FakeTubeishLight Shader

FakeTubeishLight.shader

Shader "Custom/FakeTubeishLight"
{
	Properties
	{
		_MainTex ("Texture", 2D) = "white" {}
	}
	SubShader
	{
		Tags { "RenderType"="Opaque" }
		LOD 100
			CGPROGRAM
			#pragma surface surf SimpleSpecular

			half4 LightingSimpleSpecular (SurfaceOutput s, half3 lightDir, half3 viewDir, half atten) {

				half4 c = half4(0,0,0,0);

				int steps = 16;

				// sample light many times with different values
				for(int i=0;i<steps;i++)
				{

					half3 l = lerp(half3(1,1,i),half3(i,1,1),fmod(_Time.x*10,1));
					half3 h = normalize (lightDir*l + viewDir);
					half diff = max (0, dot (s.Normal, lightDir*l));
					float nh = max (0, dot (s.Normal, h));
					float spec = pow (nh, 10.0);

					c.rgb += (s.Albedo * _LightColor0.rgb * diff + _LightColor0.rgb * spec) * atten;
				}

				c.rgb /=steps;

				c.a = s.Alpha;
				return c;
			}


			struct Input {
				float2 uv_MainTex;
			};
    
			sampler2D _MainTex;
    
			void surf (Input IN, inout SurfaceOutput o) {
				o.Albedo = tex2D (_MainTex, IN.uv_MainTex).rgb;
			}
			ENDCG
	}
}