17032002（动态AO DOF）

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【目标】

摄像机相关的AO DOF

【思路】

1 方案1： 

• 想添加一个相机节点放入后期链中
  

2 方案2：

• 在Uber节点属性中添加是否镜头相关属性

4 整个后期数据流程：

5 主要的数据控制在ULocalPlayer中

6 Blend计算

 

8 后期需求：

10 高中低配置方案：

• UPostProcessChain 中添加高中的Effect列表
  
• 
• 在后期中编辑器连接不同首节点，下图概念图
•  
• 
  
   

11 相机相关后期方案：

• 在UberPostProcess节点添加最近参数PostProcessSettings结构
• 新建一个结构，包括Settings和Camera相关参数
• 在根据CameraPitch生成Setting后，再使用ULocalPlayer.OverridePostProcessSettings 去覆盖

12 问题：在平视角 但是需要远景时怎么办（如Matineee中）？

• 所以对话时，打开主角界面时，用的是一个配置PPSettings
• 退出时恢复
• 开启相机相关的，对话等优先级要比相机相关的优先级高

13 在ULocalPlayer 中有个后期链列表

• ULocalPlayer.PlayerPostProcessChains
  
• 更新这个列表后要Rebuild一次，将列表中所有后期链的Effect加到ULocalPlayer.PlayerPostProcess 中
  
• 后面统一处理

14 问题：对话 主角界面这种使用PPSettings还是后期链？

【步骤】

1 修改\ue3\Development\Src\Engine\Classes\UberPostProcessEffect.uc 添加

2 修改 添加开关、Max Min

3 包一个函UPostProcessChain* GetActivePostProccessChain()

在ULocalPlayer.UpdatePostProcessSettings 之前 调用他，为了获取最终后期链的相机相关开关

此时需要去遍历后期链的Effect，每个调用一个更新相机相关的函数

需要添加虚函数

4 \ue3\Development\Src\Engine\Classes\PostProcessEffect.uc

ue3\Development\Src\Engine\Classes\UberPostProcessEffect.uc中重载

5 UUberPostProcessEffect::GetPPSettingsForCamera

6 ULocalPlayer.UpdateNearCamPP 

ULocalPlayer.CalcSceneView 调用

• 只能修改UpdatePostProcessSettings函数了 添加参数
  
• 需要在函数中间去取PPsetinggs，中途再去用NearCamPPS去override
  

ULocalPlayer.UpdatePostProcessSettings 修改为

• 必须开启UesWorldSettings开关才能使用，
  
• 也就是说不能依赖这个开关去应用Settings
• 后面如果需要程序直接控制DOF之类的还需要应用一套Settings

 

 8 在PostProcess基类中添加Camera的属性，

新建一个结构体用于Camera的Settings，不需要那么多

PPSettings没有AO相关的配置参数，

节点上有

但是有绘制用结构体FAmbientOcclusionSettings 

 

9 添加\ue3\Development\Src\Engine\Classes\AmbientOcclusionEffect.uc添加结构体

struct native AOSettings

{

    var    bool            bOverride_LinearColor;

    var    bool            bOverride_OcclusionPower;

    var    bool            bOverride_OcclusionScale;

    var    bool            bOverride_OcclusionBias;

    var    bool            bOverride_MinOcclusion;

    var    bool            bOverride_OcclusionRadius;

    var    bool            bOverride_OcclusionQuality;

    var    bool            bOverride_OcclusionFadeoutMinDistance;

    var    bool            bOverride_OcclusionFadeoutMaxDistance;

    var    bool            bOverride_HaloDistanceThreshold;

    var    bool            bOverride_HaloDistanceScale;

    var    bool            bOverride_HaloOcclusion;

    var    bool            bOverride_EdgeDistanceThreshold;

    var    bool            bOverride_EdgeDistanceScale;

    var    bool            bOverride_FilterDistanceScale;

    var    bool            bOverride_HistoryOcclusionConvergenceTime;

    var    bool            bOverride_HistoryWeightConvergenceTime;

    var    bool            bOverride_bAngleBasedSSAO;

