[5.3] Shader 연습 1

Test1 / Test2 (Lerp Ratio : 50%) / Test3

Test1.shader

Shader "Custom/Test"
{
    Properties
    {
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 200

        CGPROGRAM
        #pragma surface surf Standard fullforwardshadows

        sampler2D _MainTex;

        struct Input
        {
            float2 uv_MainTex;
        };

        void surf (Input IN, inout SurfaceOutputStandard o)
        {
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex);
            o.Albedo = c.rgb;
            o.Alpha = c.a;
        }
        ENDCG
    }
    FallBack "Diffuse"
}

Test2.shader

Shader "Custom/Test2"
{
    Properties
    {
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
        _SubTex ("Albedo (RGB)", 2D) = "white" {}
        _LerpRatio ("Lerp Ratio", Range(0,1)) = 0
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 200

        CGPROGRAM
        #pragma surface surf Standard fullforwardshadows

        sampler2D _MainTex;
        sampler2D _SubTex;
        float _LerpRatio;

        struct Input
        {
            float2 uv_MainTex;
            float2 uv_SubTex;
        };

        void surf (Input IN, inout SurfaceOutputStandard o)
        {
            fixed4 m = tex2D (_MainTex, IN.uv_MainTex);
            fixed4 s = tex2D(_SubTex, IN.uv_SubTex);
            o.Albedo = lerp(m.rgb, s.rgb, _LerpRatio);
        }
        ENDCG
    }
    FallBack "Diffuse"
}

Test3.shader

Shader "Custom/Test3"
{
    Properties
    {
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
        _SubTex("Albedo (RGB)", 2D) = "white" {}
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 200

        CGPROGRAM
        #pragma surface surf Standard fullforwardshadows

        sampler2D _MainTex;
        sampler2D _SubTex;

        struct Input
        {
            float2 uv_MainTex;
            float2 uv_SubTex;
        };

        void surf (Input IN, inout SurfaceOutputStandard o)
        {
            fixed4 m = tex2D (_MainTex, IN.uv_MainTex);
            fixed4 s = tex2D(_SubTex, IN.uv_SubTex);
            o.Albedo = lerp(m.rgb, s.rgb, 1 - m.a);
        }
        ENDCG   
    }
    FallBack "Diffuse"
}

 

* Lerp Function

lerp - returns linear interpolation of two scalars or vectors based on a weight

developer.download.nvidia.com/cg/lerp.html

lerp

lerp(a,b,w) => a + w * ( b - a )

---

땅 색깔 바꾸기

결과

Test3.shader

Shader "Custom/Test3"
{
	Properties
	{
		_MainTex("Albedo (RGB)", 2D) = "white" {}
		_SubTex("Albedo (RGB)", 2D) = "white" {}
		_Brightness("Brightness", Range(0,1)) = 0
	}
		SubShader
		{
			Tags { "RenderType" = "Opaque" }
			LOD 200

			CGPROGRAM
			#pragma surface surf Standard fullforwardshadows

			sampler2D _MainTex;
			sampler2D _SubTex;
			float _Brightness;

			struct Input
			{
				float2 uv_MainTex;
				float2 uv_SubTex;
			};

			void surf(Input IN, inout SurfaceOutputStandard o)
			{
				fixed4 m = tex2D(_MainTex, IN.uv_MainTex);
				fixed4 s = tex2D(_SubTex, IN.uv_SubTex);
				o.Albedo = lerp(m.rgb, s.rgb * float3(1, _Brightness, 0), 1 - m.a);
			}
			ENDCG
		}
			FallBack "Diffuse"
}

 

 

---

 

땅 색갈을 흑백으로 만들기

Shader "Custom/Test3"
{
	Properties
	{
		_MainTex("Albedo (RGB)", 2D) = "white" {}
		_SubTex("Albedo (RGB)", 2D) = "white" {}
		_Brightness("Brightness", Range(0,1)) = 0
	}
		SubShader
		{
			Tags { "RenderType" = "Opaque" }
			LOD 200

			CGPROGRAM
			#pragma surface surf Standard fullforwardshadows

			sampler2D _MainTex;
			sampler2D _SubTex;
			float _Brightness;

			struct Input
			{
				float2 uv_MainTex;
				float2 uv_SubTex;
			};

			void surf(Input IN, inout SurfaceOutputStandard o)
			{
				fixed4 m = tex2D(_MainTex, IN.uv_MainTex);
				fixed4 s = tex2D(_SubTex, IN.uv_SubTex);
				o.Albedo = lerp(m.rgb, (s.r + s.g + s.b) / 3 * _Brightness, 1 - m.a);
			}
			ENDCG
		}
			FallBack "Diffuse"
}