初识Unity3D的UV贴图

下面直接上代码

using System.Collections.Generic; using UnityEngine; public class Uvtest2 : MonoBehaviour { 
    public static List<Vector3> Vertices;//顶点 public static List<int> Triangles;//三角形索引 public static List<Vector2> Uvs;//uv信息 public static float VerticesCount;//顶点个数 public static float TrianglesCount;//三角形索引个数 public static float UVsCount;//uv个数 public static Vector3 Scales;//scale值 void Start() { 
    SetUVStart(gameObject); } void Update() { 
    if (Scales != gameObject.transform.localScale) { 
    SetUV(this.gameObject); Scales = gameObject.transform.localScale; } } public void SetUVStart(GameObject gameObject)//得到控制uv需要的一些初始值 { 
    Mesh mh = gameObject.GetComponent<MeshFilter>().mesh; Vertices = new List<Vector3>(); Triangles = new List<int>(); Uvs = new List<Vector2>(); VerticesCount = mh.vertices.Length; UVsCount = mh.uv.Length; TrianglesCount = mh.triangles.Length; for (int i = 0; i < VerticesCount; i++) { 
    Vertices.Add(mh.vertices[i]); } for (int i = 0; i < TrianglesCount; i++) { 
    Triangles.Add(mh.triangles[i]); } for (int i = 0; i < UVsCount; i++) { 
    Uvs.Add(mh.uv[i]); } Scales = gameObject.transform.localScale; } public void SetUV(GameObject gameObject)//设置UV { 
    Mesh mh = gameObject.GetComponent<MeshFilter>().mesh; Vector3 scale = gameObject.transform.localScale; List<Vector2> uvs = new List<Vector2>(mh.uv.Length); for (int i = 0; i < Uvs.Count; i++) { 
    uvs.Add(Uvs[i]); } int number = 0; for (int i = 0; i < Triangles.Count; i += 3) { 
    int index1 = Triangles[i]; int index2 = Triangles[i + 1]; int index3 = Triangles[i + 2]; //通过三角形的顶点值判断uv的x、y轴对应的是scale的哪个轴，因为scale是3维二uv是2维 if (Vertices[index2].y - Vertices[index1].y != 0) { 
    uvs[index1] = new Vector2(Uvs[index1].x, Uvs[index1].y); uvs[index2] = new Vector2(Uvs[index2].x, Uvs[index2].y * scale.y); //判断一个面相应三角形需要变化的uv，一个面由两个三角构成 if (number == 0) { 
    if (Vertices[index3].x - Vertices[index1].x != 0) { 
    uvs[index2] = new Vector2(Uvs[index2].x, Uvs[index2].y * scale.y); uvs[index3] = new Vector2(Uvs[index3].x * scale.x, Uvs[index3].y * scale.y); } else if (Vertices[index3].z - Vertices[index1].z != 0) { 
    uvs[index2] = new Vector2(Uvs[index2].x, Uvs[index2].y * scale.y); uvs[index3] = new Vector2(Uvs[index3].x * scale.z, Uvs[index3].y * scale.y); } number++; } else { 
    if (Vertices[index3].x - Vertices[index1].x != 0) { 
    uvs[index2] = new Vector2(Uvs[index2].x * scale.x, Uvs[index2].y * scale.y); uvs[index3] = new Vector2(Uvs[index3].x * scale.x, Uvs[index3].y); } else if (Vertices[index3].z - Vertices[index1].z != 0) { 
    uvs[index2] = new Vector2(Uvs[index2].x * scale.z, Uvs[index2].y * scale.y); uvs[index3] = new Vector2(Uvs[index3].x * scale.z, Uvs[index3].y); } number = 0; } } else if (Vertices[index2].z - Vertices[index1].z != 0) { 
    uvs[index1] = new Vector2(Uvs[index1].x, Uvs[index1].y); uvs[index2] = new Vector2(Uvs[index2].x, Uvs[index2].y * scale.z); if (number == 0) { 
    if (Vertices[index3].x - Vertices[index1].x != 0) { 
    uvs[index2] = new Vector2(Uvs[index2].x, Uvs[index2].y * scale.z); uvs[index3] = new Vector2(Uvs[index3].x * scale.x, Uvs[index3].y * scale.z); } else if (Vertices[index3].y - Vertices[index1].y != 0) { 
    uvs[index2] = new Vector2(Uvs[index2].x, Uvs[index2].y * scale.z); uvs[index3] = new Vector2(Uvs[index3].x * scale.y, Uvs[index3].y * scale.z); } number++; } else { 
    if (Vertices[index3].x - Vertices[index1].x != 0) { 
    uvs[index2] = new Vector2(Uvs[index2].x * scale.x, Uvs[index2].y * scale.z); uvs[index3] = new Vector2(Uvs[index3].x * scale.x, Uvs[index3].y); } else if (Vertices[index3].y - Vertices[index1].y != 0) { 
    uvs[index2] = new Vector2(Uvs[index2].x * scale.y, Uvs[index2].y * scale.z); uvs[index3] = new Vector2(Uvs[index3].x * scale.y, Uvs[index3].y); } number = 0; } } } mh.uv = uvs.ToArray();//赋值UV } } 

该代码还相对比较简陋，只能用于立方体的uv控制，复杂的uv还需要慢慢摸索，大家有什么好的方法也可以分享一下。