Shader Cell - Iluminación personalizada.

CellShading.shader

Shader "NinePlus/CellShading"
{
	Properties
	{
		_MainTex("Albedo (RGB)", 2D) = "white" {}
		_RampTex("Ramp", 2D) = "white" {}
		_CelShadingLevels("Cel Shading Levels", Range(0,15)) = 5
	}
		SubShader
		{
			Tags { "RenderType" = "Opaque" }
			LOD 200

			CGPROGRAM
			// En lugar de Standart, apunta a una funcion llamada LightingToon()
			#pragma surface surf Toon

			#pragma target 3.0

			sampler2D _MainTex;
			sampler2D _RampTex;
			float _CelShadingLevels;

			struct Input
			{
				float2 uv_MainTex;
			};

			void surf(Input IN, inout SurfaceOutput o)
			{
				o.Albedo = tex2D(_MainTex, IN.uv_MainTex).rgb;
			}

			half4 LightingToon(SurfaceOutput s, half3 lightDir, half atten)
			{
				half NdotL = dot(s.Normal, lightDir);
				// Ajustar el nivel de iluminacion
				half cel = floor(NdotL * _CelShadingLevels) / (_CelShadingLevels - 0.5);

				half4 c;
				c.rgb = s.Albedo * _LightColor0.rgb * (cel * atten * 1);
				c.a = s.Alpha;

				return c;
			}
			ENDCG
		}
			FallBack "Diffuse"
}