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#rb none
#ROBOMERGE-OWNER: robert.manuszewski
#ROBOMERGE-AUTHOR: alexis.matte
#ROBOMERGE-SOURCE: CL 5351520 via CL 5351521 via CL 5354156 via CL 5354233
#ROBOMERGE-BOT: CORE (Main -> Dev-Core)
[CL 5408624 by alexis matte in Dev-Core branch]
631 lines
27 KiB
C++
631 lines
27 KiB
C++
// Copyright 1998-2019 Epic Games, Inc. All Rights Reserved.
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#include "StaticMeshBuilder.h"
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#include "Engine/StaticMesh.h"
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#include "StaticMeshResources.h"
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#include "PhysicsEngine/BodySetup.h"
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#include "MeshDescription.h"
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#include "MeshDescriptionOperations.h"
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#include "MeshAttributes.h"
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#include "MeshDescriptionHelper.h"
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#include "BuildOptimizationHelper.h"
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#include "Components.h"
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#include "IMeshReductionManagerModule.h"
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#include "MeshBuild.h"
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#include "Modules/ModuleManager.h"
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#include "IMeshReductionInterfaces.h"
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DEFINE_LOG_CATEGORY(LogStaticMeshBuilder);
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//////////////////////////////////////////////////////////////////////////
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//Local functions definition
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void BuildVertexBuffer(
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UStaticMesh *StaticMesh
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, int32 LodIndex
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, const FMeshDescription& MeshDescription
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, FStaticMeshLODResources& StaticMeshLOD
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, const FMeshBuildSettings& LODBuildSettings
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, TArray< uint32 >& IndexBuffer
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, TArray<int32>& OutWedgeMap
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, TArray<TArray<uint32> >& OutPerSectionIndices
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, TArray< FStaticMeshBuildVertex >& StaticMeshBuildVertices
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, const FOverlappingCorners& OverlappingCorners
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, float VertexComparisonThreshold
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, TArray<int32>& RemapVerts);
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void BuildAllBufferOptimizations(struct FStaticMeshLODResources& StaticMeshLOD, const struct FMeshBuildSettings& LODBuildSettings, TArray< uint32 >& IndexBuffer, bool bNeeds32BitIndices, TArray< FStaticMeshBuildVertex >& StaticMeshBuildVertices);
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//////////////////////////////////////////////////////////////////////////
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FStaticMeshBuilder::FStaticMeshBuilder()
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{
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}
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static bool UseNativeQuadraticReduction()
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{
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// Are we using our tool, or simplygon? The tool is only changed during editor restarts
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IMeshReduction* ReductionModule = FModuleManager::Get().LoadModuleChecked<IMeshReductionManagerModule>("MeshReductionInterface").GetStaticMeshReductionInterface();
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FString VersionString = ReductionModule->GetVersionString();
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TArray<FString> SplitVersionString;
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VersionString.ParseIntoArray(SplitVersionString, TEXT("_"), true);
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bool bUseQuadricSimplier = SplitVersionString[0].Equals("QuadricMeshReduction");
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return bUseQuadricSimplier;
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}
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bool FStaticMeshBuilder::Build(FStaticMeshRenderData& StaticMeshRenderData, UStaticMesh* StaticMesh, const FStaticMeshLODGroup& LODGroup)
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{
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// The tool can only been switch by restarting the editor
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static bool bIsThirdPartyReductiontool = !UseNativeQuadraticReduction();
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if (!StaticMesh->IsMeshDescriptionValid(0))
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{
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//Warn the user that there is no mesh description data
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UE_LOG(LogStaticMeshBuilder, Error, TEXT("Cannot find a valid mesh description to build the asset."));
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return false;
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}
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if (StaticMeshRenderData.LODResources.Num() > 0)
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{
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//At this point the render data is suppose to be empty
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UE_LOG(LogStaticMeshBuilder, Error, TEXT("Cannot build static mesh render data twice [%s]."), *StaticMesh->GetFullName());
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//Crash in debug
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checkSlow(StaticMeshRenderData.LODResources.Num() == 0);
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return false;
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}
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StaticMeshRenderData.AllocateLODResources(StaticMesh->SourceModels.Num());
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TArray<FMeshDescription> MeshDescriptions;
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MeshDescriptions.SetNum(StaticMesh->SourceModels.Num());
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const FMeshSectionInfoMap BeforeBuildSectionInfoMap = StaticMesh->SectionInfoMap;
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const FMeshSectionInfoMap BeforeBuildOriginalSectionInfoMap = StaticMesh->OriginalSectionInfoMap;
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for (int32 LodIndex = 0; LodIndex < StaticMesh->SourceModels.Num(); ++LodIndex)
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{
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float MaxDeviation = 0.0f;
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FMeshBuildSettings& LODBuildSettings = StaticMesh->SourceModels[LodIndex].BuildSettings;
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const FMeshDescription* OriginalMeshDescription = StaticMesh->GetMeshDescription(LodIndex);
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FMeshDescriptionHelper MeshDescriptionHelper(&LODBuildSettings);
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const FStaticMeshSourceModel& SrcModel = StaticMesh->SourceModels[LodIndex];
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FMeshReductionSettings ReductionSettings = LODGroup.GetSettings(SrcModel.ReductionSettings, LodIndex);
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//Make sure we do not reduce a non custom LOD by himself
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const int32 BaseReduceLodIndex = FMath::Clamp<int32>(ReductionSettings.BaseLODModel, 0, OriginalMeshDescription == nullptr ? LodIndex - 1 : LodIndex);
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// Use simplifier if a reduction in triangles or verts has been requested.
