Shader-透明效果-透明度混合

Shader "Unlit/AlphaBlend"
{
    Properties{
        _Color("Main Tint",Color) = (1,1,1,1)
        _MainTex("Main Tex", 2D) = "white"{}
        _AlphaScale("Alpha Scale", Range(0,1)) = 1
    }
        SubShader{
            Tags{"Queue" = "Transparent" "IgnoreProjector" = "True" "RenderType" = "Transparent"}
            Pass{
                Tags{"LightMode" = "ForwardBase"}
                ZWrite Off
                Blend SrcAlpha OneMinusSrcAlpha

                CGPROGRAM
                #pragma vertex vert
                #pragma fragment frag
                #include "Lighting.cginc"

                fixed4 _Color;
                sampler2D _MainTex;
                float4 _MainTex_ST;
                fixed _AlphaScale;

                struct a2v {
                    float4 vertex : POSITION;
                    fixed3 normal : NORMAL;
                    float4 texcoord : TEXCOORD0;
                };

                struct v2f {
                    float4 pos : SV_POSITION;
                    float3 worldNormal : TEXCOORD0;
                    float3 worldPos : TEXCOORD1;
                    float2 uv : TEXCOORD2;
                };

                v2f vert(a2v v) {
                    v2f o;
                    o.pos = UnityObjectToClipPos(v.vertex);
                    o.worldNormal = UnityObjectToWorldNormal(v.normal);
                    o.worldPos = mul(unity_ObjectToWorld, v.vertex);
                    o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
                    return o;
                }

                fixed4 frag(v2f i) :SV_Target{
                    fixed3 worldNormal = normalize(i.worldNormal);
                    fixed3 worldLightDir = normalize(UnityWorldSpaceLightDir(i.worldPos));
                    fixed4 texColor = tex2D(_MainTex, i.uv);
                    fixed3 albedo = texColor.rgb * _Color.rgb;
                    fixed3 diffuse = _LightColor0.rgb * albedo * max(0, dot(worldNormal, worldLightDir));
                    fixed3 ambient = UNITY_LIGHTMODEL_AMBIENT * albedo;
                    return fixed4(diffuse + ambient, texColor.a * _AlphaScale);
                }
                ENDCG
            }
        }
}

Pass{
                Tags{"LightMode" = "ForwardBase"}
                Cull Front

Pass{
                Tags{"LightMode" = "ForwardBase"}
                Cull Back