[5.7] Warped Diffuse

팀 포트리스 2

빛 공식으로 쓰이는 Normal과 Light Vector의 내적을 UV 사용한다.

각각 다른 방향에서 보았을 때의 변화와 텍스쳐(Bump 포함)를 적용했을 때의 결과

 

Ramp라는 텍스쳐의 UV를 ndotl의 값으로 사용한다.

Shader "Custom/Test"
{
    Properties
    {
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
        _RampTex ("Ramp Texture", 2D) = "white" {}
        _BumpTex ("Bump Texture", 2D) = "bump" {}
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }

        CGPROGRAM
        #pragma surface surf _Diff noambient

        sampler2D _MainTex;
        sampler2D _RampTex;
        sampler2D _BumpTex;

        struct Input
        {
            float2 uv_MainTex;
            float2 uv_RampTex;
            float2 uv_BumpTex;
        };

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

        float4 Lighting_Diff(SurfaceOutput s, float3 lightDir, float atten)
        {
            float ndotl = dot(s.Normal, lightDir);
            float4 ramp = tex2D (_RampTex, float2(ndotl, 0.5));

            float4 final;
            final.rgb = ramp * s.Albedo;
            final.a = s.Alpha;

            return final;
        }
        ENDCG
    }
    FallBack "Diffuse"
}

---

Specular 적용

Shader "Custom/Test"
{
    Properties
    {
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
        _WarpTex ("Warp Texture", 2D) = "white" {}
        _BumpTex ("Bump Texture", 2D) = "white" {}
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }

        CGPROGRAM
        #pragma surface surf _Warp noambient

        sampler2D _MainTex;
        sampler2D _WarpTex;
        sampler2D _BumpTex;

        struct Input
        {
            float2 uv_MainTex;
            float2 uv_WarpTex;
            float2 uv_BumpTex;
        };

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

        float4 Lighting_Warp(SurfaceOutput s, float3 lightDir, float3 viewDir, float atten)
        {
            float ndotl = dot(s.Normal, lightDir) * 0.5 + 0.5;

            float3 h = lightDir + viewDir;
            float spec = saturate(dot(s.Normal, h));

            float4 ramp = tex2D (_WarpTex, float2(ndotl, spec));

            float4 final;
            final.rgb = (s.Albedo.rgb * ramp.rgb) + (ramp.rgb * 0.25);
            final.a = s.Alpha;

            return final;
        }
        ENDCG
    }
    FallBack "Diffuse"
}