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#jira UE-108752 #lockdown Simon.Tourangeau #rb Brian.Karis, Alexis.Matte #ROBOMERGE-SOURCE: CL 15992767 in //UE5/Release-5.0-EarlyAccess/... #ROBOMERGE-BOT: STARSHIP (Release-5.0-EarlyAccess -> Main) (v789-15992632) [CL 15992775 by richard talbotwatkin in ue5-main branch]
126 lines
5.2 KiB
C++
126 lines
5.2 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#include "MeshDescriptionHelper.h"
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#include "BuildStatisticManager.h"
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#include "CoreMinimal.h"
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#include "CoreTypes.h"
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#include "Engine/EngineTypes.h"
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#include "Engine/StaticMesh.h"
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#include "IMeshReductionInterfaces.h"
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#include "IMeshReductionManagerModule.h"
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#include "Materials/Material.h"
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#include "Modules/ModuleManager.h"
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#include "RawMesh.h"
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#include "RenderUtils.h"
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#include "StaticMeshAttributes.h"
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#include "Serialization/MemoryWriter.h"
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#include "Serialization/MemoryReader.h"
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#include "StaticMeshOperations.h"
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#include "UObject/Package.h"
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#include "UObject/UObjectGlobals.h"
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//Enable all check
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//#define ENABLE_NTB_CHECK
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DEFINE_LOG_CATEGORY(LogMeshDescriptionBuildStatistic);
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FMeshDescriptionHelper::FMeshDescriptionHelper(FMeshBuildSettings* InBuildSettings)
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: BuildSettings(InBuildSettings)
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{
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}
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void FMeshDescriptionHelper::SetupRenderMeshDescription(UObject* Owner, FMeshDescription& RenderMeshDescription)
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{
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TRACE_CPUPROFILER_EVENT_SCOPE(FMeshDescriptionHelper::GetRenderMeshDescription);
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UStaticMesh* StaticMesh = Cast<UStaticMesh>(Owner);
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check(StaticMesh);
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const bool bNaniteBuildEnabled = StaticMesh->NaniteSettings.bEnabled;
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float ComparisonThreshold = (BuildSettings->bRemoveDegenerates && !bNaniteBuildEnabled) ? THRESH_POINTS_ARE_SAME : 0.0f;
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//This function make sure the Polygon Normals Tangents Binormals are computed and also remove degenerated triangle from the render mesh description.
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FStaticMeshOperations::ComputeTriangleTangentsAndNormals(RenderMeshDescription, ComparisonThreshold);
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//OutRenderMeshDescription->ComputePolygonTangentsAndNormals(BuildSettings->bRemoveDegenerates ? SMALL_NUMBER : 0.0f);
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FVertexInstanceArray& VertexInstanceArray = RenderMeshDescription.VertexInstances();
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FStaticMeshAttributes Attributes(RenderMeshDescription);
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TVertexInstanceAttributesRef<FVector> Normals = Attributes.GetVertexInstanceNormals();
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TVertexInstanceAttributesRef<FVector> Tangents = Attributes.GetVertexInstanceTangents();
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TVertexInstanceAttributesRef<float> BinormalSigns = Attributes.GetVertexInstanceBinormalSigns();
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// Find overlapping corners to accelerate adjacency.
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FStaticMeshOperations::FindOverlappingCorners(OverlappingCorners, RenderMeshDescription, ComparisonThreshold);
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// Static meshes always blend normals of overlapping corners.
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EComputeNTBsFlags ComputeNTBsOptions = EComputeNTBsFlags::BlendOverlappingNormals;
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ComputeNTBsOptions |= BuildSettings->bComputeWeightedNormals ? EComputeNTBsFlags::WeightedNTBs : EComputeNTBsFlags::None;
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ComputeNTBsOptions |= BuildSettings->bRecomputeNormals ? EComputeNTBsFlags::Normals : EComputeNTBsFlags::None;
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ComputeNTBsOptions |= BuildSettings->bUseMikkTSpace ? EComputeNTBsFlags::UseMikkTSpace : EComputeNTBsFlags::None;
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// Set extra options for non-Nanite meshes
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if (!bNaniteBuildEnabled)
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{
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ComputeNTBsOptions |= BuildSettings->bRemoveDegenerates ? EComputeNTBsFlags::IgnoreDegenerateTriangles : EComputeNTBsFlags::None;
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ComputeNTBsOptions |= BuildSettings->bRecomputeTangents ? EComputeNTBsFlags::Tangents : EComputeNTBsFlags::None;
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}
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// Compute any missing normals or tangents.
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FStaticMeshOperations::ComputeTangentsAndNormals(RenderMeshDescription, ComputeNTBsOptions);
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if (BuildSettings->bGenerateLightmapUVs && VertexInstanceArray.Num() > 0)
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{
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TVertexInstanceAttributesRef<FVector2D> VertexInstanceUVs = Attributes.GetVertexInstanceUVs();
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int32 NumIndices = VertexInstanceUVs.GetNumChannels();
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//Verify the src light map channel
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if (BuildSettings->SrcLightmapIndex >= NumIndices)
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{
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BuildSettings->SrcLightmapIndex = 0;
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}
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//Verify the destination light map channel
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if (BuildSettings->DstLightmapIndex >= NumIndices)
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{
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//Make sure we do not add illegal UV Channel index
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if (BuildSettings->DstLightmapIndex >= MAX_MESH_TEXTURE_COORDS_MD)
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{
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BuildSettings->DstLightmapIndex = MAX_MESH_TEXTURE_COORDS_MD - 1;
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}
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//Add some unused UVChannel to the mesh description for the lightmapUVs
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VertexInstanceUVs.SetNumChannels(BuildSettings->DstLightmapIndex + 1);
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BuildSettings->DstLightmapIndex = NumIndices;
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}
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FStaticMeshOperations::CreateLightMapUVLayout(RenderMeshDescription,
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BuildSettings->SrcLightmapIndex,
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BuildSettings->DstLightmapIndex,
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BuildSettings->MinLightmapResolution,
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(ELightmapUVVersion)StaticMesh->GetLightmapUVVersion(),
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OverlappingCorners);
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}
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}
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void FMeshDescriptionHelper::ReduceLOD(const FMeshDescription& BaseMesh, FMeshDescription& DestMesh, const FMeshReductionSettings& ReductionSettings, const FOverlappingCorners& InOverlappingCorners, float &OutMaxDeviation)
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{
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IMeshReductionManagerModule& MeshReductionModule = FModuleManager::Get().LoadModuleChecked<IMeshReductionManagerModule>("MeshReductionInterface");
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IMeshReduction* MeshReduction = MeshReductionModule.GetStaticMeshReductionInterface();
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if (!MeshReduction)
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{
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// no reduction possible
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OutMaxDeviation = 0.f;
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return;
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}
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OutMaxDeviation = ReductionSettings.MaxDeviation;
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MeshReduction->ReduceMeshDescription(DestMesh, OutMaxDeviation, BaseMesh, InOverlappingCorners, ReductionSettings);
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}
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void FMeshDescriptionHelper::FindOverlappingCorners(const FMeshDescription& MeshDescription, float ComparisonThreshold)
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{
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FStaticMeshOperations::FindOverlappingCorners(OverlappingCorners, MeshDescription, ComparisonThreshold);
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}
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