UE4c++ ConvertActorsToStaticMesh

UE4c++ ConvertActorsToStaticMesh

目标:为了大量生成模型，我们把虚幻带有的方法迁移成函数，并去掉默认弹窗，以便代码调用

测试调用：

演示效果：

创建Edior模块（最好是放Editor模块毕竟是编辑器代码）

创建UBlueprintFunctionLibrary

UTestFunctionLibrary.h

// Fill out your copyright notice in the Description page of Project Settings.#pragma once#include "CoreMinimal.h"
#include "RawMesh.h"
#include "Kismet/BlueprintFunctionLibrary.h"
#include "TestFunctionLibrary.generated.h"struct FRawMeshTracker_Copy
{FRawMeshTracker_Copy(): bValidColors(false){FMemory::Memset(bValidTexCoords, 0);}bool bValidTexCoords[MAX_MESH_TEXTURE_COORDS];bool bValidColors;
};UCLASS()
class TESTEDITOR_API UTestFunctionLibrary : public UBlueprintFunctionLibrary
{GENERATED_BODY()public:UFUNCTION(BlueprintCallable)static void ConvertActorMeshesToStaticMesh(const TArray<AActor*> InActors,const FString& PathString = FString(TEXT("/Game/Meshes/")),const FString& InMeshName = FString(TEXT("StaticMesh")));static void GetSkinnedAndStaticMeshComponentsFromActors(const TArray<AActor*> InActors,TArray<UMeshComponent*>& OutMeshComponents);static bool IsValidSkinnedMeshComponent(USkinnedMeshComponent* InComponent);static bool IsValidStaticMeshComponent(UStaticMeshComponent* InComponent);template <typename ComponentType>static void ProcessMaterials(ComponentType* InComponent, const FString& InPackageName,TArray<UMaterialInterface*>& OutMaterials){const int32 NumMaterials = InComponent->GetNumMaterials();for (int32 MaterialIndex = 0; MaterialIndex < NumMaterials; MaterialIndex++){UMaterialInterface* MaterialInterface = InComponent->GetMaterial(MaterialIndex);AddOrDuplicateMaterial(MaterialInterface, InPackageName, OutMaterials);}}static void AddOrDuplicateMaterial(UMaterialInterface* InMaterialInterface, const FString& InPackageName,TArray<UMaterialInterface*>& OutMaterials);static void SkinnedMeshToRawMeshes(USkinnedMeshComponent* InSkinnedMeshComponent, int32 InOverallMaxLODs,const FMatrix& InComponentToWorld, const FString& InPackageName,TArray<FRawMeshTracker_Copy>& OutRawMeshTrackers, TArray<FRawMesh>& OutRawMeshes,TArray<UMaterialInterface*>& OutMaterials);// Helper function for ConvertMeshesToStaticMeshstatic void StaticMeshToRawMeshes(UStaticMeshComponent* InStaticMeshComponent, int32 InOverallMaxLODs,const FMatrix& InComponentToWorld, const FString& InPackageName,TArray<FRawMeshTracker_Copy>& OutRawMeshTrackers, TArray<FRawMesh>& OutRawMeshes,TArray<UMaterialInterface*>& OutMaterials);static UStaticMesh* ConvertMeshesToStaticMesh(const TArray<UMeshComponent*>& InMeshComponents,const FTransform& InRootTransform,const FString& PathString = FString(TEXT("/Game/Meshes/")),const FString& InMeshName = FString(TEXT("StaticMesh")),const FString& InPackageName = FString());};

UTestFunctionLibrary.cpp:

