[Unity/Shader] 파트8-5 : 멀티 텍스쳐링 (버텍스 컬러 적용)

버텍스 컬러를 이용해 여러 텍스쳐를 혼합한다.

그냥 lerp한 것이다.

 

코드

Shader "Custom/part8-5"

{

    Properties

    {

        _MainTex ("Albedo (RGB)", 2D) = "white" {}

        _MainTex2 ("Albedo (RGB)", 2D) = "white" {}

        _MainTex3 ("Albedo (RGB)", 2D) = "white" {}

        _MainTex4 ("Albedo (RGB)", 2D) = "white" {}

        _BumpMap ("Normalmap", 2D) = "bump" {}

        _Metallic ("Metallic", range(0,1)) = 0.5

        _Smoothness ("Smoothness", range(0,1)) = 0.5

    }

    SubShader

    {

        Tags { "RenderType"="Opaque" }

        LOD 200

        CGPROGRAM

        // Physically based Standard lighting model, and enable shadows on all light types

        #pragma surface surf Standard fullforwardshadows

        // Use shader model 3.0 target, to get nicer looking lighting

        #pragma target 3.0

        sampler2D _MainTex;

        sampler2D _MainTex2;

        sampler2D _MainTex3;

        sampler2D _MainTex4;

        sampler2D _BumpMap;

        float _Metallic;

        float _Smoothness;

        struct Input

        {

            float2 uv_MainTex;

            float2 uv_MainTex2;

            float2 uv_MainTex3;

            float2 uv_MainTex4;

            float2 uv_BumpMap;

            float4 color:COLOR;

        };

        UNITY_INSTANCING_BUFFER_START(Props)

            // put more per-instance properties here

        UNITY_INSTANCING_BUFFER_END(Props)

        void surf (Input IN, inout SurfaceOutputStandard o)

        {

            fixed4 c = tex2D (_MainTex, IN.uv_MainTex);

            fixed4 d = tex2D (_MainTex2, IN.uv_MainTex);

            fixed4 e = tex2D (_MainTex3, IN.uv_MainTex);

            fixed4 f = tex2D (_MainTex4, IN.uv_MainTex);

            o.Albedo = lerp(c.rgb, d.rgb, IN.color.r);

            o.Albedo = lerp(o.Albedo, e.rgb, IN.color.g);

            o.Albedo = lerp(o.Albedo, f.rgb, IN.color.b);

            o.Normal = UnpackNormal(tex2D(_BumpMap, IN.uv_BumpMap));

           

            // 스페큘러가 없으면 질감을 느끼기 힘들다. 그래서 아래 두개를 추가한다.

            o.Metallic = _Metallic;

            o.Smoothness = _Smoothness;

            o.Alpha = c.a;

        }

        ENDCG

    }

    FallBack "Diffuse"

}