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bool bUseReduction = StaticMesh->IsReductionActive(LodIndex);
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if (OriginalMeshDescription != nullptr)
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{
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MeshDescriptionHelper.GetRenderMeshDescription(StaticMesh, *OriginalMeshDescription, MeshDescriptions[LodIndex]);
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}
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else
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{
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if (bUseReduction)
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{
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// Initialize an empty mesh description that the reduce will fill
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UStaticMesh::RegisterMeshAttributes(MeshDescriptions[LodIndex]);
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}
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else
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{
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//Duplicate the lodindex 0 we have a 100% reduction which is like a duplicate
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MeshDescriptions[LodIndex] = MeshDescriptions[BaseReduceLodIndex];
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//Set the overlapping threshold
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float ComparisonThreshold = StaticMesh->SourceModels[BaseReduceLodIndex].BuildSettings.bRemoveDegenerates ? THRESH_POINTS_ARE_SAME : 0.0f;
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MeshDescriptionHelper.FindOverlappingCorners(MeshDescriptions[LodIndex], ComparisonThreshold);
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if (LodIndex > 0)
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{
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//Make sure the SectionInfoMap is taken from the Base RawMesh
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int32 SectionNumber = StaticMesh->OriginalSectionInfoMap.GetSectionNumber(BaseReduceLodIndex);
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for (int32 SectionIndex = 0; SectionIndex < SectionNumber; ++SectionIndex)
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{
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//Keep the old data if its valid
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bool bHasValidLODInfoMap = StaticMesh->SectionInfoMap.IsValidSection(LodIndex, SectionIndex);
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//Section material index have to be remap with the ReductionSettings.BaseLODModel SectionInfoMap to create
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//a valid new section info map for the reduced LOD.
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if (!bHasValidLODInfoMap && StaticMesh->SectionInfoMap.IsValidSection(BaseReduceLodIndex, SectionIndex))
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{
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//Copy the BaseLODModel section info to the reduce LODIndex.
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FMeshSectionInfo SectionInfo = StaticMesh->SectionInfoMap.Get(BaseReduceLodIndex, SectionIndex);
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FMeshSectionInfo OriginalSectionInfo = StaticMesh->OriginalSectionInfoMap.Get(BaseReduceLodIndex, SectionIndex);
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StaticMesh->SectionInfoMap.Set(LodIndex, SectionIndex, SectionInfo);
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StaticMesh->OriginalSectionInfoMap.Set(LodIndex, SectionIndex, OriginalSectionInfo);
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}
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}
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}
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}
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if (LodIndex > 0)
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{
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LODBuildSettings = StaticMesh->SourceModels[BaseReduceLodIndex].BuildSettings;
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}
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}
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//Reduce LODs
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if (bUseReduction)
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{
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float OverlappingThreshold = LODBuildSettings.bRemoveDegenerates ? THRESH_POINTS_ARE_SAME : 0.0f;
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FOverlappingCorners OverlappingCorners;
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FMeshDescriptionOperations::FindOverlappingCorners(OverlappingCorners, MeshDescriptions[BaseReduceLodIndex], OverlappingThreshold);
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int32 OldSectionInfoMapCount = StaticMesh->SectionInfoMap.GetSectionNumber(LodIndex);
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if (LodIndex == BaseReduceLodIndex)
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{
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//When using LOD 0, we use a copy of the mesh description since reduce do not support inline reducing
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FMeshDescription BaseMeshDescription = MeshDescriptions[BaseReduceLodIndex];
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MeshDescriptionHelper.ReduceLOD(BaseMeshDescription, MeshDescriptions[LodIndex], ReductionSettings, OverlappingCorners, MaxDeviation);
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}
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else
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{
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MeshDescriptionHelper.ReduceLOD(MeshDescriptions[BaseReduceLodIndex], MeshDescriptions[LodIndex], ReductionSettings, OverlappingCorners, MaxDeviation);
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}
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const TPolygonGroupAttributesRef<FName> PolygonGroupImportedMaterialSlotNames = MeshDescriptions[LodIndex].PolygonGroupAttributes().GetAttributesRef<FName>(MeshAttribute::PolygonGroup::ImportedMaterialSlotName);
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const TPolygonGroupAttributesRef<FName> BasePolygonGroupImportedMaterialSlotNames = MeshDescriptions[BaseReduceLodIndex].PolygonGroupAttributes().GetAttributesRef<FName>(MeshAttribute::PolygonGroup::ImportedMaterialSlotName);
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// Recompute adjacency information. Since we change the vertices when we reduce
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MeshDescriptionHelper.FindOverlappingCorners(MeshDescriptions[LodIndex], OverlappingThreshold);
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//Make sure the static mesh SectionInfoMap is up to date with the new reduce LOD
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//We have to remap the material index with the ReductionSettings.BaseLODModel sectionInfoMap
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//Set the new SectionInfoMap for this reduced LOD base on the ReductionSettings.BaseLODModel SectionInfoMap
