Shader "Custom/StandardDoubleSided"
{

	Properties
	{
		_Color("Color", Color) = (1,1,1,1)
		_MainTex("Albedo", 2D) = "white" {}
		_Cutoff("Alpha Cutoff", Range(0.0,1.0)) = 0.5
		_Glossiness("Smoothness", Range(0.0,1.0)) = 0.5
		_Metallic("Metallic", Range(0.0,1.0)) = 0.0
		_MetallicGlossMap("Metallic", 2D) = "white" {}
		_BumpScale("Scale", Float) = 1.0
		_BumpMap("Normal Map", 2D) = "bump" {}
		_EmissionColor("Color", Color) = (0,0,0)
		_EmissionMap("Emission", 2D) = "white" {}
		_DetailMask("Detail Mask", 2D) = "white" {}
		_DetailAlbedoMap("Detail Albedo", 2D) = "grey" {}
		_DetailNormalMapScale("Scale", Float) = 1.0
		_DetailNormalMap("Normal Map", 2D) = "bump" {}
	}

		SubShader
	{
		Tags { "RenderType" = "Opaque" }
		LOD 300

		// ✅ 关键：关闭背面剔除
		Cull Off

		CGPROGRAM
		#pragma surface surf Standard fullforwardshadows
		#pragma target 3.0

		sampler2D _MainTex;
		fixed4 _Color;
		half _Glossiness;
		half _Metallic;
		sampler2D _MetallicGlossMap;
		sampler2D _BumpMap;
		sampler2D _EmissionMap;
		fixed4 _EmissionColor;

		struct Input
		{
			float2 uv_MainTex;
			float2 uv_BumpMap;
			float2 uv_MetallicGlossMap;
			float2 uv_EmissionMap;
		};

		void surf(Input IN, inout SurfaceOutputStandard o)
		{
			fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
			o.Albedo = c.rgb;
			o.Metallic = _Metallic;
			o.Smoothness = _Glossiness;
			o.Normal = UnpackNormal(tex2D(_BumpMap, IN.uv_BumpMap));
			o.Emission = tex2D(_EmissionMap, IN.uv_EmissionMap).rgb * _EmissionColor.rgb;
			o.Alpha = c.a;
		}
		ENDCG
	}

		FallBack "Diffuse"
}