135 lines
3.6 KiB
C++
135 lines
3.6 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "Containers/Array.h"
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#include "CoreMinimal.h"
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#include "Misc/CoreMiscDefines.h"
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#include "Math/UnrealMathSSE.h"
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#include "Math/Vector.h"
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#include "Math/Vector2D.h"
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#include "Templates/Function.h"
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#include "Tessellation/AdaptiveTessellator.h"
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#include <atomic>
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struct FLerpVert;
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namespace Nanite
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{
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namespace AdaptiveTessellation
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{
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using FDispFunc = TFunctionRef< FVector3f(
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const FVector3f&, // Barycentrics,
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const FLerpVert&, // Vert0,
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const FLerpVert&, // Vert1,
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const FLerpVert&, // Vert2,
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int32 // MaterialIndex
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) >;
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using FBoundsFunc = TFunctionRef< FVector2f(
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const FVector3f[3], // Barycentrics[3],
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const FLerpVert&, // Vert0,
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const FLerpVert&, // Vert1,
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const FLerpVert&, // Vert2,
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const FVector3f&, // Displacement0,
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const FVector3f&, // Displacement1,
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const FVector3f&, // Displacement2,
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int32 // MaterialIndex
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) >;
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using FNumFunc = TFunctionRef< int32(
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const FVector3f[3], // Barycentrics[3],
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const FLerpVert&, // Vert0,
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const FLerpVert&, // Vert1,
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const FLerpVert&, // Vert2,
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int32 // MaterialIndex
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) >;
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class UE_DEPRECATED(5.9, "Nanite::FAdaptiveTessellator has moved to UE::GeometryCore::FAdaptiveTessellator")
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FAdaptiveTessellator
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{
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public:
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NANITEUTILITIES_API FAdaptiveTessellator(
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TArray< FLerpVert >& InVerts,
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TArray< uint32 >& InIndexes,
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TArray< int32 >& InMaterialIndexes,
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float InTargetError,
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float InSampleRate,
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bool bCrackFree,
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FDispFunc InGetDisplacement,
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FBoundsFunc InGetErrorBounds,
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FNumFunc InGetNumSamples,
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bool bApplyDisplacement = true
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);
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protected:
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FDispFunc GetDisplacement;
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FBoundsFunc GetErrorBounds;
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FNumFunc GetNumSamples;
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float TargetError;
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float SampleRate;
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TArray< FLerpVert >& Verts;
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TArray< uint32 >& Indexes;
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TArray< int32 >& MaterialIndexes;
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TArray< FVector3f > Displacements;
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TArray< int32 > AdjEdges;
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struct FTriangle
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{
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FVector3f SplitBarycentrics;
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int32 RequestIndex = -1;
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};
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TArray< FTriangle > Triangles;
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TArray< uint32 > FindRequests;
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TArray< uint32 > SplitRequests;
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std::atomic< uint32 > NumSplits;
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void AddFindRequest( uint32 TriIndex );
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void RemoveSplitRequest( uint32 TriIndex );
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void LinkEdge( int32 EdgeIndex0, int32 EdgeIndex1 );
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FVector3f GetTriNormal( uint32 TriIndex ) const;
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bool CouldFlipEdge( uint32 EdgeIndex ) const;
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void TryDelaunayFlip( uint32 EdgeIndex );
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void FindSplit( uint32 TriIndex );
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void FindSplitBVH( uint32 TriIndex );
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void SplitTriangle( uint32 TriIndex );
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};
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/**
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* Apply adaptive displacement to the input mesh.
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*
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* @param Verts vertices
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* @param Indexes triangles, expressed as vertex indices grouped as triplets
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* @param MaterialIndexes material ids per triangle
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* @param TargetError refine until TargetError^2 is reached in GetErrorBounds callback.
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* @param SampleRate feature size (one-dimensional) up to which features are sampled in the displacement function
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* @param bCrackFree if enabled, vertices that previously coincided remain at the same position even if disconnected
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* @param GetDisplacement callback to evaluate the displacement
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* @param GetErrorBounds callback to query an error interval at a subtriangle
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* @param GetNumSamples callback to query the number of samples for a subtriangle
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*/
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NANITEUTILITIES_API void TessellateAdaptive(
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TArray< FLerpVert >& Verts,
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TArray< uint32 >& Indexes,
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TArray< int32 >& MaterialIndexes,
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float TargetError,
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float SampleRate,
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bool bCrackFree,
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FDispFunc GetDisplacement,
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FBoundsFunc GetErrorBounds,
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FNumFunc GetNumSamples,
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bool bApplyDisplacement = true, int32 InMode = -1);
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} // end namespace AdaptiveTessellation
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} // namespace Nanite
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