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6c573a2474
* r.LumenScene.MeshCardsMaxLOD controls representation quality. With 0 being a box projection * New card placement to focus on important parts of a mesh (skip non visible parts) * Replaced CubeMapTrees with MeshCards. Instead of a big volume texture lookup there are now 6 lists of decals (one per axis) * Merged distance field and mesh card Embree setup code into a set of common functions * Removed hardcoded limits of 6 cards per mesh #fyi Daniel.Wright, Patrick.Kelly, Yuriy.ODonnell [CL 15144947 by Krzysztof Narkowicz in ue5-main branch]
136 lines
2.8 KiB
C++
136 lines
2.8 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "MeshUtilities.h"
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#include "kDOP.h"
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#if USE_EMBREE
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#include <embree2/rtcore.h>
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#include <embree2/rtcore_ray.h>
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#else
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typedef void* RTCDevice;
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typedef void* RTCScene;
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#endif
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class FSourceMeshDataForDerivedDataTask;
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class FMeshBuildDataProvider
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{
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public:
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/** Initialization constructor. */
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FMeshBuildDataProvider(
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const TkDOPTree<const FMeshBuildDataProvider, uint32>& InkDopTree) :
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kDopTree(InkDopTree)
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{}
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// kDOP data provider interface.
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FORCEINLINE const TkDOPTree<const FMeshBuildDataProvider, uint32>& GetkDOPTree(void) const
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{
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return kDopTree;
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}
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FORCEINLINE const FMatrix& GetLocalToWorld(void) const
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{
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return FMatrix::Identity;
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}
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FORCEINLINE const FMatrix& GetWorldToLocal(void) const
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{
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return FMatrix::Identity;
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}
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FORCEINLINE FMatrix GetLocalToWorldTransposeAdjoint(void) const
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{
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return FMatrix::Identity;
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}
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FORCEINLINE float GetDeterminant(void) const
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{
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return 1.0f;
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}
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private:
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const TkDOPTree<const FMeshBuildDataProvider, uint32>& kDopTree;
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};
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struct FEmbreeTriangleDesc
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{
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int16 ElementIndex;
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};
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// Mapping between Embree Geometry Id and engine Mesh/LOD Id
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struct FEmbreeGeometry
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{
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TArray<FEmbreeTriangleDesc> TriangleDescs; // The material ID of each triangle.
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};
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class FEmbreeScene
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{
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public:
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bool bUseEmbree = false;
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int32 NumIndices = 0;
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// Embree
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RTCDevice EmbreeDevice = nullptr;
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RTCScene EmbreeScene = nullptr;
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FEmbreeGeometry Geometry;
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// DOP tree fallback
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TkDOPTree<const FMeshBuildDataProvider, uint32> kDopTree;
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};
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#if USE_EMBREE
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struct FEmbreeRay : public RTCRay
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{
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FEmbreeRay() :
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ElementIndex(-1)
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{
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u = v = 0;
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time = 0;
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mask = 0xFFFFFFFF;
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geomID = -1;
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instID = -1;
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primID = -1;
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}
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FVector GetHitNormal() const
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{
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return FVector(Ng[0], Ng[1], Ng[2]).GetSafeNormal();
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}
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bool IsHitTwoSided() const
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{
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// MaterialIndex on the build triangles was set to 1 if two-sided, or 0 if one-sided
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return ElementIndex == 1;
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}
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// Additional Outputs.
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int32 ElementIndex; // Material Index
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};
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#endif
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namespace MeshRepresentation
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{
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/**
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* Generates unit length, stratified and uniformly distributed direction samples in a hemisphere.
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*/
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void GenerateStratifiedUniformHemisphereSamples(int32 NumSamples, FRandomStream& RandomStream, TArray<FVector4>& Samples);
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/**
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* [Frisvad 2012, "Building an Orthonormal Basis from a 3D Unit Vector Without Normalization"]
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*/
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FMatrix GetTangentBasisFrisvad(FVector TangentZ);
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void SetupEmbreeScene(FString MeshName,
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const FSourceMeshDataForDerivedDataTask& SourceMeshData,
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const FStaticMeshLODResources& LODModel,
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const TArray<FSignedDistanceFieldBuildMaterialData>& MaterialBlendModes,
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bool bGenerateAsIfTwoSided,
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FEmbreeScene& EmbreeScene);
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void DeleteEmbreeScene(FEmbreeScene& EmbreeScene);
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}; |