HDDA Voxel Tracing

Sparse Volume Texture and GVDB structure

Lightmass

支持 `Mac` 和 `Windows`

* UE4Editor

* Export scene, static meshes, lights to file

* Start **Swarm**, prepare job depend files

* OpenChannel, start job

* SwarmAgent

* Launch UnrealLightmass

* UnrealLightmass

* Finish

* UE4Editor import build data

* DotNet实现

* SwarmCommonUtils

* SwarmCoodinatorInterface

* SwarmInterface

原理见[Lightmass的算法解析](light_mass_photon_mapping.md)

CUDA加速部分

ISPC AVX512加速部分

Lightmass算法解析

Occlusion Data生成路径

**LODForOccluderMesh >= 0**

该方法 UStaticMesh::PostLoad() 和 UStaticMesh::BatchBuild() <- UStaticMesh::Build() <- PostEditChangeProperty/GenerateLodsInPackageRemoveVertexColors

CookingTarget() Windows下是**TGenericWindowsTargetPlatform**而不是其他（比如FAllDesktopPlatform）

Writer_ControlRecv <- Writer_UpdateControl <- Writer_WorkerUpdateInternal <- Writer_WorkerUpdate <- Writer_WorkerThread

<- Writer_WorkerJoin

<- Writer_Update <- UE::Trace::Update() [When worker thread is not launched.] <- FCoreDelegates::OnEndFrame.AddStatic(UE::Trace::Update);

<- MemoryTrace_UpdateInternal()

一个是WorkerThread，一个是WorkerThread没启动的时候去调用

初始化

Writer_InitializeControl()

Writer_ControlAddCommand("ConsoleCommand", nullptr,

[] (void*, uint32 ArgC, ANSICHAR const* const* ArgV)

{

if (ArgC < 2)

{

return;

}

const size_t BufferSize = 512;

ANSICHAR Channels[BufferSize] = {};

ANSICHAR* Ctx;

const bool bState = (ArgV[1][0] != '0');

FCStringAnsi::Strcpy(Channels, BufferSize, ArgV[0]);

ANSICHAR* Channel = FCStringAnsi::Strtok(Channels, ",", &Ctx);

while (Channel)

{

FChannel::Toggle(Channel, bState);

Channel = FCStringAnsi::Strtok(nullptr, ",", &Ctx);

}

}

);