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  3. TMeshLocalParam

TMeshLocalParam

[TMeshLocalParam](API\Runtime\GeometryCore\TMeshLocalParam) computes a local UV parameterization of a set of connected PointsWithNormals, where "local" means "in a geodesic disc around a starting point".

API > API/Runtime > API/Runtime/GeometryCore

TMeshLocalParam computes a local UV parameterization of a set of connected PointsWithNormals, where "local" means "in a geodesic disc around a starting point".

The computation is based on region-growing, and geodesic distances are actually graph distances, measured with Dijkstras algorithm.

Templated on the point set type, which must provide positions, normals, and neighbours. Currently will only work for FDynamicMesh3 and FDynamicPointSet3 because of call to PointSetType->VtxVerticesItr()

   
Name TMeshLocalParam
Type class
Header File /Engine/Source/Runtime/GeometryCore/Public/Parameterization/MeshLocalParam.h
Include Path #include "Parameterization/MeshLocalParam.h"

Syntax

template<class PointSetType>  
class TMeshLocalParam

Constructors

Name Remarks Include Path Unreal Specifiers

TMeshLocalParam ( const PointSetType* PointSetIn
)

   Parameterization/MeshLocalParam.h  

Structs

Name Remarks
FGraphNode Information about each active/computed point

Variables

Public

Name Type Remarks Include Path Unreal Specifiers
bEnableExternalNormals bool If true, ExternalNormalFunc will be used to fetch normals instead of requesting from PointSet->GetVertexNormal. Parameterization/MeshLocalParam.h  
ExternalNormalFunc TFunction< FVector3d(int32)> Normals will be requested from this function if bEnableExternalNormals == true Parameterization/MeshLocalParam.h  
ParamMode ELocalParamTypes Type of local parameterization to compute Parameterization/MeshLocalParam.h  
PointSet const PointSetType *   Parameterization/MeshLocalParam.h  

Functions

Public

Name Remarks Include Path Unreal Specifiers

void ApplyUVs ( TFunctionRef< void(int32 PointID, const FVector2d&UV)> ApplyFunc
) const

 Apply a function to each calculated UV Parameterization/MeshLocalParam.h  

void ComputeToMaxDistance ( int32 CenterPointVtxID,
const FFrame3d& CenterPointFrame,
double ComputeToMaxDistanceIn
)

 Computes UVs outwards from seed vertex to all points that are less/equal to ComputeToMaxDistance from the seed. Parameterization/MeshLocalParam.h  

void ComputeToMaxDistance ( const FFrame3d& SeedFrameIn,
const FIndex3i& SeedNbrs,
double ComputeToMaxDistanceIn
)

 Computes UVs outwards from seed frame/nbrs to all points that are less/equal to ComputeToMaxDistance from the seed. Parameterization/MeshLocalParam.h  

void GetAllComputedUVs ( TArray< int32 >& PointIDsOut,
TArray< FVector2d >& PointUVsOut,
double MaxUVMagnitude,
double MaxGraphDist
) const

 Find all computed UVs within the specified distances Parameterization/MeshLocalParam.h  

double GetMaxGraphDistance()

   Parameterization/MeshLocalParam.h  

double GetMaxUVDistance()

   Parameterization/MeshLocalParam.h  

void GetPointsWithUV ( TArray< int32 >& Points
) const

   Parameterization/MeshLocalParam.h  

FVector2d GetUV ( int32 PointID
) const

   Parameterization/MeshLocalParam.h  

FAxisAlignedBox2d GetUVBounds()

   Parameterization/MeshLocalParam.h  

bool HasUV ( int32 PointID
) const

   Parameterization/MeshLocalParam.h  

void Reset()

 Reset internal data structures but keep allocated memory Parameterization/MeshLocalParam.h  

void TransformUV ( double Scale,
FVector2d Translate
)

 Scale and then Translate all calculated UV values Parameterization/MeshLocalParam.h  

Protected

Name Remarks Include Path Unreal Specifiers

FVector2d ComputeLocalUV ( const FFrame3d& Frame,
FVector3d Position
) const

   Parameterization/MeshLocalParam.h  

FFrame3d GetFrame ( const FGraphNode& Node
) const

   Parameterization/MeshLocalParam.h  

const FGraphNode * GetNodeForPointSetID ( int32 PointSetID
) const

   Parameterization/MeshLocalParam.h  

FGraphNode * GetNodeForPointSetID ( int32 PointSetID,
bool bCreateIfMissing
)

   Parameterization/MeshLocalParam.h  

FVector3d GetNormal ( const int32 PointID
) const

   Parameterization/MeshLocalParam.h  

FVector3d GetPosition ( const int32 PointID
) const

   Parameterization/MeshLocalParam.h  

void ProcessQueueUntilTermination ( double MaxDistance
)

   Parameterization/MeshLocalParam.h  

FVector2d PropagateUV ( const FVector3d& Position,
const FVector2d& NbrUV,
const FFrame3d& NbrFrame,
const FFrame3d& SeedFrameIn
) const

 Calculate the UV value at Position based on the existing NbrUV, using the frame at NbrFrame, and the original SeedFrame Parameterization/MeshLocalParam.h  

void UpdateNeighboursSparse ( FGraphNode* Parent
)

 Given new Distance/UV at Parent, check if any of its neighbours are in the queue, and if they are, and the new graph distance is shorter, update their queue position (this is basically the update step of Disjktras algorithm) Parameterization/MeshLocalParam.h  

void UpdateUVExpmap ( FGraphNode& Node
)

   Parameterization/MeshLocalParam.h  

void UpdateUVExpmapUpwind ( FGraphNode& Node
)

   Parameterization/MeshLocalParam.h  

void UpdateUVPlanar ( FGraphNode& Node
)

   Parameterization/MeshLocalParam.h  

Static

Name Remarks Include Path Unreal Specifiers

static FVector2d InvalidUV()

   Parameterization/MeshLocalParam.h  

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