Unity網格程式設計(一)

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

//網格建立差不多分這幾步: 1,確認頂點 2,確認頂點順序 3,確認法線,uv...
public class MeshStudy : MonoBehaviour
{
public float sideLength = 2;
public float angleDegree = 100;
private static readonly int ANGLE_DEGREE_PRECISION = 1000;
private static readonly int SIDE_LENGTH_PRECISION = 1000;

private MeshFilter _meshFilter;

private TriangleMeshCreator creator = new TriangleMeshCreator();


//在編輯器中執行
[ExecuteInEditMode]
private void Awake()
{
    _meshFilter = GetComponent<MeshFilter>();

}

private void Update() {
    _meshFilter.mesh = creator.CreateMesh(sideLength,angleDegree);
}

//在沒選中的時候 畫出的網格設定為灰色
void OnDrawGizmos() {
    Gizmos.color = Color.gray;
    DrawMesh();
}

void OnDrawGizmosSelected() {
    Gizmos.color = Color.green;
    DrawMesh();
}

void DrawMesh() {
    Mesh mesh = creator.CreateMesh(sideLength,angleDegree);
    int[] tris = mesh.triangles;
    //繪製三角形  網格資訊是從本地座標獲取的 若在正確的世界位置顯示需求轉換到世界座標系
    Gizmos.DrawLine(Transform2World(mesh.vertices[0]), Transform2World(mesh.vertices[1]));
    Gizmos.DrawLine(Transform2World(mesh.vertices[1]), Transform2World(mesh.vertices[2]));
    Gizmos.DrawLine(Transform2World(mesh.vertices[2]), Transform2World(mesh.vertices[0]));
}

private Vector3 Transform2World(Vector3 src) {
    return transform.TransformPoint(src);
}

private class TriangleMeshCreator
{
    private float _sideLength;
    private float _angleDegree;

    private Mesh _cacheMesh;
   

    public Mesh CreateMesh(float sideLength, float angleDegree)
    {
        if (checkDiff(sideLength, angleDegree)) {
            Mesh newMesh = Create(sideLength,angleDegree);
            if (newMesh != null) {
                _cacheMesh = newMesh;
                this._sideLength = sideLength;
                this._angleDegree = angleDegree;
            }
        }
        return _cacheMesh;
    }
    //三角形邊長和弧長                        
    private Mesh Create(float sideLength, float angleDegree)
    {
        Mesh mesh = new Mesh();
        Vector3[] verticles = new Vector3[3];

        //圓的周長為2ΠR 所以弧長 = (n°/360)*2ΠR (簡化後: L = n°ΠR/180) 
        //從弧度轉化到角度
        float angle = Mathf.Deg2Rad * angleDegree;
        float halfAngle = angle / 2;

        float cosA = Mathf.Cos(halfAngle);
        float sinA = Mathf.Sin(halfAngle);

        //隨便畫一個三角形
        verticles[0] = Vector3.zero;
        verticles[1] = new Vector3(cosA * sideLength, 0, sinA * sideLength);
        verticles[2] = new Vector3(cosA * sideLength, 0, -sinA * sideLength);


        //輸入網格的頂點和頂點順序
        int[] triangles = new int[3] { 0, 1, 2 };
        mesh.vertices = verticles;
        mesh.triangles = triangles;

        //設定uv頂點資訊
        Vector2[] uvs = new Vector2[verticles.Length];

        //設定如下貼圖中就避開了數字 說明uv的對角線座標分別對應 (0,0) 和 (1,1)
        uvs[0] = new Vector2(0, 0.5f);
        uvs[1] = new Vector2(0.5f, 0.5f);
        uvs[2] = new Vector2(0.6f, 0);
        //uvs[0] = new Vector2(0, 0.5f);
        //uvs[1] = Vector2.one;
        //uvs[2] = Vector2.right;



        mesh.uv = uvs;

        return mesh;


    }
    //檢測是否滿足構成條件
    private bool checkDiff(float sideLength, float angleDegree)
    {
        return (int)((sideLength - this._sideLength) * SIDE_LENGTH_PRECISION) != 0 ||
            (int)((angleDegree - this._angleDegree) * ANGLE_DEGREE_PRECISION) != 0;
    }
}

}

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