unity 优化之overdraw查看

scene视图里面能直接看，打开左上角那个下拉选项，选择overdraw就行

转载篇在game视图下查看overdraw:       https://blog.csdn.net/complicatedcc/article/details/70214681

c#代码，要挂在摄像机上

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

///

[RequireComponent(typeof(Camera))]

public class DebugOverdrawMode : MonoBehaviour {

public Shader m_OverdrawShader;

private Camera m_Camera;

private bool m_SceneFogSettings = false;

private CameraClearFlags m_ClearFlagSetting;

private Color m_BackGroundColor;

void Awake()

{

m_Camera = GetComponent();

StoreParam();

}

//void OnLevelWasLoaded()

//{

// //每次场景加载取消雾效，缓存并在OnDisable后恢复

// m_SceneFogSettings = RenderSettings.fog;

// RenderSettings.fog = false;

//}

void StoreParam()

{

m_SceneFogSettings = RenderSettings.fog;

RenderSettings.fog = false;

m_ClearFlagSetting = m_Camera.clearFlags;

m_BackGroundColor = m_Camera.backgroundColor;

}

void OnEnable()

{

if (m_OverdrawShader == null)

{

m_OverdrawShader = Shader.Find("Custom/Overdraw");

//m_OverdrawShader = UnityEditor.EditorGUIUtility.LoadRequired("SceneView/SceneViewShowOverdraw.shader") as Shader; //应用unity自带shader即可达到相同效果

}

if (m_OverdrawShader != null && m_Camera != null)

{

RenderSettings.fog = false;

m_Camera.clearFlags = CameraClearFlags.Color;

m_Camera.backgroundColor = Color.black;

m_Camera.SetReplacementShader(m_OverdrawShader, "");

bChanged = true;

}

}

void OnDisable()

{

if (m_Camera != null)

{

RestoreParam();

}

}

void RestoreParam()

{

RenderSettings.fog = m_SceneFogSettings;

//m_Camera.SetReplacementShader(null, ""); //和下面效果相同

m_Camera.ResetReplacementShader();

m_Camera.backgroundColor = m_BackGroundColor;

m_Camera.clearFlags = m_ClearFlagSetting;

}

//测试方法 为了方便切换 可在非运行模式下测试

bool bChanged;

bool bInited;

[ContextMenu("ChangeMode")]

public void ChangeMode()

{

if (bChanged)

{

RestoreParam();

}

else

{

if (!bInited)

{

m_Camera = GetComponent();

StoreParam();

m_OverdrawShader = Shader.Find("Custom/Overdraw");

bInited = true;

}

RenderSettings.fog = false;

m_Camera.clearFlags = CameraClearFlags.Color;

m_Camera.backgroundColor = Color.black;

m_Camera.SetReplacementShader(m_OverdrawShader, "");

}

bChanged = !bChanged;

}

}

　　shader代码

Shader "Custom/Overdraw"

{

SubShader

{

Tags { "RenderType" = "Transparent" "Queue" = "Transparent" }

LOD 100

Fog { Mode Off }

ZWrite Off

ZTest Always

Blend One One

Pass

{

CGPROGRAM

#pragma vertex vert

#pragma fragment frag

#include "UnityCG.cginc"

struct appdata

{

float4 vertex : POSITION;

};

struct v2f

{

float4 vertex : SV_POSITION;

};

v2f vert (appdata v)

{

v2f o;

o.vertex = UnityObjectToClipPos(v.vertex);

return o;

}

fixed4 frag (v2f i) : SV_Target

{

return fixed4(0.1, 0.04, 0.02, 0);

}

ENDCG

}

}

}

不过作者说这个不完全对，但是可以大概看下overdraw情况

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