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TArray<int32> BaseUniqueMaterialIndexes;
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//Find all unique Material in used order
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for (const FPolygonGroupID& PolygonGroupID : MeshDescriptions[BaseReduceLodIndex].PolygonGroups().GetElementIDs())
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{
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int32 MaterialIndex = StaticMesh->GetMaterialIndexFromImportedMaterialSlotName(BasePolygonGroupImportedMaterialSlotNames[PolygonGroupID]);
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if (MaterialIndex == INDEX_NONE)
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{
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MaterialIndex = PolygonGroupID.GetValue();
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}
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BaseUniqueMaterialIndexes.AddUnique(MaterialIndex);
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}
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TArray<int32> UniqueMaterialIndex;
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//Find all unique Material in used order
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for (const FPolygonGroupID& PolygonGroupID : MeshDescriptions[LodIndex].PolygonGroups().GetElementIDs())
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{
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int32 MaterialIndex = StaticMesh->GetMaterialIndexFromImportedMaterialSlotName(PolygonGroupImportedMaterialSlotNames[PolygonGroupID]);
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if (MaterialIndex == INDEX_NONE)
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{
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MaterialIndex = PolygonGroupID.GetValue();
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}
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UniqueMaterialIndex.AddUnique(MaterialIndex);
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}
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//If the reduce did not output the same number of section use the base LOD sectionInfoMap
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bool bIsOldMappingInvalid = OldSectionInfoMapCount != UniqueMaterialIndex.Num();
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bool bValidBaseSectionInfoMap = BeforeBuildSectionInfoMap.GetSectionNumber(BaseReduceLodIndex) > 0;
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//All used material represent a different section
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for (int32 SectionIndex = 0; SectionIndex < UniqueMaterialIndex.Num(); ++SectionIndex)
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{
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//Keep the old data
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bool bHasValidLODInfoMap = !bIsOldMappingInvalid && BeforeBuildSectionInfoMap.IsValidSection(LodIndex, SectionIndex);
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//Section material index have to be remap with the ReductionSettings.BaseLODModel SectionInfoMap to create
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//a valid new section info map for the reduced LOD.
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//Find the base LOD section using this material
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if (!bHasValidLODInfoMap)
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{
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bool bSectionInfoSet = false;
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if (bValidBaseSectionInfoMap)
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{
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for (int32 BaseSectionIndex = 0; BaseSectionIndex < BaseUniqueMaterialIndexes.Num(); ++BaseSectionIndex)
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{
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if (UniqueMaterialIndex[SectionIndex] == BaseUniqueMaterialIndexes[BaseSectionIndex])
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{
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//Copy the base sectionInfoMap
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FMeshSectionInfo SectionInfo = BeforeBuildSectionInfoMap.Get(BaseReduceLodIndex, BaseSectionIndex);
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FMeshSectionInfo OriginalSectionInfo = BeforeBuildOriginalSectionInfoMap.Get(BaseReduceLodIndex, BaseSectionIndex);
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StaticMesh->SectionInfoMap.Set(LodIndex, SectionIndex, SectionInfo);
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StaticMesh->OriginalSectionInfoMap.Set(LodIndex, BaseSectionIndex, OriginalSectionInfo);
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bSectionInfoSet = true;
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break;
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}
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}
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}
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if (!bSectionInfoSet)
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{
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//Just set the default section info in case we did not found any match with the Base Lod
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FMeshSectionInfo SectionInfo;
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SectionInfo.MaterialIndex = SectionIndex;
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StaticMesh->SectionInfoMap.Set(LodIndex, SectionIndex, SectionInfo);
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StaticMesh->OriginalSectionInfoMap.Set(LodIndex, SectionIndex, SectionInfo);
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}
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}
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}
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}
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const FPolygonGroupArray& PolygonGroups = MeshDescriptions[LodIndex].PolygonGroups();
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FStaticMeshLODResources& StaticMeshLOD = StaticMeshRenderData.LODResources[LodIndex];
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StaticMeshLOD.MaxDeviation = MaxDeviation;
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//discover degenerate triangle with this threshold
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float VertexComparisonThreshold = LODBuildSettings.bRemoveDegenerates ? THRESH_POINTS_ARE_SAME : 0.0f;
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//Build new vertex buffers
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TArray< FStaticMeshBuildVertex > StaticMeshBuildVertices;
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TArray< uint32 > IndexBuffer;
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StaticMeshLOD.Sections.Empty(PolygonGroups.Num());
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TArray<int32> RemapVerts; //Because we will remove MeshVertex that are redundant, we need a remap
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//Render data Wedge map is only set for LOD 0???
