Unity Shader (Surface Shader Surface Shader)

basic data type

float	32-bit floating point number	float2——float2(float,float) float3——float3(float,float,float) float4——float4(float,float,float,float)
half	16-bit floating point number	half2——half2(half,half) half3——half3(half,half,half) half4——half4(half,half,half,half)
int	32-bit integer	int2——int2(int,int) int3——int3(int,int,int) int4 —— int4 (int, int, int, int)
fixed	12-bit fixed point	A decimal between 0-1, or an integer
bool	Boolean value
string	string
sampler2D	texture object

pragma

CGPROGRAM (beginning)
#pragma surface surfaceFunction lightModel[optionalparams] || #pragma surface surf Lambert #compiler directive shader name function name lighting model special settings	surfaceFunction function name
	lightModel light type - Lambert diffuse reflection
	void surf(Input IN,inout SurfaceOutput o)
ENDCG (end)

Input Structure

float2	uv_MainTex	Texture Map UVs The naming method must be uv+map variable name (_MainTex)
float3	viewDir	view direction
	worldPos	world position
float4	screenPos	screen coordinates
	color:COLOR (semantic binding)	Interpolated color for each vertex

Surface Output

half3	Albedo	反射率，即颜色纹理rgb
	Normal	法线，法向量（x,y,z）
	Emission	自发光颜色rgb
half	Specular	镜面反射度
	Gloss	光泽度
	Alpha	透明度

 常用CG函数

UnpackNormal	fixed4输入 返回fixed3 返回对应的法线
saturate	限制值函数 限制0-1
dot	点乘
tex2D	通过uv查找贴图纹理的当前顶点颜色值

案例（SubShader中不用写Pass通道）

        surface Color

固定颜色	struct Input {float4 color:COLOR}; o.Albedo = float3(0.5,0.8,0.3);
可调颜色	struct Input {float4 color:COLOR}; 与properties同名——float4_Color; o.Albedo = _Color.rgb;
	o.Alpha = _Color.a;	前提：#pragma surface surf Lambert alpha

         surface Texture

与properties同名——sampler2D _MainTex;

定义图片的uv坐标——struct Input {float2 uv_MainTex};

o.Albedo = tex2D(_MainTex,IN.uv_MainTex).rgb;

         suface Normal

struct Input {float2 uv_MainTex;}; struct Input {float2 uv_BumpMap;};

sampler2D _MainTex; sampler2D _BumpMap;

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

         suface Texture + Color + Normal

struct Input {float2 uv_MainTex;}; struct Input {float2 uv_BumpMap;}; struct Input {fixed4 _MainColor;};

sampler2D _MainTex; sampler2D _BumpMap; fixed4 _MainColor;

o.Albedo = tex2D(_MainTex,uv_MainTex).rgb; o.Albedo += _MainColor.rgb; o.Normal = UnpackNormal (tex2D(_BumpMap,IN.uv_BumpMap));

        suface Texture + Color + Normal + RimEmission 

struct Input {half3 viewDir;};

half rim = 1-saturate(dot(normalize(IN.viewDir),o.Normal));

o.Emission = _RimColor.rgb * pow(rim,_RimPower); ----------------------------------------------------------------------- o.Emission = _RimColor.rgb * rim * _RimPower