绘制三角形

Posted 2022-01-29 DaLiangChen

网格绘制重要属性

• vertices（Vector3[]）：存储绘制网格的顶点位置信息。
• triangles（int[]）：通过设置对vertices的索引来定义三角形数组。
• uv（Vector2[]）：贴图坐标系，记录了贴图在模型上的对应坐标点。

绘制三角形

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

namespace Mx.MeshDraw

    public class BaseMeshDraw : MonoBehaviour
    
        protected MeshFilter meshFilter;
        protected MeshRenderer meshRenderer;
        protected Mesh mesh;

        protected int[] tris;
        protected Vector2[] uvs;
        protected Vector3[] normals;

        private void Awake()
        
            meshFilter = GetComponent<MeshFilter>();
            if (meshFilter == null) meshFilter = gameObject.AddComponent<MeshFilter>();

            meshRenderer = GetComponent<MeshRenderer>();
            if (meshRenderer == null) meshRenderer = gameObject.AddComponent<MeshRenderer>();
        
    

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Mx.MeshDraw;

namespace Mx.Example


    /// <summary>绘制三角形</summary>
    public class Example01 : BaseMeshDraw
    
       
        private void Start()
        
            drawTriangle();
        

        /// <summary>绘制三角形</summary>
        private void drawTriangle()
        
            mesh = new Mesh();

            Vector3[] verticesArr = new Vector3[3];
            verticesArr[0] = new Vector3(0, 0, 0);
            verticesArr[1] = new Vector3(0, 1, 0);
            verticesArr[2] = new Vector3(1, 0, 0);

            mesh.vertices = verticesArr;

            tris = new int[3];
            tris[0] = 0;
            tris[1] = 1;
            tris[2] = 2;

            mesh.triangles = tris;

            mesh.RecalculateBounds();
            mesh.RecalculateNormals();
            mesh.RecalculateTangents();

            meshFilter.mesh = mesh;