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TArray<int32> TempWedgeMap;
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TArray<int32> &WedgeMap = (LodIndex == 0) ? StaticMeshRenderData.WedgeMap : TempWedgeMap;
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//Prepare the PerSectionIndices array so we can optimize the index buffer for the GPU
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TArray<TArray<uint32> > PerSectionIndices;
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PerSectionIndices.AddDefaulted(MeshDescriptions[LodIndex].PolygonGroups().Num());
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//Build the vertex and index buffer
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BuildVertexBuffer(StaticMesh, LodIndex, MeshDescriptions[LodIndex], StaticMeshLOD, LODBuildSettings, IndexBuffer, WedgeMap, PerSectionIndices, StaticMeshBuildVertices, MeshDescriptionHelper.GetOverlappingCorners(), VertexComparisonThreshold, RemapVerts);
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// Concatenate the per-section index buffers.
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TArray<uint32> CombinedIndices;
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bool bNeeds32BitIndices = false;
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for (int32 SectionIndex = 0; SectionIndex < StaticMeshLOD.Sections.Num(); SectionIndex++)
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{
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FStaticMeshSection& Section = StaticMeshLOD.Sections[SectionIndex];
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TArray<uint32> const& SectionIndices = PerSectionIndices[SectionIndex];
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Section.FirstIndex = 0;
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Section.NumTriangles = 0;
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Section.MinVertexIndex = 0;
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Section.MaxVertexIndex = 0;
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if (SectionIndices.Num())
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{
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Section.FirstIndex = CombinedIndices.Num();
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Section.NumTriangles = SectionIndices.Num() / 3;
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CombinedIndices.AddUninitialized(SectionIndices.Num());
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uint32* DestPtr = &CombinedIndices[Section.FirstIndex];
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uint32 const* SrcPtr = SectionIndices.GetData();
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Section.MinVertexIndex = *SrcPtr;
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Section.MaxVertexIndex = *SrcPtr;
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for (int32 Index = 0; Index < SectionIndices.Num(); Index++)
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{
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uint32 VertIndex = *SrcPtr++;
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bNeeds32BitIndices |= (VertIndex > MAX_uint16);
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Section.MinVertexIndex = FMath::Min<uint32>(VertIndex, Section.MinVertexIndex);
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Section.MaxVertexIndex = FMath::Max<uint32>(VertIndex, Section.MaxVertexIndex);
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*DestPtr++ = VertIndex;
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}
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}
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}
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const EIndexBufferStride::Type IndexBufferStride = bNeeds32BitIndices ? EIndexBufferStride::Force32Bit : EIndexBufferStride::Force16Bit;
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StaticMeshLOD.IndexBuffer.SetIndices(CombinedIndices, IndexBufferStride);
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BuildAllBufferOptimizations(StaticMeshLOD, LODBuildSettings, CombinedIndices, bNeeds32BitIndices, StaticMeshBuildVertices);
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} //End of LOD for loop
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// Calculate the bounding box.
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FBox BoundingBox(ForceInit);
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FPositionVertexBuffer& BasePositionVertexBuffer = StaticMeshRenderData.LODResources[0].VertexBuffers.PositionVertexBuffer;
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for (uint32 VertexIndex = 0; VertexIndex < BasePositionVertexBuffer.GetNumVertices(); VertexIndex++)
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{
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BoundingBox += BasePositionVertexBuffer.VertexPosition(VertexIndex);
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}
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BoundingBox.GetCenterAndExtents(StaticMeshRenderData.Bounds.Origin, StaticMeshRenderData.Bounds.BoxExtent);
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// Calculate the bounding sphere, using the center of the bounding box as the origin.
