Unity3D之UV动画

using UnityEngine;
using System.Collections;
public enum OffsetDirection
{
    none,
    X,
    Y,
    XY,
    negativeX,
    negativeY
}

public class UVoffset : MonoBehaviour {
    public Material mat_UVMaterial;
    public float scrollSpeed = 1.0f;
    public OffsetDirection dir = OffsetDirection.none;
    private float offsetX = 0.0f;
    private float offsetY = 0.0f;

    void Start()
    {
        if (renderer.materials.Length == 1)  //代表有一种材质
        {
            mat_UVMaterial = renderer.material;
        }
        else if(mat_UVMaterial==null)
        {
            Debug.LogError("存在多个材质球，请选择一个材质球进行UV变换");
        }
    }
    
    // Update is called once per frame
    void Update () {
        switch(dir)
        {
            case OffsetDirection.none:
                offsetX = 0;
                offsetY = 0;
                break;
            case OffsetDirection.X:
                offsetX += scrollSpeed * Time.deltaTime;
                offsetY = 0;
                break;
            case OffsetDirection.Y:
                offsetX = 0;
                offsetY += scrollSpeed * Time.deltaTime;
                break;
            case OffsetDirection.XY:
                offsetX += scrollSpeed * Time.deltaTime;
                offsetY += scrollSpeed * Time.deltaTime;
                break;
            case OffsetDirection.negativeX:
                offsetX -= scrollSpeed * Time.deltaTime;
                break;
            case OffsetDirection.negativeY:
                offsetY -= scrollSpeed * Time.deltaTime;
                break;
        }
        mat_UVMaterial.SetTextureOffset("_MainTex", new Vector2(offsetX, offsetY));
    }
}