Demo 56 - Triplanar mapping

Shader "Custom/Triplanar" {
    Properties {
        _Texture1 ("Texture 1", 2D) = "white" {}
        _Texture2 ("Texture 2", 2D) = "white" {}
        _Texture3 ("Texture 3", 2D) = "white" {}
        _Scale ("Scale", Range(0.001, 0.2)) = 0.1
    }
    SubShader {
        Tags { "RenderType"="Opaque" }

        CGPROGRAM
        #pragma surface surf Standard

        sampler2D _Texture1;
        sampler2D _Texture2;
        sampler2D _Texture3;
        float _Scale;

        struct Input {
            float2 uv_MainTex;
            float3 worldNormal;
            float3 worldPos;
        };

        void surf (Input IN, inout SurfaceOutputStandard o) {

            fixed4 col1 = tex2D(_Texture2, IN.worldPos.yz * _Scale);
            fixed4 col2 = tex2D(_Texture1, IN.worldPos.xz * _Scale);
            fixed4 col3 = tex2D(_Texture3, IN.worldPos.xy * _Scale);

            float3 vec = abs(IN.worldNormal);
            vec /= vec.x + vec.y + vec.z + 0.001f;
            fixed4 col = vec.x * col1 + vec.y * col2 + vec.z * col3;

            o.Albedo = col;
            o.Emission = col;
        }

        ENDCG
    }
    FallBack "Diffuse"
}