    //See AmbientOcclusionEffect.uc for descriptions

    var() LinearColor OcclusionColor<editcondition=bOverride_OcclusionColor>;

    var() float OcclusionPower<editcondition=bOverride_OcclusionPower>;

    var() float OcclusionScale<editcondition=OcclusionScale>;

    var() float OcclusionBias<editcondition=bOverride_OcclusionBias>;

    var() float MinOcclusion<editcondition=bOverride_MinOcclusion>;

    var() float OcclusionRadius<editcondition=bOverride_OcclusionRadius>;

    var() EAmbientOcclusionQuality OcclusionQuality<editcondition=bOverride_OcclusionQuality>;

    var() float OcclusionFadeoutMinDistance<editcondition=bOverride_OcclusionFadeoutMinDistance>;

    var() float OcclusionFadeoutMaxDistance<editcondition=bOverride_OcclusionFadeoutMaxDistance>;

    var() float HaloDistanceThreshold<editcondition=bOverride_HaloDistanceThreshold>;

    var() float HaloDistanceScale<editcondition=bOverride_HaloDistanceScale>;

    var() float HaloOcclusion<editcondition=bOverride_HaloOcclusion>;

    var() float EdgeDistanceThreshold<editcondition=bOverride_EdgeDistanceThreshold>;

    var() float EdgeDistanceScale<editcondition=bOverride_EdgeDistanceScale>;

    var() float FilterDistanceScale<editcondition=bOverride_FilterDistanceScale>;

    var() float HistoryOcclusionConvergenceTime<editcondition=bOverride_HistoryOcclusionConvergenceTime>;

    var() float HistoryWeightConvergenceTime<editcondition=bOverride_HistoryWeightConvergenceTime>;

    var() bool bAngleBasedSSAO<editcondition=bOverride_bAngleBasedSSAO>;

structcpptext

{

}

};

struct native NearCameraAOSettings

{

    var() AOSettings Settings;

    var() INT CameraPitchMin;

    var() INT CameraPitchMax;

    

structcpptext

{

    FNearCameraAOSettings():

    CameraPitchMin(64626),

    CameraPitchMax(58800)

    {

        appMemzero(&Settings, sizeof(FPostProcessSettings));

    }

}

};

...

var(Camera) bool bUseCamAOSettings;

var(Camera) NearCameraAOSettings CamAOSettings<editcondition=bUseCamAOSettings>;

 

10 DOF也需要添加

struct native DOFSetings

{

/** Determines if DOF_FalloffExponent variable will be overridden. */

var bool bOverride_DOF_FalloffExponent;

/** Determines if DOF_BlurKernelSize variable will be overridden. */

var bool bOverride_DOF_BlurKernelSize;

/** Determines if DOF_BlurBloomKernelSize variable will be overridden. */

var bool bOverride_DOF_BlurBloomKernelSize;

/** Determines if DOF_MaxNearBlurAmount variable will be overridden. */

var bool bOverride_DOF_MaxNearBlurAmount;

/** Determines if DOF_MinBlurAmount variable will be overridden. */

var bool bOverride_DOF_MinBlurAmount;

/** Determines if DOF_MaxFarBlurAmount variable will be overridden. */

var bool bOverride_DOF_MaxFarBlurAmount;

/** Determines if DOF_FocusType variable will be overridden. */

var bool bOverride_DOF_FocusType;

/** Determines if DOF_FocusInnerRadius variable will be overridden. */

var bool bOverride_DOF_FocusInnerRadius;

/** Determines if DOF_FocusDistance variable will be overridden. */

var bool bOverride_DOF_FocusDistance;

/** Determines if DOF_FocusPosition variable will be overridden. */

var bool bOverride_DOF_FocusPosition;

/** Determines if DOF_InterpolationDuration variable will be overridden. */

var bool bOverride_DOF_InterpolationDuration;

/** Determines if DOF_BokehTexture variable will be overridden. */

var bool bOverride_DOF_BokehTexture;

/** Exponent to apply to blur amount after it has been normalized to [0,1]. */

var(DepthOfField) interp float DOF_FalloffExponent<editcondition=bOverride_DOF_FalloffExponent>;

/** affects the radius of the DepthOfField bohek / how blurry the scene gets */

var(DepthOfField) interp float DOF_BlurKernelSize<editcondition=bOverride_DOF_BlurKernelSize>;

/** [0,1] value for clamping how much blur to apply to items in front of the focus plane. */

var(DepthOfField, BlurAmount) interp float DOF_MaxNearBlurAmount<editcondition=bOverride_DOF_MaxNearBlurAmount | DisplayName=MaxNear>;

/** [0,1] value for clamping how much blur to apply. */

var(DepthOfField, BlurAmount) interp float DOF_MinBlurAmount<editcondition=bOverride_DOF_MinBlurAmount | DisplayName=Min>;

