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 > 1)
            {
                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 = 4; //图片的中帧图片的行数
    public int colCount = 4; //图片的中帧图片的列数
    public int rowStart = 0; //开始播放的行下标
    public int colStart = 0; //开始播放的列下标
    public int totalCells = 4; //帧图片的总数
    public int fps = 10;  //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);
    }