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StaticMeshRenderData.Bounds.SphereRadius = 0.0f;
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for (uint32 VertexIndex = 0; VertexIndex < BasePositionVertexBuffer.GetNumVertices(); VertexIndex++)
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{
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StaticMeshRenderData.Bounds.SphereRadius = FMath::Max(
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(BasePositionVertexBuffer.VertexPosition(VertexIndex) - StaticMeshRenderData.Bounds.Origin).Size(),
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StaticMeshRenderData.Bounds.SphereRadius
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);
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}
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return true;
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}
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bool AreVerticesEqual(FStaticMeshBuildVertex const& A, FStaticMeshBuildVertex const& B, float ComparisonThreshold)
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{
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if ( !A.Position.Equals(B.Position, ComparisonThreshold)
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|| !NormalsEqual(A.TangentX, B.TangentX)
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|| !NormalsEqual(A.TangentY, B.TangentY)
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|| !NormalsEqual(A.TangentZ, B.TangentZ)
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|| A.Color != B.Color)
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{
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return false;
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}
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// UVs
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for (int32 UVIndex = 0; UVIndex < MAX_STATIC_TEXCOORDS; UVIndex++)
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{
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if (!UVsEqual(A.UVs[UVIndex], B.UVs[UVIndex]))
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{
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return false;
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}
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}
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return true;
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}
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void BuildVertexBuffer(
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UStaticMesh *StaticMesh
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, int32 LodIndex
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, const FMeshDescription& MeshDescription
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, FStaticMeshLODResources& StaticMeshLOD
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, const FMeshBuildSettings& LODBuildSettings
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, TArray< uint32 >& IndexBuffer
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, TArray<int32>& OutWedgeMap
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, TArray<TArray<uint32> >& OutPerSectionIndices
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, TArray< FStaticMeshBuildVertex >& StaticMeshBuildVertices
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, const FOverlappingCorners& OverlappingCorners
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, float VertexComparisonThreshold
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, TArray<int32>& RemapVerts)
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{
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const FVertexArray& Vertices = MeshDescription.Vertices();
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const FVertexInstanceArray& VertexInstances = MeshDescription.VertexInstances();
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const FPolygonGroupArray& PolygonGroupArray = MeshDescription.PolygonGroups();
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const FPolygonArray& PolygonArray = MeshDescription.Polygons();
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TArray<int32> RemapVertexInstanceID;
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// set up vertex buffer elements
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StaticMeshBuildVertices.Reserve(VertexInstances.GetArraySize());
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bool bHasColor = false;
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TPolygonGroupAttributesConstRef<FName> PolygonGroupImportedMaterialSlotNames = MeshDescription.PolygonGroupAttributes().GetAttributesRef<FName>(MeshAttribute::PolygonGroup::ImportedMaterialSlotName);