/** [0,1] value for clamping how much blur to apply to items behind the focus plane. */

var(DepthOfField, BlurAmount) interp float DOF_MaxFarBlurAmount<editcondition=bOverride_DOF_MaxFarBlurAmount | DisplayName=MaxFar>;

/** Controls how the focus point is determined. */

var(DepthOfField) EFocusType DOF_FocusType<editcondition=bOverride_DOF_FocusType>;

/** Inner focus radius. */

var(DepthOfField) interp float DOF_FocusInnerRadius<editcondition=bOverride_DOF_FocusInnerRadius>;

/** Used when FOCUS_Distance is enabled. */

var(DepthOfField) interp float DOF_FocusDistance<editcondition=bOverride_DOF_FocusDistance>;

/** Used when FOCUS_Position is enabled. */

var(DepthOfField) vector DOF_FocusPosition<editcondition=bOverride_DOF_FocusPosition>;

/** Duration over which to interpolate values to. */

var(DepthOfField) float DOF_InterpolationDuration<editcondition=bOverride_DOF_InterpolationDuration>;

/** Name of the Bokeh texture e.g. EngineMaterial.BokehTexture, empty if not used */

var(DepthOfField) Texture2D DOF_BokehTexture<editcondition=bOverride_DOF_BokehTexture>;

};

struct native NearCameraDOFSettings

{

var() DOFSetings Settings;

var() INT CameraPitchMin;

var() INT CameraPitchMax;

structcpptext

{

FNearCameraDOFSettings():

CameraPitchMin(64626),

CameraPitchMax(58800)

{

}

}

};

var(Camera) bool bUseCamDOFSettings;

var(Camera) NearCameraDOFSettings CamDOFSettings<editcondition=bUseCamDOFSettings>;

11 添加Settings的Override函数

struct native NearCameraAOSettings

{

...

    void OverrideSettings(const FCameraInfo& CI,FAOSettings& Settings);

structcpptext

{

    /**

        * Blends the settings on this structure marked as override setting onto the given settings

        *

        * @param    ToOverride    The settings that get overridden by the overridable settings on this structure. 

        * @param    Alpha        The opacity of these settings. If Alpha is 1, ToOverride will equal this setting structure.

        */

    void OverrideSettingsFor( FAOSettings& ToOverride, FLOAT Alpha=1.f ) const;

}

12 修改UPostProcessEffect.CreateSceneProxy 参数传入相机Info

FAmbientOcclusionSettings 添加相机Info

13 FDOFAndBloomPostProcessSceneProxy.FDOFAndBloomPostProcessSceneProxy 

需要新建一个DOF相关的Settings用于

\ue3\Development\Src\Engine\Classes\DOFEffect.uc

struct native DepthOfFieldSettings

{

    var float    FalloffExponent;

    var float    BlurKernelSize;

    var float    MaxNearBlurAmount;

    var float    MinBlurAmount;

    var float    MaxFarBlurAmount;

    var    EFocusType        FocusType;

    var float    FocusInnerRadius;

    var float    FocusDistance;

    var    vector    FocusPosition;

    var    float    InterpolationDuration;

};

将FDOFAndBloomPostProcessSceneProxy 类的一些DOF属性归类

    FDepthOfFieldSettings DOFProperty;

//    FLOAT FalloffExponent;

//    FLOAT BlurKernelSize;

    FLOAT BlurBloomKernelSize;

//    FLOAT MaxNearBlurAmount;

//    FLOAT MinBlurAmount;

//    FLOAT MaxFarBlurAmount;

//    BYTE FocusType;

//    FLOAT FocusInnerRadius;

//    FLOAT FocusDistance;

//    FVector FocusPosition;

FDOFAndBloomPostProcessSceneProxy.FDOFAndBloomPostProcessSceneProxy 构造

//     SET_POSTPROCESS_PROPERTY1(DOF, FalloffExponent);

        SET_POSTPROCESS_PROPERTY1(DOF, BlurKernelSize);

//     SET_POSTPROCESS_PROPERTY1(DOF, BlurBloomKernelSize);

//     SET_POSTPROCESS_PROPERTY1(DOF, MaxNearBlurAmount);

//     SET_POSTPROCESS_PROPERTY1(DOF, MinBlurAmount);

//     SET_POSTPROCESS_PROPERTY1(DOF, MaxFarBlurAmount);

//     SET_POSTPROCESS_PROPERTY1(DOF, FocusType);

//     SET_POSTPROCESS_PROPERTY1(DOF, FocusInnerRadius);

//     SET_POSTPROCESS_PROPERTY1(DOF, FocusDistance);

