Unity shader学习之Alpha Test的阴影

Alpha Test的阴影，

shader如下：

// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'Shader "Custom/Alpha Test Shadow"
{
    Properties
    {
        _Color ("Main Color", Color) = (,,,)          // 必需
        _MainTex("Main Texture", 2D) = "white" {}
        _Cutoff ("Alpha cutoff", Range(,)) = 0.5        // 必需
    }    SubShader
    {
        Tags
        {
            "Queue" = "AlphaTest"
            "RenderType" = "TransparentCutout"
        }        Pass
        {
            Tags
            {
                "LightMode" = "ForwardBase"
            }
            Cull Off                                    // 背面            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #pragma multi_compile_fwdbase            #include "UnityCG.cginc"
            #include "Lighting.cginc"
            #include "AutoLight.cginc"            float4 _Color;
            sampler2D _MainTex;
            float _Cutoff;            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
                float3 normal : NORMAL;
            };            struct v2f
            {
                float4 pos : SV_POSITION;
                float2 uv : TEXCOORD0;
                float3 worldNormal : TEXCOORD1;
                float3 worldPos : TEXCOORD2;
                SHADOW_COORDS()
            };            v2f vert(appdata v)
            {
                v2f o;
                o.pos = UnityObjectToClipPos(v.vertex);
                o.uv = v.uv;
                o.worldNormal = UnityObjectToWorldNormal(v.normal);
                o.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
                TRANSFER_SHADOW(o);
                return o;
            }            fixed4 frag(v2f i) : SV_TARGET
            {
                fixed4 albedo = tex2D(_MainTex, i.uv) * _Color;                clip(albedo.a - _Cutoff);                fixed3 ambient = albedo.rgb * UNITY_LIGHTMODEL_AMBIENT.rgb;                float3 worldLight = UnityWorldSpaceLightDir(i.worldPos);
                fixed3 diff = albedo.rgb * _LightColor0.rgb * max(, dot(i.worldNormal, worldLight));                UNITY_LIGHT_ATTENUATION(atten, i, i.worldPos);                fixed3 col = ambient + diff * atten;                return fixed4(col, );
            }            ENDCG
        }
    }    Fallback "Transparent/Cutout/VertexLit"                    // 必需，阴影投射pass
}

效果如下：