You've already forked UnrealEngineUWP
mirror of
https://github.com/izzy2lost/UnrealEngineUWP.git
synced 2026-03-26 18:15:20 -07:00
120 lines
5.3 KiB
C++
120 lines
5.3 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
|
|
|
|
#include "MeshDescriptionHelper.h"
|
|
|
|
#include "BuildStatisticManager.h"
|
|
#include "CoreMinimal.h"
|
|
#include "CoreTypes.h"
|
|
#include "Engine/EngineTypes.h"
|
|
#include "Engine/StaticMesh.h"
|
|
#include "IMeshReductionInterfaces.h"
|
|
#include "IMeshReductionManagerModule.h"
|
|
#include "Materials/Material.h"
|
|
#include "Modules/ModuleManager.h"
|
|
#include "RawMesh.h"
|
|
#include "RenderUtils.h"
|
|
#include "StaticMeshAttributes.h"
|
|
#include "Serialization/MemoryWriter.h"
|
|
#include "Serialization/MemoryReader.h"
|
|
#include "StaticMeshOperations.h"
|
|
#include "UObject/Package.h"
|
|
#include "UObject/UObjectGlobals.h"
|
|
|
|
//Enable all check
|
|
//#define ENABLE_NTB_CHECK
|
|
|
|
DEFINE_LOG_CATEGORY(LogMeshDescriptionBuildStatistic);
|
|
|
|
FMeshDescriptionHelper::FMeshDescriptionHelper(FMeshBuildSettings* InBuildSettings)
|
|
: BuildSettings(InBuildSettings)
|
|
{
|
|
}
|
|
|
|
void FMeshDescriptionHelper::SetupRenderMeshDescription(UObject* Owner, FMeshDescription& RenderMeshDescription)
|
|
{
|
|
TRACE_CPUPROFILER_EVENT_SCOPE(FMeshDescriptionHelper::GetRenderMeshDescription);
|
|
|
|
UStaticMesh* StaticMesh = Cast<UStaticMesh>(Owner);
|
|
check(StaticMesh);
|
|
|
|
float ComparisonThreshold = BuildSettings->bRemoveDegenerates ? THRESH_POINTS_ARE_SAME : 0.0f;
|
|
|
|
//This function make sure the Polygon Normals Tangents Binormals are computed and also remove degenerated triangle from the render mesh description.
|
|
FStaticMeshOperations::ComputePolygonTangentsAndNormals(RenderMeshDescription, ComparisonThreshold);
|
|
//OutRenderMeshDescription->ComputePolygonTangentsAndNormals(BuildSettings->bRemoveDegenerates ? SMALL_NUMBER : 0.0f);
|
|
|
|
FVertexInstanceArray& VertexInstanceArray = RenderMeshDescription.VertexInstances();
|
|
TVertexInstanceAttributesRef<FVector> Normals = RenderMeshDescription.VertexInstanceAttributes().GetAttributesRef<FVector>( MeshAttribute::VertexInstance::Normal );
|
|
TVertexInstanceAttributesRef<FVector> Tangents = RenderMeshDescription.VertexInstanceAttributes().GetAttributesRef<FVector>( MeshAttribute::VertexInstance::Tangent );
|
|
TVertexInstanceAttributesRef<float> BinormalSigns = RenderMeshDescription.VertexInstanceAttributes().GetAttributesRef<float>( MeshAttribute::VertexInstance::BinormalSign );
|
|
|
|
// Find overlapping corners to accelerate adjacency.
|
|
FStaticMeshOperations::FindOverlappingCorners(OverlappingCorners, RenderMeshDescription, ComparisonThreshold);
|
|
|
|
// Compute any missing normals or tangents.
|
|
{
|
|
// Static meshes always blend normals of overlapping corners.
