Cg入门23： Fragment shader – UV动画（序列帧）

让动画从1-9循环播放此纹理

watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />

源码：

Shader "Sbin/FragmentAnim"

{

	Properties

	{

		_MainTex ("Texture", 2D) = "white" {}

	}

	SubShader

	{

		Pass

		{

			CGPROGRAM

			#pragma vertex vert

			#pragma fragment frag

			#include "UnityCG.cginc"

			sampler2D _MainTex;

			float4 _MainTex_ST;//纹理缩放偏移向量(Unity默认此变量赋值,变量名规则：纹理名_ST)

			struct v2f{

				float4 pos:POSITION;

				float2 uv:TEXCOORD0;

			};

			v2f vert (appdata_full v)

			{

				v2f o;

				o.pos = mul(UNITY_MATRIX_MVP, v.vertex);

				o.uv = v.texcoord.xy * _MainTex_ST.xy + _MainTex_ST.zw;

				return o;

			}

			fixed4 frag (v2f v) : COLOR

			{

				fixed4 col = tex2D(_MainTex, v.uv);//第一个參数：纹理。第二个參数UV向量

				return col;

			}

			ENDCG

		}

	}

}

using UnityEngine;

using System.Collections;

public class FragmentAnim : MonoBehaviour

{

    public int rowCount;    //行数

    public int columCount;  //列数

    public int fps;         //播放速度

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

    IEnumerator Start()

    {

        Material mat = GetComponent<Renderer>().material;

        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;

            float offset_y = currentIndex / rowCount * itemHeight;

            mat.SetTextureScale("_MainTex", new Vector2(itemWidth, itemHeight));

            mat.SetTextureOffset("_MainTex", new Vector2(offset_x, offset_y));

            yield return new WaitForSeconds(1 / fps);

            currentIndex = (++currentIndex) % (rowCount * columCount);

        }

    }

}