FNormalFlowRemesher

Remeshing with "face aligned projection".

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Inheritance Hierarchy

FMeshRefinerBase

FRemesher

FQueueRemesher

FNormalFlowRemesher

References

Module	DynamicMesh
Header	/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/NormalFlowRemesher.h
Include	#include "NormalFlowRemesher.h"

Syntax

class FNormalFlowRemesher : public UE::Geometry::FQueueRemesher

Remarks

Remeshing with "face aligned projection". This approach to projection attempts to preserve sharp features in the mesh by aligning triangle normals with normals from the original mesh during the projection pass. This class also performs a pass of edge flips aimed at further aligning triangle normals to their originals. This can be helpful in fixing the occasional single "bad edge" along a sequence of feature edges.

Variables

	Name	Description
bool	bEnableParallelEdgeFlipPass	Gather candidates for edge flipping in parallel, then do the actual flips sequentially.
bool	bSmoothInFillAreas	Control whether or not we want to apply mesh smoothing in "free" areas that have not projected to target surface.
int	FaceProjectionPassesPerRemeshIteration	During each call to RemeshIteration, do this many passes of face-aligned projection.
float	FillAreaDistanceMultiplier	This is used as a multiplier on MaxEdgeLength to determine when we identify points as being in "free" areas.
float	FillAreaSmoothMultiplier	This is used as a multiplier on the Remesher smoothing rate, applied to points identified as being in "free" areas.
int	MaxTriangleCount	Cap on triangle count, to prevent runaway mesh messes. Ignored if zero.
double	NormalAlignmentSpeed	Drag on normal alignment
int	NumExtraProjectionIterations	Additional projection iterations after the usual remesh step.
TArray< FVector...	ProjectionVertexBuffer	Per triangle-vertex projection positions for face projection pass. (Size >= 3 * MaxTriangleID)
TArray< double ...	ProjectionWeightBuffer	Per triangle-vertex weights for face projection pass. (Size >= 3 * MaxTriangleID)
double	SurfaceProjectionSpeed	Drag on surface projection
TArray< double ...	TempWeightBuffer

Constructors

	Name	Description
	FNormalFlowRemesher ( FDynamicMesh3* MeshIn )

Functions

	Name	Description
bool	EdgeFlipWouldReduceNormalError ( int EdgeID, double BadEdgeErrorThreshold, double ImprovementRatioThreshold )	Test to see if flipping an edge would improve "normal error".
void	InitializeVertexBufferForFacePass()	Similar to InitializeVertexBufferForPass, but also initialize the additional per-vertex weight buffer.
void	RemeshWithFaceProjection()	Do remeshing with face-aligned projection.
void	TrackedEdgeFlipPass()	Flip all edges for which EdgeFlipWouldReduceNormalError returns true
void	TrackedFaceProjectionPass ( double& MaxDistanceMoved, bool bIsTuningIteration )	Perform face-aligned projection onto the target mesh. Queue edges whose lengths change because of it.
void	TrackedFaceProjectionPass_Serial ( double& MaxDistanceMoved, bool bIsTuningIteration )	Perform face-aligned projection onto the target mesh. Queue edges whose lengths change because of it.

Overridden from FQueueRemesher

		Name	Description
	void	TrackedFullProjectionPass ( bool bParallel )	This is called during RemeshIteration.

Overridden from FRemesher

		Name	Description
	void	BasicRemeshPass()	"Outer loop" for all remeshing operations