Surface Shader Surface shaders

describe

When your Material We have to deal with the light , It is generally used Surface Shader.Surface Shader Hiding the calculation of light , You just need to surf Set the reflectivity in the function 、 Normal vector equivalence is fine . These values are sent to Lighting model Calculation in , And then it's going to output every pixel RGB value . actually ,SurfaceShader It will eventually be compiled into VertexShader and FragmentShader, So write SurfaceShader It can save us a lot of work .

Operation mode


3D The model is fed into the surface shader , The first is to process the vertices through the vertex adjuster , And then send the results to the surface function for processing , Then send the results to the lighting model , The final output is the color of all pixels .


analysis

establish Surface Shader

Template code

Shader "Custom/SurfaceShader" {
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
}
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;
void surf (Input IN, inout SurfaceOutputStandard o) {
// Albedo comes from a texture tinted by color
fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
o.Albedo = c.rgb;
// Metallic and smoothness come from slider variables
o.Metallic = _Metallic;
o.Smoothness = _Glossiness;
o.Alpha = c.a;
}
ENDCG
}
FallBack "Diffuse"
}

The code analysis

Properties analysis

  1. _Color: The primary color of an object
  2. _MainTex: The texture on the object
  3. _Glossiness: Glossiness , Control the specular power of highlights
  4. _Metallic: Metallicity

Tags

Mainly used to control rendering options , Like the order of rendering (Rendering order) And render type (Rendering Type) etc. .
Specific options can be found in Official documents , Light ink blog

LOD

LOD yes Level of Detail Abbreviation , Represents the level of detail effect , Mainly by controlling the display effect of details to achieve optimization , Only LOD Less than QualitySettings Of Maximum LOD Level Of Shader Will be used in the bag .
Specifically LOD The definition can refer to WIKI,LOD The value can refer to Unity Canon

CG Program

  1. CGPROGRAM and ENDCG What's in between is CG Program .
  2. Precompiled translation head :#pragma surface surf Standard fullforwardshadows
    surface That means this is one Surface Shader,surf Represents the name of the surface function ,Standard Said the use of Standard The illumination model of light source ,fullforwardshadows It's the shadow type
  3. Precompiled translation head :#pragma target 3.0
    Shader model Version of , For better lighting
  4. The rest is how to operate surf function
    It's just a simple assignment , So what's confusing is CG The grammar ,CG You can refer to The Cg Tutorial

Reference resources

  1. Official documents
  2. Light ink blog
  3. Cats can learn Unity3D Shader Getting started
  4. A gentle introduction to shaders in Unity3D
  5. The Cg Tutorial

Surface Shader More about simple wizard

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