// Fill out your copyright notice in the Description page of Project Settings.#include "TestFunctionLibrary.h"
#include "Materials/MaterialInstanceDynamic.h"
#include "AssetToolsModule.h"
#include "ContentBrowserModule.h"
#include "Editor.h"
#include "IContentBrowserSingleton.h"
#include "MeshUtilities.h"
#include "SkeletalRenderPublic.h"
#include "AssetRegistry/AssetRegistryModule.h"
#include "Components/CapsuleComponent.h"
#include "Framework/Notifications/NotificationManager.h"
#include "GameFramework/Character.h"
#include "Rendering/SkeletalMeshRenderData.h"
#include "Subsystems/AssetEditorSubsystem.h"
#include "Widgets/Notifications/SNotificationList.h"#define LOCTEXT_NAMESPACE "UTestFunctionLibrary"void UTestFunctionLibrary::ConvertActorMeshesToStaticMesh(const TArray<AActor*> InActors,const FString& PathString, const FString& InMeshName)
{IMeshUtilities& MeshUtilities = FModuleManager::Get().LoadModuleChecked<IMeshUtilities>("MeshUtilities");TArray<UMeshComponent*> MeshComponents;GetSkinnedAndStaticMeshComponentsFromActors(InActors, MeshComponents);auto GetActorRootTransform = [](AActor* InActor){FTransform RootTransform(FTransform::Identity);if (const ACharacter* Character = Cast<ACharacter>(InActor)){RootTransform = Character->GetTransform();RootTransform.SetLocation(RootTransform.GetLocation() - FVector(0.0f, 0.0f, Character->GetCapsuleComponent()->GetScaledCapsuleHalfHeight()));}else{// otherwise just use the actor's originRootTransform = InActor->GetTransform();}return RootTransform;};// now pick a root transformFTransform RootTransform(FTransform::Identity);if (InActors.Num() == 1){RootTransform = GetActorRootTransform(InActors[0]);}else{// multiple actors use the average of their origins, with Z being the min of all origins. Rotation is identity for simplicityFVector Location(FVector::ZeroVector);float MinZ = FLT_MAX;for (AActor* Actor : InActors){FTransform ActorTransform(GetActorRootTransform(Actor));Location += ActorTransform.GetLocation();MinZ = FMath::Min(ActorTransform.GetLocation().Z, MinZ);}Location /= (float)InActors.Num();Location.Z = MinZ;RootTransform.SetLocation(Location);}UStaticMesh* StaticMesh = ConvertMeshesToStaticMesh(MeshComponents, RootTransform, PathString, InMeshName);// Also notify the content browser that the new assets existsif (StaticMesh != nullptr){FContentBrowserModule& ContentBrowserModule = FModuleManager::Get().LoadModuleChecked<FContentBrowserModule>("ContentBrowser");ContentBrowserModule.Get().SyncBrowserToAssets(TArray<UObject*>({StaticMesh}), true);}
}void UTestFunctionLibrary::GetSkinnedAndStaticMeshComponentsFromActors(const TArray<AActor*> InActors,TArray<UMeshComponent*>& OutMeshComponents)
{for (AActor* Actor : InActors){// add all components from this actorTInlineComponentArray<UMeshComponent*> ActorComponents(Actor);for (UMeshComponent* ActorComponent : ActorComponents){if (ActorComponent->IsA(USkinnedMeshComponent::StaticClass()) || ActorComponent->IsA(UStaticMeshComponent::StaticClass())){OutMeshComponents.AddUnique(ActorComponent);}}// add all attached actorsTArray<AActor*> AttachedActors;Actor->GetAttachedActors(AttachedActors);for (AActor* AttachedActor : AttachedActors){TInlineComponentArray<UMeshComponent*> AttachedActorComponents(AttachedActor);for (UMeshComponent* AttachedActorComponent : AttachedActorComponents){if (AttachedActorComponent->IsA(USkinnedMeshComponent::StaticClass()) || AttachedActorComponent->IsA(UStaticMeshComponent::StaticClass())){OutMeshComponents.AddUnique(AttachedActorComponent);}}}}