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TVertexAttributesConstRef<FVector> VertexPositions = MeshDescription.VertexAttributes().GetAttributesRef<FVector>( MeshAttribute::Vertex::Position );
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TVertexInstanceAttributesConstRef<FVector> VertexInstanceNormals = MeshDescription.VertexInstanceAttributes().GetAttributesRef<FVector>( MeshAttribute::VertexInstance::Normal );
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TVertexInstanceAttributesConstRef<FVector> VertexInstanceTangents = MeshDescription.VertexInstanceAttributes().GetAttributesRef<FVector>( MeshAttribute::VertexInstance::Tangent );
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TVertexInstanceAttributesConstRef<float> VertexInstanceBinormalSigns = MeshDescription.VertexInstanceAttributes().GetAttributesRef<float>( MeshAttribute::VertexInstance::BinormalSign );
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TVertexInstanceAttributesConstRef<FVector4> VertexInstanceColors = MeshDescription.VertexInstanceAttributes().GetAttributesRef<FVector4>( MeshAttribute::VertexInstance::Color );
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TVertexInstanceAttributesConstRef<FVector2D> VertexInstanceUVs = MeshDescription.VertexInstanceAttributes().GetAttributesRef<FVector2D>( MeshAttribute::VertexInstance::TextureCoordinate );
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const uint32 NumTextureCoord = VertexInstanceUVs.GetNumIndices();
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TMap<FPolygonGroupID, int32> PolygonGroupToSectionIndex;
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for (const FPolygonGroupID PolygonGroupID : MeshDescription.PolygonGroups().GetElementIDs())
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{
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int32& SectionIndex = PolygonGroupToSectionIndex.FindOrAdd(PolygonGroupID);
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SectionIndex = StaticMeshLOD.Sections.Add(FStaticMeshSection());
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FStaticMeshSection& StaticMeshSection = StaticMeshLOD.Sections[SectionIndex];
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StaticMeshSection.MaterialIndex = StaticMesh->GetMaterialIndexFromImportedMaterialSlotName(PolygonGroupImportedMaterialSlotNames[PolygonGroupID]);
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if (StaticMeshSection.MaterialIndex == INDEX_NONE)
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{
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StaticMeshSection.MaterialIndex = PolygonGroupID.GetValue();
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}
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}
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int32 ReserveIndicesCount = 0;
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for (const FPolygonID& PolygonID : MeshDescription.Polygons().GetElementIDs())
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{
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const TArray<FMeshTriangle>& PolygonTriangles = MeshDescription.GetPolygonTriangles(PolygonID);
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ReserveIndicesCount += PolygonTriangles.Num() * 3;
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}
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IndexBuffer.Reset(ReserveIndicesCount);
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//Fill the remap array
|
|
RemapVerts.AddZeroed(ReserveIndicesCount);
|
|
for (int32& RemapIndex : RemapVerts)
|
|
{
|
|
RemapIndex = INDEX_NONE;
|
|
}
|
|
|
|
//Initialize the wedge map array tracking correspondence between wedge index and rendering vertex index
|
|
OutWedgeMap.Reset();
|
|
OutWedgeMap.AddZeroed(ReserveIndicesCount);
|
|
|
|
int32 WedgeIndex = 0;
|
|
for (const FPolygonID& PolygonID : MeshDescription.Polygons().GetElementIDs())
|
|
{
|
|
const FPolygonGroupID PolygonGroupID = MeshDescription.GetPolygonPolygonGroup(PolygonID);
|
|
const int32 SectionIndex = PolygonGroupToSectionIndex[PolygonGroupID];
|
|
TArray<uint32>& SectionIndices = OutPerSectionIndices[SectionIndex];
|
|
|
|
const TArray<FMeshTriangle>& PolygonTriangles = MeshDescription.GetPolygonTriangles(PolygonID);
|
|
uint32 MinIndex = TNumericLimits< uint32 >::Max();
|
|
uint32 MaxIndex = TNumericLimits< uint32 >::Min();
|
|
for (int32 TriangleIndex = 0; TriangleIndex < PolygonTriangles.Num(); ++TriangleIndex)
|
|
{
|
|
const FMeshTriangle& Triangle = PolygonTriangles[TriangleIndex];
|
|
|
|
FVector CornerPositions[3];
|
|
for (int32 TriVert = 0; TriVert < 3; ++TriVert)
|
|
{
|
|
const FVertexInstanceID VertexInstanceID = Triangle.GetVertexInstanceID(TriVert);
|
|
const FVertexID VertexID = MeshDescription.GetVertexInstanceVertex(VertexInstanceID);
