Diffuse Warping 기법

 

Shader "Custom/Warp"
{
    Properties
    {
        
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
        _RampTex ("Ramp", 2D) = "white" {}
       
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }
       

        CGPROGRAM
  
        #pragma surface surf _Warp //커스텀라이트

   
        #pragma target 3.0

        sampler2D _MainTex;
        sampler2D _RampTex;

        struct Input
        {
            float2 uv_MainTex;
        };

        void surf (Input IN, inout SurfaceOutput o)
        {
           
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex);
            o.Albedo = c.rgb;          
            o.Alpha = c.a;
        }

        //커스텀라이트
          float4 Lighting_Warp(SurfaceOutput s,float3 lightDir,float atten)
        {
            //Lambert
            float ndotl =dot(s.Normal,lightDir); 
            // Warping 기법 
            float2 uv = float2(ndotl,0.5); 
            float4 ramp = tex2D(_RampTex,uv); 


            return ramp;
        }


        ENDCG
    }
    FallBack "Diffuse"
}