在unity3d中分别修改Cube每个面的贴图UV

　　　　关于UV贴图的文章我们在前面已经介绍过《如何实现Unity3d手动UV动画 》，本篇文章我们来看下修改一个Cube中每个面的贴图UV，也就是贴图中有多个矩形贴图，需要程序从贴图中读取一部分赋值给Cube每个面。
　　看下最终效果图
　　废话不多说，贴上代码
　　using Unity Engine;
　　using System.Collections;
　　[ExecuteInEditMode]
　　public class CustomUVS : MonoBehaviour {
　　public Vector2 topPoint;
　　public Vector2 bottomPoint;
　　public Vector2 leftPoint;
　　public Vector2 rightPoint;
　　public Vector2 frontPoint;
　　public Vector2 backPoint;
　　private Mesh m_mesh;
　　public enum CubeFaceType
　　{
　　Top,
　　Bottom,
　　Left,
　　Right,
　　Front,
　　Back
　　};
　　// Use this for initialization
　　void Start () {
　　MeshFilter meshFilter = GetComponent();
　　if (meshFilter == null) {
　　Debug.LogError("Script needs MeshFilter component");
　　return;
　　}
　　#if UNITY_EDITOR
　　Mesh meshCopy = Mesh.Instantiate(meshFilter.sharedMesh) as Mesh; // Make a deep copy
　　meshCopy.name = "Cube";
　　m_mesh = meshFilter.mesh = meshCopy; // Assign the copy to the meshes
　　#else
　　m_mesh = meshFilter.mesh;
　　#endif
　　if (m_mesh == null || m_mesh.uv.Length != 24) {
　　Debug.LogError("Script needs to be attached to built-in cube");
　　return;
　　}
　　UpdateMeshUVS();
　　}
　　// Update is called once per frame
　　void Update ()
　　{
　　#if UNITY_EDITOR
　　UpdateMeshUVS();
　　#endif
　　}
　　void UpdateMeshUVS()
　　{
　　Vector2[] uvs = m_mesh.uv;
　　// Front
　　SetFaceTexture(CubeFaceType.Front, uvs);
　　// Top
　　SetFaceTexture(CubeFaceType.Top, uvs);
　　// Back
　　SetFaceTexture(CubeFaceType.Back, uvs);
　　// Bottom
　　SetFaceTexture(CubeFaceType.Bottom, uvs);
　　// Left
　　SetFaceTexture(CubeFaceType.Left, uvs);
　　// Right
　　SetFaceTexture(CubeFaceType.Right, uvs);
　　m_mesh.uv = uvs;
　　}
　　Vector2[] GetUVS(float originX, float originY)
　　{
　　Vector2[] uvs = new Vector2[4];
　　uvs[0] = new Vector2(originX / 3.0f, originY / 3.0f);
　　uvs[1] = new Vector2((originX + 1) / 3.0f, originY / 3.0f);
　　uvs[2] = new Vector2(originX / 3.0f, (originY + 1) / 3.0f);
　　uvs[3] = new Vector2((originX + 1) / 3.0f, (originY + 1) / 3.0f);
　　return uvs;
　　}
　　void SetFaceTexture(CubeFaceType faceType, Vector2[] uvs)
　　{
　　if (faceType == CubeFaceType.Front) {
　　Vector2[] newUVS = GetUVS(frontPoint.x, frontPoint.y);
　　uvs[0] = newUVS[0];
　　uvs[1] = newUVS[1];
　　uvs[2] = newUVS[2];
　　uvs[3] = newUVS[3];
　　}else if (faceType == CubeFaceType.Back) {
　　Vector2[] newUVS = GetUVS(backPoint.x, backPoint.y);
　　uvs[10] = newUVS[0];
　　uvs[11] = newUVS[1];
　　uvs[6] = newUVS[2];
　　uvs[7] = newUVS[3];
　　}else if (faceType == CubeFaceType.Top) {
　　Vector2[] newUVS = GetUVS(topPoint.x, topPoint.y);
　　uvs[8] = newUVS[0];
　　uvs[9] = newUVS[1];
　　uvs[4] = newUVS[2];
　　uvs[5] = newUVS[3];
　　}else if (faceType == CubeFaceType.Bottom) {
　　Vector2[] newUVS = GetUVS(bottomPoint.x, bottomPoint.y);
　　uvs[12] = newUVS[0];
　　uvs[14] = newUVS[1];
　　uvs[15] = newUVS[2];
　　uvs[13] = newUVS[3];
　　}else if (faceType == CubeFaceType.Left) {
　　Vector2[] newUVS = GetUVS(leftPoint.x, leftPoint.y);
　　uvs[16] = newUVS[0];
　　uvs[18] = newUVS[1];
　　uvs[19] = newUVS[2];
　　uvs[17] = newUVS[3];
　　}else if (faceType == CubeFaceType.Right) {
　　Vector2[] newUVS = GetUVS(rightPoint.x, rightPoint.y);
　　uvs[20] = newUVS[0];
　　uvs[22] = newUVS[1];
　　uvs[23] = newUVS[2];
　　uvs[21] = newUVS[3];
　　}
　　}
　　}
　　使用的贴图
　　给一个Cube添加改图片材质。并添加CustomUVS.cs脚本。修改需要截取的区域原点
　　注意：由于图片是3×3的，所以截取区域中按3等分截取。
　　好了，本篇unity3d教程到此结束，下篇我们再会!
　　资源地址: http://cg.silucg.com/dongman/unity3d/7996.html

{:7_255:}

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