序列帧动画

在Unity实现序列帧动画制作的方法：

1. 编写C#脚本控制
2. 用UnityShader变换UV

第一种方法用C#脚本去编写：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class FragmentAnim : MonoBehaviour {
    /// <summary>
    /// 动画帧
    /// </summary>

    public int fps;         //播放速度

    [SerializeField]
    private int rowCount;    //行数
    [SerializeField]
    private int columCount;  //列数

    private int currentIndex;//当前播放索引值

    void Start()
    {
        StartCoroutine(Fragment(fps));
    }

    IEnumerator Fragment(float fps)
    {
        Material mat = transform.GetComponent<Renderer>().material;

        currentIndex = rowCount * columCount;
        //播放顺序9——>1
        //3 2 1
        //6 5 4
        //9 8 7

        float itemWidth = 1.0f / rowCount;      //每一帧宽度
        float itemHeight = 1.0f / columCount;   //每一帧高度

        while (true)
        {
            float offset_x = currentIndex %columCount * itemWidth;//x偏移量=当前索引值%列数*每帧宽度
            float offset_y = currentIndex / rowCount * itemHeight;//y偏移量=当前索引值%行数*每帧高度

            mat.SetTextureScale("_MainTex", new Vector2(itemWidth, itemHeight));//片大小缩放
            mat.SetTextureOffset("_MainTex", new Vector2(offset_x, offset_y));//片偏移计算

            yield return new WaitForSeconds(1 / fps);

            currentIndex = (++currentIndex) % (rowCount * columCount);//完成一次循环后索引归零
        }
    }
}

 注：我的Unity2017.1.0f3版本截图如下

第二种方法用Shader去编写：

参考：http://www.cnblogs.com/hellohuan/p/3512784.html，感谢！

Shader "2D/FragmentAnim" {
    Properties{
        _Color("Main Color", Color) = (1,1,1,1)
        _MainTex("Base (RGB) Trans (A)", 2D) = "white" {}
        _SizeX("列数", Float)  =4
        _SizeY("行数", Float)  =4
        _Speed("播放速度", Float) = 200
    }

        SubShader{
        Tags{ "RenderType" = "Opaque" }
        LOD 200

        CGPROGRAM
#pragma surface surf Lambert alpha

        sampler2D _MainTex;
        fixed4 _Color;

    uniform fixed _SizeX;
    uniform fixed _SizeY;
    uniform fixed _Speed;

    struct Input {
        float2 uv_MainTex;
    };

    void surf(Input IN, inout SurfaceOutput o) {

        int index = floor(_Time.x * _Speed);
        int indexY = index / _SizeX;
        int indexX = index - indexY*_SizeX;
        float2 testUV = float2(IN.uv_MainTex.x / _SizeX, IN.uv_MainTex.y / _SizeY);

        testUV.x += indexX / _SizeX;
        testUV.y += indexY / _SizeY;

        fixed4 c = tex2D(_MainTex, testUV) * _Color;
        o.Albedo = c.rgb;

        o.Alpha = c.a;
        //o.Albedo = float3( floor(_Time .x * _Speed) , 1.0, 1.0);
    }
    ENDCG
    }

        Fallback "Transparent/VertexLit"
}

注：我的Unity2017.1.0f3版本截图如下