}bool UTestFunctionLibrary::IsValidSkinnedMeshComponent(USkinnedMeshComponent* InComponent)
{return InComponent && InComponent->MeshObject && InComponent->IsVisible();
}bool UTestFunctionLibrary::IsValidStaticMeshComponent(UStaticMeshComponent* InComponent)
{return InComponent && InComponent->GetStaticMesh() && InComponent->GetStaticMesh()->GetRenderData() &&InComponent->IsVisible();
}void UTestFunctionLibrary::AddOrDuplicateMaterial(UMaterialInterface* InMaterialInterface,const FString& InPackageName, TArray<UMaterialInterface*>& OutMaterials)
{if (InMaterialInterface && !InMaterialInterface->GetOuter()->IsA<UPackage>()){// Convert runtime material instances to new concrete material instances// Create new packageFString OriginalMaterialName = InMaterialInterface->GetName();FString MaterialPath = FPackageName::GetLongPackagePath(InPackageName) / OriginalMaterialName;FString MaterialName;FAssetToolsModule& AssetToolsModule = FModuleManager::LoadModuleChecked<FAssetToolsModule>("AssetTools");AssetToolsModule.Get().CreateUniqueAssetName(MaterialPath, TEXT(""), MaterialPath, MaterialName);UPackage* MaterialPackage = CreatePackage(*MaterialPath);// Duplicate the object into the new packageUMaterialInterface* NewMaterialInterface = DuplicateObject<UMaterialInterface>(InMaterialInterface, MaterialPackage, *MaterialName);NewMaterialInterface->SetFlags(RF_Public | RF_Standalone);if (UMaterialInstanceDynamic* MaterialInstanceDynamic = Cast<UMaterialInstanceDynamic>(NewMaterialInterface)){UMaterialInstanceDynamic* OldMaterialInstanceDynamic = CastChecked<UMaterialInstanceDynamic>(InMaterialInterface);MaterialInstanceDynamic->K2_CopyMaterialInstanceParameters(OldMaterialInstanceDynamic);}NewMaterialInterface->MarkPackageDirty();FAssetRegistryModule::AssetCreated(NewMaterialInterface);InMaterialInterface = NewMaterialInterface;}OutMaterials.Add(InMaterialInterface);
}void UTestFunctionLibrary::SkinnedMeshToRawMeshes(USkinnedMeshComponent* InSkinnedMeshComponent,int32 InOverallMaxLODs, const FMatrix& InComponentToWorld, const FString& InPackageName,TArray<FRawMeshTracker_Copy>& OutRawMeshTrackers, TArray<FRawMesh>& OutRawMeshes,TArray<UMaterialInterface*>& OutMaterials){const int32 BaseMaterialIndex = OutMaterials.Num();// Export all LODs to raw meshesconst int32 NumLODs = InSkinnedMeshComponent->GetNumLODs();for (int32 OverallLODIndex = 0; OverallLODIndex < InOverallMaxLODs; OverallLODIndex++){int32 LODIndexRead = FMath::Min(OverallLODIndex, NumLODs - 1);FRawMesh& RawMesh = OutRawMeshes[OverallLODIndex];FRawMeshTracker_Copy& RawMeshTracker = OutRawMeshTrackers[OverallLODIndex];const int32 BaseVertexIndex = RawMesh.VertexPositions.Num();FSkeletalMeshLODInfo& SrcLODInfo = *(InSkinnedMeshComponent->SkeletalMesh->GetLODInfo(LODIndexRead));// Get the CPU skinned verts for this LODTArray<FFinalSkinVertex> FinalVertices;InSkinnedMeshComponent->GetCPUSkinnedVertices(FinalVertices, LODIndexRead);FSkeletalMeshRenderData& SkeletalMeshRenderData = InSkinnedMeshComponent->MeshObject->GetSkeletalMeshRenderData();FSkeletalMeshLODRenderData& LODData = SkeletalMeshRenderData.LODRenderData[LODIndexRead];// Copy skinned vertex positionsfor (int32 VertIndex = 0; VertIndex < FinalVertices.Num(); ++VertIndex){RawMesh.VertexPositions.Add(InComponentToWorld.TransformPosition(FinalVertices[VertIndex].Position));}const uint32 NumTexCoords = FMath::Min(LODData.StaticVertexBuffers.StaticMeshVertexBuffer.GetNumTexCoords(),(uint32)MAX_MESH_TEXTURE_COORDS);const int32 NumSections = LODData.RenderSections.Num();FRawStaticIndexBuffer16or32Interface& IndexBuffer = *LODData.MultiSizeIndexContainer.GetIndexBuffer();for (int32 SectionIndex = 0; SectionIndex < NumSections; SectionIndex++){const FSkelMeshRenderSection& SkelMeshSection = LODData.RenderSections[SectionIndex];if (InSkinnedMeshComponent->IsMaterialSectionShown(SkelMeshSection.MaterialIndex, LODIndexRead)){// Build 'wedge' infoconst int32 NumWedges = SkelMeshSection.NumTriangles * 3;for (int32 WedgeIndex = 0; WedgeIndex < NumWedges; WedgeIndex++){const int32 VertexIndexForWedge = IndexBuffer.Get(SkelMeshSection.BaseIndex + WedgeIndex);RawMesh.WedgeIndices.Add(BaseVertexIndex + VertexIndexForWedge);const FFinalSkinVertex& SkinnedVertex = FinalVertices[VertexIndexForWedge];const FVector TangentX = InComponentToWorld.TransformVector(SkinnedVertex.TangentX.ToFVector());const FVector TangentZ = InComponentToWorld.TransformVector(SkinnedVertex.TangentZ.ToFVector());const FVector4 UnpackedTangentZ = SkinnedVertex.TangentZ.ToFVector4();const FVector TangentY = (TangentZ ^ TangentX).GetSafeNormal() * UnpackedTangentZ.W;RawMesh.WedgeTangentX.Add(TangentX);RawMesh.WedgeTangentY.Add(TangentY);RawMesh.WedgeTangentZ.Add(TangentZ);for (uint32 TexCoordIndex = 0; TexCoordIndex < MAX_MESH_TEXTURE_COORDS; TexCoordIndex++){if (TexCoordIndex >= NumTexCoords){RawMesh.WedgeTexCoords[TexCoordIndex].AddDefaulted();}else{RawMesh.WedgeTexCoords[TexCoordIndex].Add(LODData.StaticVertexBuffers.StaticMeshVertexBuffer.GetVertexUV(VertexIndexForWedge, TexCoordIndex));RawMeshTracker.bValidTexCoords[TexCoordIndex] = true;}}if (LODData.StaticVertexBuffers.ColorVertexBuffer.IsInitialized()){RawMesh.WedgeColors.Add(LODData.StaticVertexBuffers.ColorVertexBuffer.VertexColor(VertexIndexForWedge));RawMeshTracker.bValidColors = true;}else{RawMesh.WedgeColors.Add(FColor::White);}}int32 MaterialIndex = SkelMeshSection.MaterialIndex;// use the remapping of material indices if there is a valid valueif (SrcLODInfo.LODMaterialMap.IsValidIndex(SectionIndex) && SrcLODInfo.LODMaterialMap[SectionIndex]!= INDEX_NONE){MaterialIndex = FMath::Clamp<int32>(SrcLODInfo.LODMaterialMap[SectionIndex], 0,InSkinnedMeshComponent->SkeletalMesh->GetMaterials().Num());}// copy face infofor (uint32 TriIndex = 0; TriIndex < SkelMeshSection.NumTriangles; TriIndex++){RawMesh.FaceMaterialIndices.Add(BaseMaterialIndex + MaterialIndex);RawMesh.FaceSmoothingMasks.Add(0); // Assume this is ignored as bRecomputeNormals is false}}}}ProcessMaterials<USkinnedMeshComponent>(InSkinnedMeshComponent, InPackageName, OutMaterials);}void UTestFunctionLibrary::StaticMeshToRawMeshes(UStaticMeshComponent* InStaticMeshComponent,int32 InOverallMaxLODs, const FMatrix& InComponentToWorld, const FString& InPackageName,TArray<FRawMeshTracker_Copy>& OutRawMeshTrackers, TArray<FRawMesh>& OutRawMeshes,TArray<UMaterialInterface*>& OutMaterials){const int32 BaseMaterialIndex = OutMaterials.Num();const int32 NumLODs = InStaticMeshComponent->GetStaticMesh()->GetRenderData()->LODResources.Num();for (int32 OverallLODIndex = 0; OverallLODIndex < InOverallMaxLODs; OverallLODIndex++){int32 LODIndexRead = FMath::Min(OverallLODIndex, NumLODs - 1);FRawMesh& RawMesh = OutRawMeshes[OverallLODIndex];FRawMeshTracker_Copy& RawMeshTracker = OutRawMeshTrackers[OverallLODIndex];const FStaticMeshLODResources& LODResource = InStaticMeshComponent->GetStaticMesh()->GetRenderData()->LODResources[LODIndexRead];const int32 BaseVertexIndex = RawMesh.VertexPositions.Num();for (int32 VertIndex = 0; VertIndex < LODResource.GetNumVertices(); ++VertIndex){RawMesh.VertexPositions.Add(InComponentToWorld.TransformPosition(LODResource.VertexBuffers.PositionVertexBuffer.VertexPosition((uint32)VertIndex)));}const FIndexArrayView IndexArrayView = LODResource.IndexBuffer.GetArrayView();const FStaticMeshVertexBuffer& StaticMeshVertexBuffer = LODResource.VertexBuffers.StaticMeshVertexBuffer;const int32 NumTexCoords = FMath::Min(StaticMeshVertexBuffer.GetNumTexCoords(),(uint32)MAX_MESH_TEXTURE_COORDS);const int32 NumSections = LODResource.Sections.Num();for (int32 SectionIndex = 0; SectionIndex < NumSections; SectionIndex++){const FStaticMeshSection& StaticMeshSection = LODResource.Sections[SectionIndex];const int32 NumIndices = StaticMeshSection.NumTriangles * 3;for (int32 IndexIndex = 0; IndexIndex < NumIndices; IndexIndex++){int32 Index = IndexArrayView[StaticMeshSection.FirstIndex + IndexIndex];RawMesh.WedgeIndices.Add(BaseVertexIndex + Index);RawMesh.WedgeTangentX.Add(InComponentToWorld.TransformVector(StaticMeshVertexBuffer.VertexTangentX(Index)));RawMesh.WedgeTangentY.Add(InComponentToWorld.TransformVector(StaticMeshVertexBuffer.VertexTangentY(Index)));RawMesh.WedgeTangentZ.Add(InComponentToWorld.TransformVector(StaticMeshVertexBuffer.VertexTangentZ(Index)));for (int32 TexCoordIndex = 0; TexCoordIndex < MAX_MESH_TEXTURE_COORDS; TexCoordIndex++){if (TexCoordIndex >= NumTexCoords){RawMesh.WedgeTexCoords[TexCoordIndex].AddDefaulted();}else{RawMesh.WedgeTexCoords[TexCoordIndex].Add(StaticMeshVertexBuffer.GetVertexUV(Index, TexCoordIndex));RawMeshTracker.bValidTexCoords[TexCoordIndex] = true;}}if (LODResource.VertexBuffers.ColorVertexBuffer.IsInitialized()){RawMesh.WedgeColors.Add(LODResource.VertexBuffers.ColorVertexBuffer.VertexColor(Index));RawMeshTracker.bValidColors = true;}else{RawMesh.WedgeColors.Add(FColor::White);}}// copy face infofor (uint32 TriIndex = 0; TriIndex < StaticMeshSection.NumTriangles; TriIndex++){RawMesh.FaceMaterialIndices.Add(BaseMaterialIndex + StaticMeshSection.MaterialIndex);RawMesh.FaceSmoothingMasks.Add(0); // Assume this is ignored as bRecomputeNormals is false}}}ProcessMaterials<UStaticMeshComponent>(InStaticMeshComponent, InPackageName, OutMaterials);}UStaticMesh* UTestFunctionLibrary::ConvertMeshesToStaticMesh(const TArray<UMeshComponent*>& InMeshComponents,const FTransform& InRootTransform, const FString& PathString, const FString& InMeshName,const FString& InPackageName){UStaticMesh* StaticMesh = nullptr;IMeshUtilities& MeshUtilities = FModuleManager::Get().LoadModuleChecked<IMeshUtilities>("MeshUtilities");// Build a package name to useFString MeshName;FString PackageName;if (InPackageName.IsEmpty()){FString NewNameSuggestion = InMeshName;FString PackageNameSuggestion = PathString + NewNameSuggestion;FString Name;FAssetToolsModule& AssetToolsModule = FModuleManager::LoadModuleChecked<FAssetToolsModule>("AssetTools");AssetToolsModule.Get().CreateUniqueAssetName(PackageNameSuggestion, TEXT(""), PackageNameSuggestion, Name);// TSharedPtr<SDlgPickAssetPath> PickAssetPathWidget =// 	SNew(SDlgPickAssetPath)// .Title(LOCTEXT("ConvertToStaticMeshPickName", "Choose New StaticMesh Location"))// .DefaultAssetPath(FText::FromString(PackageNameSuggestion));//if (PickAssetPathWidget->ShowModal() == EAppReturnType::Ok){// Get the full name of where we want to create the mesh asset.PackageName = PackageNameSuggestion; //PickAssetPathWidget->GetFullAssetPath().ToString();MeshName = FPackageName::GetLongPackageAssetName(PackageName);// Check if the user inputed a valid asset name, if they did not, give it the generated default nameif (MeshName.IsEmpty()){// Use the defaults that were already generated.PackageName = PackageNameSuggestion;MeshName = *Name;}}}else{PackageName = InPackageName;MeshName = *FPackageName::GetLongPackageAssetName(PackageName);}if (!PackageName.IsEmpty() && !MeshName.IsEmpty()){TArray<FRawMesh> RawMeshes;TArray<UMaterialInterface*> Materials;TArray<FRawMeshTracker_Copy> RawMeshTrackers;FMatrix WorldToRoot = InRootTransform.ToMatrixWithScale().Inverse();// first do a pass to determine the max LOD level we will be combining meshes intoint32 OverallMaxLODs = 0;for (UMeshComponent* MeshComponent : InMeshComponents){USkinnedMeshComponent* SkinnedMeshComponent = Cast<USkinnedMeshComponent>(MeshComponent);UStaticMeshComponent* StaticMeshComponent = Cast<UStaticMeshComponent>(MeshComponent);if (IsValidSkinnedMeshComponent(SkinnedMeshComponent)){OverallMaxLODs = FMath::Max(SkinnedMeshComponent->MeshObject->GetSkeletalMeshRenderData().LODRenderData.Num(),OverallMaxLODs);}else if (IsValidStaticMeshComponent(StaticMeshComponent)){OverallMaxLODs = FMath::Max(StaticMeshComponent->GetStaticMesh()->GetRenderData()->LODResources.Num(), OverallMaxLODs);}}// Resize raw meshes to accommodate the number of LODs we will needRawMeshes.SetNum(OverallMaxLODs);RawMeshTrackers.SetNum(OverallMaxLODs);// Export all visible componentsfor (UMeshComponent* MeshComponent : InMeshComponents){FMatrix ComponentToWorld = MeshComponent->GetComponentTransform().ToMatrixWithScale() * WorldToRoot;USkinnedMeshComponent* SkinnedMeshComponent = Cast<USkinnedMeshComponent>(MeshComponent);UStaticMeshComponent* StaticMeshComponent = Cast<UStaticMeshComponent>(MeshComponent);if (IsValidSkinnedMeshComponent(SkinnedMeshComponent)){SkinnedMeshToRawMeshes(SkinnedMeshComponent, OverallMaxLODs, ComponentToWorld, PackageName,RawMeshTrackers, RawMeshes, Materials);}else if (IsValidStaticMeshComponent(StaticMeshComponent)){StaticMeshToRawMeshes(StaticMeshComponent, OverallMaxLODs, ComponentToWorld, PackageName,RawMeshTrackers, RawMeshes, Materials);}}uint32 MaxInUseTextureCoordinate = 0;// scrub invalid vert color & tex coord datacheck(RawMeshes.Num() == RawMeshTrackers.Num());for (int32 RawMeshIndex = 0; RawMeshIndex < RawMeshes.Num(); RawMeshIndex++){if (!RawMeshTrackers[RawMeshIndex].bValidColors){RawMeshes[RawMeshIndex].WedgeColors.Empty();}for (uint32 TexCoordIndex = 0; TexCoordIndex < MAX_MESH_TEXTURE_COORDS; TexCoordIndex++){if (!RawMeshTrackers[RawMeshIndex].bValidTexCoords[TexCoordIndex]){RawMeshes[RawMeshIndex].WedgeTexCoords[TexCoordIndex].Empty();}else{// Store first texture coordinate index not in useMaxInUseTextureCoordinate = FMath::Max(MaxInUseTextureCoordinate, TexCoordIndex);}}}// Check