Unity用法線可視化シェーダー

WorldNormal.shader

// MIT License (c) http://github.com/esnya

Shader "Unlit/WorldNormal"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _BumpMap ("Texture", 2D) = "bump" {}
        _BumpScale ("Normal Scale", Range(0, 1))  = 1.0
        _MixFactor ("Mix Factor", Range(0, 1)) = 1
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 100

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            // make fog work
            #pragma multi_compile_fog

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                float3 normal : NORMAL;
                float2 uv : TEXCOORD;
            };

            struct v2f
            {
                float4 vertex : SV_POSITION;
                float3 normal : NORMAL;
                float2 uv : TEXCOORD;
                UNITY_FOG_COORDS(1)
            };

            sampler2D _MainTex;
            float4 _MainTex_ST;
            sampler2D _BumpMap;
            float4 _BumpMap_ST;
            float _BumpScale;
            float _MixFactor;

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.normal = v.normal;
                o.uv = v.uv;
                UNITY_TRANSFER_FOG(o,o.vertex);
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                fixed3 normal = normalize(i.normal + UnpackNormal(tex2D(_BumpMap, i.uv)) * _BumpScale);
                fixed4 col = lerp(tex2D(_MainTex, i.uv), fixed4(normal, 1), _MixFactor);
                // apply fog
                UNITY_APPLY_FOG(i.fogCoord, col);
                return col;
            }
            ENDCG
        }
    }
}