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：