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LOD设置

LOD全称Level of Detail

作用：unity引擎会根据不同的LOD值在不同的平台上使用不同的SubShader 注意：在上几篇博客中已经说过在一个着色器中会有一到多个SubShader，但是系统每次只会执行一个子着色器，选择子着色器的标准就是根据子着色器所设置的LOD的值来进行选择，每一次使用着色器，都会选择第一个小于等于LOD值的子着色器。

如何设置Shader的LOD的值

：通过Shader maximumlOOD来设置最大的LOD值即Shader.globalMaximumLOD;

unity内置着色器分LOD等级

注意在设置最大LOD值的时候不能小于 Ver texLit kind of shaders 的值（100），否则unity将不会显示使用此着色器的物体 Demo： 场景 shader代码

Shader "Custom/LODShader"{
       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    }//每一次只会使用一个SubShader（根据LOD的值来使用）//找到第一个<=Shader.maximumLOD这个subShader执行；如果所有的均不符合，则最后使用fallback    SubShader    {
           Tags {
    "RenderType"="Opaque" }        LOD 600        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;        // Add instancing support for this shader. You need to check 'Enable Instancing' on materials that use the shader.        // See https://docs.unity3d.com/Manual/GPUInstancing.html for more information about instancing.        // #pragma instancing_options assumeuniformscaling        UNITY_INSTANCING_BUFFER_START(Props)            // put more per-instance properties here        UNITY_INSTANCING_BUFFER_END(Props)        void surf (Input IN, inout SurfaceOutputStandard o)        {
              o.Albedo = fixed4(1.0,0.0,0.0,1.0);                    }        ENDCG    }			SubShader		{
   			Tags {
    "RenderType" = "Opaque" }			LOD 500			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;			// Add instancing support for this shader. You need to check 'Enable Instancing' on materials that use the shader.			// See https://docs.unity3d.com/Manual/GPUInstancing.html for more information about instancing.			// #pragma instancing_options assumeuniformscaling			UNITY_INSTANCING_BUFFER_START(Props)				// put more per-instance properties here			UNITY_INSTANCING_BUFFER_END(Props)			void surf(Input IN, inout SurfaceOutputStandard o)			{
   			   o.Albedo = fixed4(0.0,1.0,0.0,1.0);			}			ENDCG		}			SubShader			{
   				Tags {
    "RenderType" = "Opaque" }				LOD 400				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;				// Add instancing support for this shader. You need to check 'Enable Instancing' on materials that use the shader.				// See https://docs.unity3d.com/Manual/GPUInstancing.html for more information about instancing.				// #pragma instancing_options assumeuniformscaling				UNITY_INSTANCING_BUFFER_START(Props)					// put more per-instance properties here				UNITY_INSTANCING_BUFFER_END(Props)				void surf(Input IN, inout SurfaceOutputStandard o)				{
   				   o.Albedo = fixed4(0.0,0.0,1.0,1.0);				}				ENDCG			}    FallBack "Diffuse"}

c#控制LOD值的代码

using System.Collections;using System.Collections.Generic;using UnityEngine;/// 
/// 根据不同的平台选择不同的SubShader /// 
public class My_Scripts : MonoBehaviour{
       public Shader shader;    public int LOD_Value = 600;    //这个值最小为100，如果小于100将什么都不显示（系统内置的shaderLOD值最小为100，如果小于100将什么都不显示）    // Start is called before the first frame update    void Start()    {
           Debug.Log(this.shader.maximumLOD);        //this.shader.maximumLOD = this.LOD_Value;    }    // Update is called once per frame    void Update()    {
           //当前这个shader最大的LOD值        this.shader.maximumLOD = this.LOD_Value;    }}

显示效果

渲染队列

渲染队列

Unity引擎会将需要渲染的物体分成几个渲染的队列 Unity默认有几个渲染队列 背景1000、Geometry（几何队列）2000、Alpha Test Alpha测试（2450）、Transparent（透明）对应值为3000、Overlay（覆盖）对应值为4000这个队列是最后的渲染队列 从数值小的开始一直到数值最大（需要注意是否透明） Unity渲染模式：普通物体从前向后渲染Alpha从后向前绘制 Demo： 场景： 将红球放置在篮球的后面 摄像机观测场景如下 红球shader代码

Shader "Custom/Render_text"{
       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" "Queue" = "Geometry" }			LOD 200			ZTest off//关闭深度测试        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;        // Add instancing support for this shader. You need to check 'Enable Instancing' on materials that use the shader.        // See https://docs.unity3d.com/Manual/GPUInstancing.html for more information about instancing.        // #pragma instancing_options assumeuniformscaling        UNITY_INSTANCING_BUFFER_START(Props)            // put more per-instance properties here        UNITY_INSTANCING_BUFFER_END(Props)        void surf (Input IN, inout SurfaceOutputStandard o)        {
               o.Albedo = _Color.rgb;                }        ENDCG    }    FallBack "Diffuse"}

注意如果要修改某着色器的渲染队列并且令其起作用的话，需要将深度测试关闭

修改后的场景

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