【Unity】表裏両面に別々のテクスチャを貼っつけるシェーダ【Shader】

Reversible.shader

Shader "Unlit/Reversible"
{
	Properties
	{
		_MainTexA ("TextureA", 2D) = "white" {}
		_MainTexB ("TextureB", 2D) = "white" {}
	}
	SubShader
	{
		Tags { "RenderType"="Opaque" }
		LOD 100
		Cull off//カリング処理をOFFに。

		Pass
		{
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag

			struct appdata
			{
				float4 vertex : POSITION;
				float2 uv : TEXCOORD0;
			};

			struct v2f
			{
				float2 uv : TEXCOORD0;
				float4 vertex : SV_POSITION;
			};

			sampler2D _MainTexA;
			sampler2D _MainTexB;
			float4 _MainTex_ST;
			
			v2f vert (appdata v)
			{
				v2f o;
				o.vertex = UnityObjectToClipPos(v.vertex);
				o.uv = v.uv;
				return o;
			}
			
			fixed4 frag (v2f i, fixed facing : VFACE) : SV_Target
			{								
				return (facing > 0) ? tex2D(_MainTexA, i.uv) : tex2D(_MainTexB, i.uv);
				//facing>0の時は表、facing<=0の時は裏
			}
			ENDCG
		}
	}
}