World of Zero Tiling Triplanar Shader

DungeonTriplanarShader.shader

// Upgrade NOTE: replaced '_World2Object' with 'unity_WorldToObject'

Shader "Custom/TriplanarWorldShader" {
	Properties {
		_Color ("Color", Color) = (1,1,1,1)
		_WallTexture("Wall Normal", 2D) = "bump" {}
		_CeilingTexture("Ceiling Normal", 2D) = "bump" {}
		_Glossiness ("Smoothness", Range(0,1)) = 0.5
		_Metallic ("Metallic", Range(0,1)) = 0.0
	}
	SubShader {
		Tags { "RenderType"="Opaque" }
		LOD 200
		
		CGPROGRAM
		// Physically based Standard lighting model, and enable shadows on all light types
		#pragma surface surf Standard fullforwardshadows

		// Use shader model 3.0 target, to get nicer looking lighting
		#pragma target 3.0

		sampler2D _WallTexture;
		sampler2D _CeilingTexture;

		struct Input {
			float3 worldPos;
			float3 worldNormal;
			INTERNAL_DATA
		};

		half _Glossiness;
		half _Metallic;
		fixed4 _Color;

		// Add instancing support for this shader. You need to check 'Enable Instancing' on materials that use the shader.
		// See https://docs.unity3d.com/Manual/GPUInstancing.html for more information about instancing.
		// #pragma instancing_options assumeuniformscaling
		UNITY_INSTANCING_CBUFFER_START(Props)
			// put more per-instance properties here
		UNITY_INSTANCING_CBUFFER_END

		void surf (Input IN, inout SurfaceOutputStandard o) {
			// Albedo comes from a texture tinted by color
			fixed3 normal = abs(WorldNormalVector(IN, float3(0, 0, 1)));
			fixed3 wallNormal = float3(0, 0, 1);
			if (normal.x > normal.y && normal.x > normal.z) {
				wallNormal = UnpackNormal(tex2D(_WallTexture, float2(IN.worldPos.y, IN.worldPos.z)));
			} else if (normal.y > normal.x && normal.y > normal.z) {
				wallNormal = UnpackNormal(tex2D(_WallTexture, float2(IN.worldPos.x, IN.worldPos.z)));
			} else {
				wallNormal = UnpackNormal(tex2D(_CeilingTexture, float2(IN.worldPos.x, IN.worldPos.y)));
			}

			o.Albedo = normal;
			// Metallic and smoothness come from slider variables
			o.Metallic = _Metallic;
			o.Smoothness = _Glossiness;
			o.Normal = wallNormal;
			o.Alpha = 1;
		}
		ENDCG
	}
	FallBack "Diffuse"
}