//     SET_POSTPROCESS_PROPERTY1(DOF, FocusPosition);

    SET_POSTPROCESS_PROPERTY1(DOF, BokehTexture);

    SET_POSTPROCESS_DOFPROPERTY(DOF, FalloffExponent);

    SET_POSTPROCESS_DOFPROPERTY(DOF, BlurKernelSize);

    SET_POSTPROCESS_DOFPROPERTY(DOF, BlurBloomKernelSize);

    SET_POSTPROCESS_DOFPROPERTY(DOF, MaxNearBlurAmount);

    SET_POSTPROCESS_DOFPROPERTY(DOF, MinBlurAmount);

    SET_POSTPROCESS_DOFPROPERTY(DOF, MaxFarBlurAmount);

    SET_POSTPROCESS_DOFPROPERTY(DOF, FocusType);

    SET_POSTPROCESS_DOFPROPERTY(DOF, FocusInnerRadius);

    SET_POSTPROCESS_DOFPROPERTY(DOF, FocusDistance);

    SET_POSTPROCESS_DOFPROPERTY(DOF, FocusPosition);

...

    // clamp DOF radius in reasonable bound 

    DOFProperty.BlurKernelSize = Clamp(DOFProperty.BlurKernelSize, 0.0f, 128.0f);

#define SET_POSTPROCESS_DOFPROPERTY(Group, Name) DOFProperty.Name = GET_POSTPROCESS_PROPERTY_X(Group, Name, Name);

FDOFSetings.OverrideSettingsFor 

#define LERP_DOFSETTINGS(Name) \

    if( bOverride_##Name ) \

{ \

    ToOverride.##Name = Lerp(ToOverride.##Name, ##Name, Alpha); \

}

void FDOFSetings::OverrideSettingsFor( FDepthOfFieldSettings& ToOverride, FLOAT Alpha=1.f) const

{

    // TOGGLE OVERRIDES

    if (Alpha <= 0.0f)

    {

        return;

    }

    LERP_DOFSETTINGS(FalloffExponent);

    LERP_DOFSETTINGS(BlurKernelSize);

    LERP_DOFSETTINGS(MaxNearBlurAmount);

    LERP_DOFSETTINGS(MinBlurAmount);

    LERP_DOFSETTINGS(MaxFarBlurAmount);

    LERP_DOFSETTINGS(FocusType);

    LERP_DOFSETTINGS(FocusInnerRadius);

    LERP_DOFSETTINGS(FocusDistance);

    LERP_DOFSETTINGS(FocusPosition);

    LERP_DOFSETTINGS(InterpolationDuration);

}

FNearCameraDOFSettings.OverrideSettings 

void FNearCameraDOFSettings::OverrideSettings(const FCameraInfo& CI,FDepthOfFieldSettings& ToOverride) const

{

    FLOAT DistanceAlpha = 1.f;

    FLOAT PitchAlpha = 1.f;

    UBOOL bOveriride = FALSE;

    if (CameraInfoMin.bEdit_CameraDistance && CameraInfoMax.bEdit_CameraDistance)

    {

        DistanceAlpha = (CameraInfoMax.CameraDistance - CI.CameraDistance) /

            (CameraInfoMax.CameraDistance - CameraInfoMin.CameraDistance);

        bOveriride = TRUE;

    }

    if (CameraInfoMin.bEdit_CameraPitch && CameraInfoMax.bEdit_CameraPitch)

    {

        PitchAlpha = (CameraInfoMax.CameraPitch - CI.CameraPitch) /

            (CameraInfoMax.CameraPitch - CameraInfoMin.CameraPitch);

        bOveriride = TRUE;

    }

    if (bOveriride)

    {

        FLOAT Alpha = Min(DistanceAlpha,PitchAlpha);

        Settings.OverrideSettingsFor(ToOverride,Alpha);

    }

}

FDOFAndBloomPostProcessSceneProxy.ComputeDOFParams 

        Params.FalloffExponent = DOFProperty.FalloffExponent;

        Params.MaxNearBlurAmount = DOFProperty.MaxNearBlurAmount;

        Params.MinBlurAmount = DOFProperty.MinBlurAmount;

        Params.MaxFarBlurAmount = DOFProperty.MaxFarBlurAmount;

FDOFAndBloomPostProcessSceneProxy.CalcDoFParams 

    switch( DOFProperty.FocusType )

    {

    case FOCUS_Position:

        {

            // world space focus point specified projected onto the view direction

            FocusPoint = (((DOFProperty.FocusPosition - View.ViewOrigin) | ViewDir) * ViewDir) + View.ViewOrigin;