if we got some valid data.bool bValidData = false;for (FRawMesh& RawMesh : RawMeshes){if (RawMesh.IsValidOrFixable()){bValidData = true;break;}}if (bValidData){// Then find/create it.UPackage* Package = CreatePackage(*PackageName);check(Package);// Create StaticMesh objectStaticMesh = NewObject<UStaticMesh>(Package, *MeshName, RF_Public | RF_Standalone);StaticMesh->InitResources();StaticMesh->SetLightingGuid();// Determine which texture coordinate map should be used for storing/generating the lightmap UVsconst uint32 LightMapIndex = FMath::Min(MaxInUseTextureCoordinate + 1,(uint32)MAX_MESH_TEXTURE_COORDS - 1);// Add source to new StaticMeshfor (FRawMesh& RawMesh : RawMeshes){if (RawMesh.IsValidOrFixable()){FStaticMeshSourceModel& SrcModel = StaticMesh->AddSourceModel();SrcModel.BuildSettings.bRecomputeNormals = false;SrcModel.BuildSettings.bRecomputeTangents = false;SrcModel.BuildSettings.bRemoveDegenerates = true;SrcModel.BuildSettings.bUseHighPrecisionTangentBasis = false;SrcModel.BuildSettings.bUseFullPrecisionUVs = false;SrcModel.BuildSettings.bGenerateLightmapUVs = true;SrcModel.BuildSettings.SrcLightmapIndex = 0;SrcModel.BuildSettings.DstLightmapIndex = LightMapIndex;SrcModel.SaveRawMesh(RawMesh);}}// Copy materials to new mesh for (UMaterialInterface* Material : Materials){StaticMesh->GetStaticMaterials().Add(FStaticMaterial(Material));}//Set the Imported version before calling the buildStaticMesh->ImportVersion = EImportStaticMeshVersion::LastVersion;// Set light map coordinate index to match DstLightmapIndexStaticMesh->SetLightMapCoordinateIndex(LightMapIndex);// setup section info mapfor (int32 RawMeshLODIndex = 0; RawMeshLODIndex < RawMeshes.Num(); RawMeshLODIndex++){const FRawMesh& RawMesh = RawMeshes[RawMeshLODIndex];TArray<int32> UniqueMaterialIndices;for (int32 MaterialIndex : RawMesh.FaceMaterialIndices){UniqueMaterialIndices.AddUnique(MaterialIndex);}int32 SectionIndex = 0;for (int32 UniqueMaterialIndex : UniqueMaterialIndices){StaticMesh->GetSectionInfoMap().Set(RawMeshLODIndex, SectionIndex,FMeshSectionInfo(UniqueMaterialIndex));SectionIndex++;}}StaticMesh->GetOriginalSectionInfoMap().CopyFrom(StaticMesh->GetSectionInfoMap());// Build mesh from sourceStaticMesh->Build(false);StaticMesh->PostEditChange();StaticMesh->MarkPackageDirty();// Notify asset registry of new assetFAssetRegistryModule::AssetCreated(StaticMesh);// Display notification so users can quickly access the meshif (GIsEditor){FNotificationInfo Info(FText::Format(LOCTEXT("SkeletalMeshConverted", "Successfully Converted Mesh"),FText::FromString(StaticMesh->GetName())));Info.ExpireDuration = 8.0f;Info.bUseLargeFont = false;Info.Hyperlink = FSimpleDelegate::CreateLambda([=](){GEditor->GetEditorSubsystem<UAssetEditorSubsystem>()->OpenEditorForAssets(TArray<UObject*>({StaticMesh}));});Info.HyperlinkText = FText::Format(LOCTEXT("OpenNewAnimationHyperlink", "Open {0}"),FText::FromString(StaticMesh->GetName()));TSharedPtr<SNotificationItem> Notification = FSlateNotificationManager::Get().AddNotification(Info);if (Notification.IsValid()){Notification->SetCompletionState(SNotificationItem::CS_Success);}}}}return StaticMesh;}

.Build.cs

        PrivateDependencyModuleNames.AddRange(new string[]{"CoreUObject","Engine","Slate","SlateCore","MeshUtilities","RawMesh","Slate","SlateCore","UnrealEd"});

最终调用ConvertActorMeshesToStaticMesh方法即可