * innerRadius);vertices[i + 1] = new Vector3 (cosA * radius, 0, sinA * radius);currAngle -= deltaAngle;}int tlen = segments * 6;int[] triangles = new int[tlen];for (int i = 0, vi = 0; i < tlen; i += 6, vi+=2){triangles[i] = vi;triangles[i + 1] = vi + 1;triangles[i + 2] = vi + 3;triangles[i + 3] = vi + 3;triangles[i + 4] = vi + 2;triangles[i + 5] = vi;}Vector2[] uvs = new Vector2[vlen];for (int i = 0; i < vlen; i++){uvs [i] = new Vector2 (vertices[i].x / radius / 2 + 0.5f, vertices[i].z / radius / 2 + 0.5f);}mesh.vertices = vertices;mesh.triangles = triangles;mesh.uv = uvs;return mesh;}private bool checkDiff(float radius, int segments, float innerRadius, float angleDegree){return segments != this._segments || (int)((angleDegree - this._angleDegree) * PRECISION) != 0 ||(int)((radius - this._radius) * PRECISION) != 0 || (int)((innerRadius - this._innerRadius) * PRECISION) != 0;}}}

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