草摆动shader

Shader "Custom/Grass" {  
    Properties {  
        _MainTex ("Grass Texture", 2D) = "white" {}  
        _TimeScale ("Time Scale", float) = 0.2  
    }  
  
    SubShader{  
        Tags{"Queue"="Transparent" "RenderType"="Opaque" "IgnoreProject"="True"}  
        Pass{  
            Tags{"LightMode"="ForwardBase"}  
  
            ZWrite Off  
            Blend SrcAlpha OneMinusSrcAlpha  
            Cull Off  
  
            CGPROGRAM  
            #pragma vertex vert  
            #pragma fragment frag  
            #include "UnityCG.cginc"   
  
            sampler2D _MainTex;  
            half _TimeScale;  
  
            struct a2v {  
                float4 vertex : POSITION;  
                float4 texcoord : TEXCOORD0;  
            };  
              
            struct v2f {  
                float4 pos : SV_POSITION;  
                float2 uv : TEXCOORD0;  
            };  
  
  
            v2f vert(a2v v){  
                v2f o;  
                float4 offset = float4(0,0,0,0);  
                offset.z = sin(3.1415 * _Time.y * clamp(v.texcoord.y-0.5, 0, 1))  * _TimeScale;  
                o.pos = UnityObjectToClipPos(v.vertex + offset);  
                o.uv = v.texcoord.xy;  
                return o;  
            }  
  
            fixed4 frag(v2f i) : SV_Target{  
                return tex2D(_MainTex, i.uv);  
            }  
  
            ENDCG  
        }  
    }  
    FallBack Off  
} 

效果: