<!-- BEGIN COPY / PASTE -->
    // Example: Simplified Lambertian Lighting Shader
    Shader "Custom/SimpleLambert"
    {
      Properties
      {
        _MainTex ("Texture", 2D) = "white" {}
      }
      SubShader
      {
        Tags { "RenderType"="Opaque" }
        LOD 200

        Pass
        {
          CGPROGRAM
          #pragma vertex vert
          #pragma fragment frag

          #include "UnityCG.cginc"

          struct appdata_t
          {
            float4 vertex : POSITION;
            float3 normal : NORMAL;
            float2 uv : TEXCOORD0;
          };

          struct v2f
          {
            float2 uv : TEXCOORD0;
            float3 normal : TEXCOORD1;
            float4 pos : SV_POSITION;
          };

          sampler2D _MainTex;
          float4 _MainTex_ST;

          v2f vert (appdata_t v)
          {
            v2f o;
            o.pos = UnityObjectToClipPos(v.vertex);
            o.uv = TRANSFORM_TEX(v.uv, _MainTex);
            o.normal = UnityObjectToWorldNormal(v.normal);
            return o;
          }

          half4 frag (v2f i) : SV_Target
          {
            half3 lightDir = normalize(_WorldSpaceLightPos0.xyz);
            half lambert = max(0, dot(i.normal, lightDir));
            half3 tex = tex2D(_MainTex, i.uv).rgb;
            return half4(tex * lambert, 1.0);
          }
          ENDCG
        }
      }
    }
    <!-- END COPY / PASTE -->