[unity] 유니티 쉐이더 공부 1

지난 번에 공부했던 <유니티 쉐이더 스타트업>의 내용을 정리해두지 않으면 올해 안에 완벽하게 까먹을 것 같아서

처음부터 기록+복습해보고자 한다. 

학교에서 GLSL은 조금(정말 조금) 배웠으니 이 책에서 surface shader를 배운 후에는 GLSL을 더 공부해 보는 것이 좋을 것 같다 

 

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Part 2

 

- 렌더링 파이프 라인

1.  오브젝트 데이터 받아오기

2. vertex shader

3. rasterizer

4. pixel shader/fragment shader

(학교에서 배운 내용!! 뻥 안치고 한 학기동안 파이프라인 100번은 들음)

 

 

Part 4

3d object로 sphere 만들기

surface shader이랑 material  만들기

sphere에 material을 적용한 모습(material에 shader 적용되어있음)

 

_Name()에서의 언더바는 외부에서 입력받았다는 것을 표시하기 위해 자주 쓰임

 

properties 만들어보기

 

Shader "NewShader"
{
    Properties
    {
        _Brightness("change Brightness!",Range(0,1))=0.5
        _TextFloat("test float",Float)=0.3
        _TextVector("test vector",Vector)=(1,1,1,1)
        _TestColor ("test Color", Color) = (1,1,1,1)
        _TestTexture("test texture",2D)="white"{}
        _Color ("Color", Color) = (1,1,1,1)
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
        _Glossiness ("Smoothness", Range(0,1)) = 0.5
        _Metallic ("Metallic", Range(0,1)) = 0.0
    }

        void surf (Input IN, inout SurfaceOutputStandard o)
        {
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
            o.Albedo = float3(1,0,0);
         
            o.Alpha = c.a;
        }

o.Albedo를 (1,0,0)으로 바꿈 

 

 

 

 

Albedo를 Emission으로 바꿈

Emission은 조명연산을 받지 않음 

 

   void surf (Input IN, inout SurfaceOutputStandard o)
        {
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
            o.Emission = float3(1,0,0);
         
            o.Alpha = c.a;
        }

 

 

 

 

 

 

 

---

 

변수 사용해보기

        void surf (Input IN, inout SurfaceOutputStandard o)
        {
            float4 test=float4(1,0,0,0);
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
            o.Albedo = test.rgb;
            o.Alpha = c.a;
        }

r과 g 바꿔보기

        void surf (Input IN, inout SurfaceOutputStandard o)
        {
            float4 test=float4(1,0,0,0);
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
            o.Albedo = test.grb;
            o.Alpha = c.a;
        }

 

 

  void surf (Input IN, inout SurfaceOutputStandard o)
        {
            float r=1;
            float2 gg=float2(0.5,0);
            float3 bbb=float3(1,0,1);
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
            o.Albedo =float3(r,0,0);
        
            o.Alpha = c.a;
        }

당연히...r=1으로 할당했으니까

 

        void surf (Input IN, inout SurfaceOutputStandard o)
        {
            float r=1;
            float2 gg=float2(0.5,0);
            float3 bbb=float3(1,0,1);
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
            o.Albedo =float3(0,gg);
        
            o.Alpha = c.a;
        }

 

Shader "Custom/shader5"
{
    Properties
    {
        _Color ("Color", Color) = (1,1,1,1)
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
        _Glossiness ("Smoothness", Range(0,1)) = 0.5
        _Metallic ("Metallic", Range(0,1)) = 0.0
        _TestColor("testcolor",Color)=(1,1,1,1)
    }
    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;

        struct Input
        {
            float2 uv_MainTex;
        };

        half _Glossiness;
        half _Metallic;
        fixed4 _Color;
        fixed4 _TestColor;


        void surf (Input IN, inout SurfaceOutputStandard o)
        {

            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
            o.Albedo = _TestColor.rgb;
            o.Metallic = _Metallic;
            o.Smoothness = _Glossiness;
            o.Alpha = c.a;
        }
        ENDCG
    }
    FallBack "Diffuse"
}

 

 

Shader "Custom/shader6"
{
    Properties
    {
        _Color ("Color", Color) = (1,1,1,1)
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
        _Glossiness ("Smoothness", Range(0,1)) = 0.5
        _Metallic ("Metallic", Range(0,1)) = 0.0
        _Red("red",Range(0,1))=0
        _Green("green",Range(0,1))=0
        _Blue("blue",Range(0,1))=0
    }
    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;

        struct Input
        {
            float2 uv_MainTex;
        };

        half _Glossiness;
        half _Metallic;
        fixed4 _Color;
        float _Red;
        float _Green;
        float _Blue;

        void surf (Input IN, inout SurfaceOutputStandard o)
        {
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
            o.Albedo = float3(_Red,_Green,_Blue);
         
            o.Alpha = c.a;
        }
        ENDCG
    }
    FallBack "Diffuse"
}

 

 

 

Shader "Custom/shader7"
{
    Properties
    {
        _Color ("Color", Color) = (1,1,1,1)
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
        _Glossiness ("Smoothness", Range(0,1)) = 0.5
        _Metallic ("Metallic", Range(0,1)) = 0.0
        _Red("red",Range(0,1))=0
        _Green("green",Range(0,1))=0
        _Blue("blue",Range(0,1))=0
        _BrightDark("brightness & darkness",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;

        struct Input
        {
            float2 uv_MainTex;
        };

        half _Glossiness;
        half _Metallic;
        fixed4 _Color;

        float _Red;
        float _Green;
        float _Blue;

        float _BrightDark;

        void surf (Input IN, inout SurfaceOutputStandard o)
        {
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
            o.Albedo = float3(_Red,_Green,_Blue)+_BrightDark;
         
            o.Alpha = c.a;
        }
        ENDCG
    }
    FallBack "Diffuse"
}

_BrightDark("brightness & darkness",Range(-1,1))=0.5

어두워질 수 있도록 수정

 

 

좀 더 깔끔하게 지우기

Shader "Custom/shader8"
{
    Properties
    {
        _Red("red",Range(0,1))=0
        _Green("green",Range(0,1))=0
        _Blue("blue",Range(0,1))=0
        _BrightDark("brightness & darkness",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

        struct Input
        {
             float4 color:COLOR;
        };

        float _Red;
        float _Green;
        float _Blue;

        float _BrightDark;

        void surf (Input IN, inout SurfaceOutputStandard o)
        {
            o.Albedo = float3(_Red,_Green,_Blue)+_BrightDark;
            o.Alpha =1;
        }
        ENDCG
    }
    FallBack "Diffuse"
}

깔끔!

Shader "Custom/shader8"
{
    Properties
    {
        _Red("red",Range(0,1))=0
        _Green("green",Range(0,1))=0
        _Blue("blue",Range(0,1))=0
        _BrightDark("brightness & darkness",Range(0,1))=0.5
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }

        CGPROGRAM
        #pragma surface surf Standard fullforwardshadows

        struct Input
        {
             float4 color:COLOR;
        };

        float _Red;
        float _Green;
        float _Blue;

        float _BrightDark;

        void surf (Input IN, inout SurfaceOutputStandard o)
        {
            o.Albedo = float3(_Red,_Green,_Blue)+_BrightDark;
            o.Alpha =1;
        }
        ENDCG
    }
    FallBack "Diffuse"
}

더 깔끔!