unity3D中 material中tiling和offset属性解释

贴图有可能是多行多列的一些图案组成的。当我们需要一帧，一帧的播放时候。也就是帧序列动画，

我们就需要用到tiling和offset两个属性，

默认图片的左下角为坐标圆点即：（0,0）

tiling是图片的大小，offset是偏移量

来看看一些例子：

 using UnityEngine;
 using System.Collections;
 
 public class animspite : MonoBehaviour
 {
 
     public int totolFrame;//总帧数，即多少帧
     public int fbs;//帧速度 即 1秒运行多少帧
     public int rowNumber; //几行
     public int colNumber; //几列
     public bool isDes = false; //是否播放一次就销毁对象
     // Use this for initialization
     void Start()
     {
         //判断当前平台
         #if UNITY_EDITOR
                 Debug.Log("Unity Editor");
         #endif
 
         #if UNITY_IPHONE
                 Debug.Log("Iphone");
         #endif
 
         #if UNITY_STANDALONE_OSX
                 Debug.Log("Stand Alone OSX");
         #endif
 
         #if UNITY_STANDALONE_WIN
                 Debug.Log("Stand Alone Windows");
         #endif
     }
 
     // Update is called once per frame
     void Update()
     {
         int index = (int)(Time.time * fbs);
 
         index = index % totolFrame;
 
         float sizeX = 1.0f / colNumber;
         float sizeY = 1.0f / rowNumber;
         Vector2 size = new Vector2(sizeX, sizeY);
 
         float uIndex = index % colNumber;
         float vIndex = index / colNumber;
　　　　　　 //int vIndex = index % rowNumber;
 
         float offsetX = uIndex * size.x;
         float offsetY = (1.0f - size.y) - (vIndex * size.y);
         //offsetY = 1.0f * vIndex / rowNumber;
 
         Vector2 offset = new Vector2(offsetX, offsetY);
 
         transform.renderer.material.mainTextureScale = size;
         transform.renderer.material.mainTextureOffset = offset;
 
         if (isDes)
         {
             if (Time.time > )
             {
                 Destroy(this.gameObject);
             }
         }
     }
 }

  //--------------更直观的分割线----------------------
         int currentFame = (int)(Time.time * fbs); //算出当前帧
　　　　　　if (assing != 0) currentFame = assing;//当指定assing值时，即只播放指定帧的动画
         Vector2 size = new Vector2(); //算出当前帧，图片的坐标
         size.x = 1.0f / colNumber;
         size.y = 1.0f / rowNumber;
 
         //算出当前帧，图片分别在x。y轴上的坐标
         float xFrame = currentFame % colNumber;
         float yFrmae = currentFame / colNumber;
 
         Vector2 offset = new Vector2(); //算出当前帧，图片的偏移量
         offset.x = xFrame * size.x;
         offset.y = 1.0f - size.y - (yFrmae * size.y);
 
         //赋值
         transform.renderer.material.mainTextureScale = size;
         transform.renderer.material.mainTextureOffset = offset;

 /*参考自网络*/
     public int rowCount = ; //图片的中帧图片的行数
     public int colCount = ; //图片的中帧图片的列数
     public int rowStart = ; //开始播放的行下标
     public int colStart = ; //开始播放的列下标
     public int totalCells = ; //帧图片的总数
     public int fps = ;  //播放速度
     //Update
     void Update()
     {
         SetSpriteAnimation(colCount, rowCount, rowStart, colStart, totalCells, fps);
     }
 
     //SetSpriteAnimation
     void SetSpriteAnimation(int colCount, int rowCount, int rowStart, int colStart, int totalCells, int fps)
     {
         //因为Time.time的为游戏运行的时间，所以index=1,2,3,4...
         int index = (int)(Time.time * fps);
         index = index % totalCells;
         float sizeX = 1.0f / colCount;
         float sizeY = 1.0f / rowCount;
         Vector2 size = new Vector2(sizeX, sizeY);
         var uIndex = index % colCount;
         var vIndex = index / colCount;
         float offsetX = (uIndex + colStart) * size.x;
         //V轴位于图片的下方，因此V要翻转下
         float offsetY = (1.0f - size.y) - (vIndex + rowStart) * size.y;
         Vector2 offset = new Vector2(offsetX, offsetY);
         renderer.material.SetTextureOffset("_MainTex", offset);
         renderer.material.SetTextureScale("_MainTex", size);
     }