|
|
CornerPositions[TriVert] = VertexPositions[VertexID];
|
|
}
|
|
FOverlappingThresholds OverlappingThresholds;
|
|
OverlappingThresholds.ThresholdPosition = VertexComparisonThreshold;
|
|
// Don't process degenerate triangles.
|
|
if (PointsEqual(CornerPositions[0], CornerPositions[1], OverlappingThresholds)
|
|
|| PointsEqual(CornerPositions[0], CornerPositions[2], OverlappingThresholds)
|
|
|| PointsEqual(CornerPositions[1], CornerPositions[2], OverlappingThresholds))
|
|
{
|
|
continue;
|
|
}
|
|
|
|
for (int32 TriVert = 0; TriVert < 3; ++TriVert, ++WedgeIndex)
|
|
{
|
|
const FVertexInstanceID VertexInstanceID = Triangle.GetVertexInstanceID(TriVert);
|
|
const int32 VertexInstanceValue = VertexInstanceID.GetValue();
|
|
const FVector& VertexPosition = CornerPositions[TriVert];
|
|
const FVector& VertexInstanceNormal = VertexInstanceNormals[VertexInstanceID];
|
|
const FVector& VertexInstanceTangent = VertexInstanceTangents[VertexInstanceID];
|
|
const float VertexInstanceBinormalSign = VertexInstanceBinormalSigns[VertexInstanceID];
|
|
const FVector4& VertexInstanceColor = VertexInstanceColors[VertexInstanceID];
|
|
|
|
const FLinearColor LinearColor(VertexInstanceColor);
|
|
if (LinearColor != FLinearColor::White)
|
|
{
|
|
bHasColor = true;
|
|
}
|
|
|
|
FStaticMeshBuildVertex StaticMeshVertex;
|
|
|
|
StaticMeshVertex.Position = VertexPosition * LODBuildSettings.BuildScale3D;
|
|
const FMatrix ScaleMatrix = FScaleMatrix(LODBuildSettings.BuildScale3D).Inverse().GetTransposed();
|
|
StaticMeshVertex.TangentX = ScaleMatrix.TransformVector(VertexInstanceTangent).GetSafeNormal();
|
|
StaticMeshVertex.TangentY = ScaleMatrix.TransformVector(FVector::CrossProduct(VertexInstanceNormal, VertexInstanceTangent).GetSafeNormal() * VertexInstanceBinormalSign).GetSafeNormal();
|
|
StaticMeshVertex.TangentZ = ScaleMatrix.TransformVector(VertexInstanceNormal).GetSafeNormal();
|
|
StaticMeshVertex.Color = LinearColor.ToFColor(true);
|
|
const uint32 MaxNumTexCoords = FMath::Min<int32>(MAX_MESH_TEXTURE_COORDS_MD, MAX_STATIC_TEXCOORDS);
|
|
for (uint32 UVIndex = 0; UVIndex < MaxNumTexCoords; ++UVIndex)
|
|
{
|
|
if(UVIndex < NumTextureCoord)
|
|
{
|
|
StaticMeshVertex.UVs[UVIndex] = VertexInstanceUVs.Get(VertexInstanceID, UVIndex);
|
|
}
|
|
else
|
|
{
|
|
StaticMeshVertex.UVs[UVIndex] = FVector2D(0.0f, 0.0f);
|
|
}
|
|
}
|
|
|
|
|
|
//Never add duplicated vertex instance
|
|
//Use WedgeIndex since OverlappingCorners has been built based on that
|
|
const TArray<int32>& DupVerts = OverlappingCorners.FindIfOverlapping(WedgeIndex);
|
|
|
|
int32 Index = INDEX_NONE;
|
|
for (int32 k = 0; k < DupVerts.Num(); k++)
|
|
{
|
|
if (DupVerts[k] >= WedgeIndex)
|
|
{
|
|
break;
|
|
}
|
|
int32 Location = RemapVerts.IsValidIndex(DupVerts[k]) ? RemapVerts[DupVerts[k]] : INDEX_NONE;
|
|
if (Location != INDEX_NONE && AreVerticesEqual(StaticMeshVertex, StaticMeshBuildVertices[Location], VertexComparisonThreshold))
|
|
{
|
|
Index = Location;
|
|
break;
|
|
}
|
|
}
|
|
if (Index == INDEX_NONE)
|
|
{
|
|
Index = StaticMeshBuildVertices.Add(StaticMeshVertex);
|
|
}
|
|
RemapVerts[WedgeIndex] = Index;
|
|
const uint32 RenderingVertexIndex = Index;
|
|
IndexBuffer.Add(RenderingVertexIndex);
|
|
OutWedgeMap[WedgeIndex] = RenderingVertexIndex;
|
|
SectionIndices.Add(RenderingVertexIndex);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
//Optimize before setting the buffer
|
|
if (VertexInstances.GetArraySize() < 100000 * 3)
|
|
{
|
|
BuildOptimizationHelper::CacheOptimizeVertexAndIndexBuffer(StaticMeshBuildVertices, OutPerSectionIndices, OutWedgeMap);
|
|
//check(OutWedgeMap.Num() == MeshDescription->VertexInstances().Num());
|
|
}
|
|
|
|
StaticMeshLOD.VertexBuffers.StaticMeshVertexBuffer.SetUseHighPrecisionTangentBasis(LODBuildSettings.bUseHighPrecisionTangentBasis);
|
|
StaticMeshLOD.VertexBuffers.StaticMeshVertexBuffer.SetUseFullPrecisionUVs(LODBuildSettings.bUseFullPrecisionUVs);
|
|
StaticMeshLOD.VertexBuffers.StaticMeshVertexBuffer.Init(StaticMeshBuildVertices, NumTextureCoord);
|
|
StaticMeshLOD.VertexBuffers.PositionVertexBuffer.Init(StaticMeshBuildVertices);
|
|
StaticMeshLOD.VertexBuffers.ColorVertexBuffer.Init(StaticMeshBuildVertices);
|
|
}
|
|
|
|
void BuildAllBufferOptimizations(FStaticMeshLODResources& StaticMeshLOD, const FMeshBuildSettings& LODBuildSettings, TArray< uint32 >& IndexBuffer, bool bNeeds32BitIndices, TArray< FStaticMeshBuildVertex >& StaticMeshBuildVertices)
|
|
{
|
|
if (StaticMeshLOD.AdditionalIndexBuffers == nullptr)
|
|
{
|
|
StaticMeshLOD.AdditionalIndexBuffers = new FAdditionalStaticMeshIndexBuffers();
|
|
}
|
|
|
|
const EIndexBufferStride::Type IndexBufferStride = bNeeds32BitIndices ? EIndexBufferStride::Force32Bit : EIndexBufferStride::Force16Bit;
|
|
|
|
// Build the reversed index buffer.
