<!-- BEGIN COPY / PASTE -->
    // Example: Simplified Phong Lighting Shader
    Shader "Custom/SimplePhong" {
      Properties {
        _Color ("Color", Color) = (1,1,1,1)
        _MainTex ("Albedo (RGB)", 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;
          };

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

          fixed4 _Color;
          sampler2D _MainTex;

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

          fixed4 frag (v2f i) : SV_Target {
            fixed3 lightDir = normalize(_WorldSpaceLightPos0.xyz);
            fixed diff = max(0, dot(i.normal, lightDir));
            fixed4 tex = tex2D(_MainTex, i.normal.xy);
            return tex * _Color * diff;
          }
          ENDCG
        }
      }
    }
    <!-- END COPY / PASTE -->