在上一篇帖子的基础上增加一张法线贴图即可：

Shader "James/Scene/Bumped_Diffuse"{    Properties    {        _MainTex ("Base (RGB)", 2D) = "white" {}        _BumpTex("Normal Map", 2D) = "bump" {}        _MainLightColor("主光颜色", Color) = (1,1,1,1)        _MainLightDir("主光方向", Vector) = (1,1,0,0)        _MainLightBrightness ("主光强度", Range(0, 10)) = 1    }        SubShader    {        Tags { "RenderType"="Opaque" "Queue"="Geometry" }        LOD 200                Pass        {            Tags { "LightMode"="ForwardBase" }            Lighting Off                        CGPROGRAM            #pragma fragmentoption ARB_precision_hint_fastest                        #pragma vertex vert            #pragma fragment frag            #pragma multi_compile_fog                        #include "UnityCG.cginc"            float4 _MainLightColor;            float4 _MainLightDir;            float _MainLightBrightness;            uniform sampler2D _MainTex, _BumpTex;            uniform half4 _MainTex_ST, _BumpTex_ST;            struct vertexIN_base            {                float4 vertex : POSITION;                float3 normal : NORMAL;                float4 tangent : TANGENT;                float2 texcoord : TEXCOORD0;            };                        struct v2f_base            {                float4 pos : SV_POSITION;                half2  uv : TEXCOORD0;                half4 tangentWorld : TEXCOORD1;                half4 normalWorld : TEXCOORD2;                half4 binormalWorld : TEXCOORD3;                UNITY_FOG_COORDS(5)            };            v2f_base vert(vertexIN_base v)            {                v2f_base o;                o.pos = UnityObjectToClipPos(v.vertex);                o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);                o.tangentWorld.xyz = normalize(mul(unity_ObjectToWorld, half4(v.tangent.xyz, 0.0)).xyz);                o.normalWorld.xyz = normalize(mul(unity_ObjectToWorld, half4(v.normal, 0.0)).xyz);                o.binormalWorld.xyz = cross(o.normalWorld.xyz, o.tangentWorld.xyz) * v.tangent.w;                UNITY_TRANSFER_FOG(o,o.pos);                return o;             }                        fixed4 frag(v2f_base i) : COLOR            {                float3 bump = UnpackNormal(tex2D(_BumpTex,TRANSFORM_TEX(i.uv, _BumpTex)));                half3x3 local2WorldTranspose = half3x3(i.tangentWorld.xyz, i.binormalWorld.xyz, i.normalWorld.xyz);                half3 worldNormal = normalize(mul(bump, local2WorldTranspose));                float diffuse = max(0, dot(normalize(worldNormal), normalize(_MainLightDir)));                fixed4 mainColor = tex2D(_MainTex, i.uv);                fixed4 clr = mainColor * _MainLightColor * diffuse * _MainLightBrightness;                UNITY_APPLY_FOG(i.fogCoord,clr);                return clr;            }            ENDCG        }    }    FallBack Off}