|
|
if (LODBuildSettings.bBuildReversedIndexBuffer)
|
|
{
|
|
TArray<uint32> InversedIndices;
|
|
const int32 IndexCount = IndexBuffer.Num();
|
|
InversedIndices.AddUninitialized(IndexCount);
|
|
|
|
for (int32 SectionIndex = 0; SectionIndex < StaticMeshLOD.Sections.Num(); ++SectionIndex)
|
|
{
|
|
const FStaticMeshSection& SectionInfo = StaticMeshLOD.Sections[SectionIndex];
|
|
const int32 SectionIndexCount = SectionInfo.NumTriangles * 3;
|
|
|
|
for (int32 i = 0; i < SectionIndexCount; ++i)
|
|
{
|
|
InversedIndices[SectionInfo.FirstIndex + i] = IndexBuffer[SectionInfo.FirstIndex + SectionIndexCount - 1 - i];
|
|
}
|
|
}
|
|
StaticMeshLOD.AdditionalIndexBuffers->ReversedIndexBuffer.SetIndices(InversedIndices, IndexBufferStride);
|
|
}
|
|
|
|
// Build the depth-only index buffer.
|
|
TArray<uint32> DepthOnlyIndices;
|
|
{
|
|
BuildOptimizationHelper::BuildDepthOnlyIndexBuffer(
|
|
DepthOnlyIndices,
|
|
StaticMeshBuildVertices,
|
|
IndexBuffer,
|
|
StaticMeshLOD.Sections
|
|
);
|
|
|
|
if (DepthOnlyIndices.Num() < 50000 * 3)
|
|
{
|
|
BuildOptimizationThirdParty::CacheOptimizeIndexBuffer(DepthOnlyIndices);
|
|
}
|
|
|
|
StaticMeshLOD.DepthOnlyIndexBuffer.SetIndices(DepthOnlyIndices, IndexBufferStride);
|
|
}
|
|
|
|
// Build the inversed depth only index buffer.
|
|
if (LODBuildSettings.bBuildReversedIndexBuffer)
|
|
{
|
|
TArray<uint32> ReversedDepthOnlyIndices;
|
|
const int32 IndexCount = DepthOnlyIndices.Num();
|
|
ReversedDepthOnlyIndices.AddUninitialized(IndexCount);
|
|
for (int32 i = 0; i < IndexCount; ++i)
|
|
{
|
|
ReversedDepthOnlyIndices[i] = DepthOnlyIndices[IndexCount - 1 - i];
|
|
}
|
|
StaticMeshLOD.AdditionalIndexBuffers->ReversedDepthOnlyIndexBuffer.SetIndices(ReversedDepthOnlyIndices, IndexBufferStride);
|
|
}
|
|
|
|
// Build a list of wireframe edges in the static mesh.
|
|
{
|
|
TArray<BuildOptimizationHelper::FMeshEdge> Edges;
|
|
TArray<uint32> WireframeIndices;
|
|
|
|
BuildOptimizationHelper::FStaticMeshEdgeBuilder(IndexBuffer, StaticMeshBuildVertices, Edges).FindEdges();
|
|
WireframeIndices.Empty(2 * Edges.Num());
|
|
for (int32 EdgeIndex = 0; EdgeIndex < Edges.Num(); EdgeIndex++)
|
|
{
|
|
BuildOptimizationHelper::FMeshEdge& Edge = Edges[EdgeIndex];
|
|
WireframeIndices.Add(Edge.Vertices[0]);
|
|
WireframeIndices.Add(Edge.Vertices[1]);
|
|
}
|
|
StaticMeshLOD.AdditionalIndexBuffers->WireframeIndexBuffer.SetIndices(WireframeIndices, IndexBufferStride);
|
|
}
|
|
|
|
// Build the adjacency index buffer used for tessellation.
|
|
if (LODBuildSettings.bBuildAdjacencyBuffer)
|
|
{
|
|
TArray<uint32> AdjacencyIndices;
|
|
|
|
BuildOptimizationThirdParty::NvTriStripHelper::BuildStaticAdjacencyIndexBuffer(
|
|
StaticMeshLOD.VertexBuffers.PositionVertexBuffer,
|
|
StaticMeshLOD.VertexBuffers.StaticMeshVertexBuffer,
|
|
IndexBuffer,
|
|
AdjacencyIndices
|
|
);
|
|
StaticMeshLOD.AdditionalIndexBuffers->AdjacencyIndexBuffer.SetIndices(AdjacencyIndices, IndexBufferStride);
|
|
}
|
|
}
|