|
|
EComputeNTBsFlags ComputeNTBsOptions = EComputeNTBsFlags::BlendOverlappingNormals;
|
|
ComputeNTBsOptions |= BuildSettings->bRemoveDegenerates ? EComputeNTBsFlags::IgnoreDegenerateTriangles : EComputeNTBsFlags::None;
|
|
ComputeNTBsOptions |= BuildSettings->bComputeWeightedNormals ? EComputeNTBsFlags::WeightedNTBs : EComputeNTBsFlags::None;
|
|
ComputeNTBsOptions |= BuildSettings->bRecomputeNormals ? EComputeNTBsFlags::Normals : EComputeNTBsFlags::None;
|
|
ComputeNTBsOptions |= BuildSettings->bRecomputeTangents ? EComputeNTBsFlags::Tangents : EComputeNTBsFlags::None;
|
|
ComputeNTBsOptions |= BuildSettings->bUseMikkTSpace ? EComputeNTBsFlags::UseMikkTSpace : EComputeNTBsFlags::None;
|
|
|
|
FStaticMeshOperations::ComputeTangentsAndNormals(RenderMeshDescription, ComputeNTBsOptions);
|
|
}
|
|
|
|
if (BuildSettings->bGenerateLightmapUVs && VertexInstanceArray.Num() > 0)
|
|
{
|
|
TVertexInstanceAttributesRef<FVector2D> VertexInstanceUVs = RenderMeshDescription.VertexInstanceAttributes().GetAttributesRef<FVector2D>(MeshAttribute::VertexInstance::TextureCoordinate);
|
|
int32 NumIndices = VertexInstanceUVs.GetNumIndices();
|
|
//Verify the src light map channel
|
|
if (BuildSettings->SrcLightmapIndex >= NumIndices)
|
|
{
|
|
BuildSettings->SrcLightmapIndex = 0;
|
|
}
|
|
//Verify the destination light map channel
|
|
if (BuildSettings->DstLightmapIndex >= NumIndices)
|
|
{
|
|
//Make sure we do not add illegal UV Channel index
|
|
if (BuildSettings->DstLightmapIndex >= MAX_MESH_TEXTURE_COORDS_MD)
|
|
{
|
|
BuildSettings->DstLightmapIndex = MAX_MESH_TEXTURE_COORDS_MD - 1;
|
|
}
|
|
|
|
//Add some unused UVChannel to the mesh description for the lightmapUVs
|
|
VertexInstanceUVs.SetNumIndices(BuildSettings->DstLightmapIndex + 1);
|
|
BuildSettings->DstLightmapIndex = NumIndices;
|
|
}
|
|
FStaticMeshOperations::CreateLightMapUVLayout(RenderMeshDescription,
|
|
BuildSettings->SrcLightmapIndex,
|
|
BuildSettings->DstLightmapIndex,
|
|
BuildSettings->MinLightmapResolution,
|
|
(ELightmapUVVersion)(StaticMesh->LightmapUVVersion),
|
|
OverlappingCorners);
|
|
}
|
|
}
|
|
|
|
void FMeshDescriptionHelper::ReduceLOD(const FMeshDescription& BaseMesh, FMeshDescription& DestMesh, const FMeshReductionSettings& ReductionSettings, const FOverlappingCorners& InOverlappingCorners, float &OutMaxDeviation)
|
|
{
|
|
IMeshReductionManagerModule& MeshReductionModule = FModuleManager::Get().LoadModuleChecked<IMeshReductionManagerModule>("MeshReductionInterface");
|
|
IMeshReduction* MeshReduction = MeshReductionModule.GetStaticMeshReductionInterface();
|
|
|
|
|
|
if (!MeshReduction)
|
|
{
|
|
// no reduction possible
|
|
OutMaxDeviation = 0.f;
|
|
return;
|
|
}
|
|
|
|
OutMaxDeviation = ReductionSettings.MaxDeviation;
|
|
MeshReduction->ReduceMeshDescription(DestMesh, OutMaxDeviation, BaseMesh, InOverlappingCorners, ReductionSettings);
|
|
}
|
|
|
|
void FMeshDescriptionHelper::FindOverlappingCorners(const FMeshDescription& MeshDescription, float ComparisonThreshold)
|
|
{
|
|
FStaticMeshOperations::FindOverlappingCorners(OverlappingCorners, MeshDescription, ComparisonThreshold);
|
|
}
|
|
|