        }        

        break;

    case FOCUS_Distance:

    default:

        {

            // focus point based on view distance

            FocusPoint = (DOFProperty.FocusDistance * ViewDir) + View.ViewOrigin;

        }        

        break;

    };

    // transform to projected/clip space in order to get w depth values

    OutFocusDistance = Max<FLOAT>(0.f, View.WorldToScreen(FocusPoint).W);

    // Add radius to get the far focus point

    FVector FocusPointFar = (ViewDir * DOFProperty.FocusInnerRadius) + FocusPoint;    

    FLOAT FocusDistanceFar = Max<FLOAT>(OutFocusDistance, View.WorldToScreen(FocusPointFar).W);

    OutFocusRadius = Max<FLOAT>((FLOAT)KINDA_SMALL_NUMBER, Abs<FLOAT>(FocusDistanceFar - OutFocusDistance));

FDOFAndBloomPostProcessSceneProxy.Render 

    GaussianBlurFilterBuffer(View, View.SizeX, DownsampledSizeX + AntiLeakBorder, DownsampledSizeY + AntiLeakBorder, DOFProperty.BlurKernelSize, 1.0f, SRTI_FilterColor0, SampleMaskMin, SampleMaskMax);

...

    BlendPixelShader->PostProcessParameters.SetPS(*BlendPixelShader, DOFProperty.BlurKernelSize, DOFOcclusionTweak);

修改FUberPostProcessSceneProxy 参数

14 FDOFAndBloomPostProcessSceneProxy.FDOFAndBloomPostProcessSceneProxy中最后去更新一下DOF镜头覆盖参数

    if (InEffect->bUseCamDOFSettings)

        InEffect->CamDOFSettings.OverrideSettings(CI,DOFProperty);

15 FViewInfo.FViewInfo. 传递CameraInfo

                    FCameraInfo CI;

                    CI.bEdit_CameraPitch = TRUE;

                    CI.CameraPitch = GCameraRotation.Pitch;

                    FPostProcessSceneProxy* PostProcessSceneProxy = Effect->CreateSceneProxy(

                        PostProcessSettings && Effect->bUseWorldSettings ? PostProcessSettings : NULL,CI

                        );

16 添加角度处理函数

inline INT ShortestRoute(INT Angle)

{

    Angle = Angle & 65535;

    if(Angle >= 32768)

        Angle -= 65536;

    return Angle;

}

17 FNearCameraAOSettings.OverrideSettings 改为

        INT Max = ShortestRoute(CameraInfoMax.CameraPitch);

        INT Min = ShortestRoute(CameraInfoMin.CameraPitch);

        INT Cur = ShortestRoute(CI.CameraPitch);

        PitchAlpha = (FLOAT)(Max -Cur) / (FLOAT)(Max - Min);

【小结】

• 上面只是节点上的相机参数融合
  
• 还有PPSettings还没有处理
  

运行

方案： 处理PPSettings

• 添加一个PostProcessSettings作为相机参数
• AWorldInfo.GetPostProcessSettings 中处理Override
  

18 \ue3\Development\Src\Engine\Classes\WorldInfo.uc

var(Camera) bool bUseCamDOFSettings;

var(Camera) NearCameraDOFSettings CamDOFSettings<editcondition=bUseCamDOFSettings>;

var(Camera) bool bUseCamAOSettings;

var(Camera) NearCameraAOSettings CamAOSettings<editcondition=bUseCamAOSettings>;

19 \Development\Src\Engine\Classes\DOFEffect.uc 添加Override支持PPSettings

20 AWorldInfo.GetPostProcessSettings 

        if (CurrentWorldInfo->bUseCamDOFSettings)

        {

            FCameraInfo CI(TRUE,FALSE,ViewRotation.Pitch,0.f);;

            CurrentWorldInfo->CamDOFSettings.OverrideSettings(CI,OutPostProcessSettings);

        }

        if (CurrentWorldInfo->bUseCamAOSettings)

        {

            FCameraInfo CI(TRUE,FALSE,ViewRotation.Pitch,0.f);;

            CurrentWorldInfo->CamAOSettings.OverrideSettings(CI,OutPostProcessSettings);

        }

这个修改TODO

 

 

18 

【运行】

 

3

17032002（动态AO DOF）

标签：weight   front   rar   编辑器   lam   oca   初始   9.png   中间   

原文地址：https://www.cnblogs.com/username/p/9223927.html