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TMeshTangents

[TMeshTangents](API\Runtime\GeometryCore\DynamicMesh\TMeshTangents) is a utility class that can calculate and store various types of tangent vectors for a FDynamicMesh.

API > API/Runtime > API/Runtime/GeometryCore > API/Runtime/GeometryCore/DynamicMesh

References

   
Module GeometryCore
Header /Engine/Source/Runtime/GeometryCore/Public/DynamicMesh/MeshTangents.h
Include #include "DynamicMesh/MeshTangents.h"

Syntax

template<typename RealType>  
class TMeshTangents

Remarks

TMeshTangents is a utility class that can calculate and store various types of tangent vectors for a FDynamicMesh.

Variables

  Type Name Description
Protected variable TArray< int32 > AllDegenerateTris Indices of degenerate triangles.
Protected variable TArray< TVector< RealType > > Bitangents Set of computed bitangents
Protected variable const FDynamicMesh3 * Mesh Target Mesh
Protected variable TArray< TVector< RealType > > Tangents Set of computed tangents

Constructors

  Type Name Description
Public function    
Public function  

TMeshTangents ( const FDynamicMesh3* Mesh
)

  

Functions

  Type Name Description
Public function Static bool Convenience function to compute tangents from the mesh attribute set's primary UVs and normals
Protected function void

ComputeMikkTStyleTangents ( const FDynamicMeshNormalOverlay* NormalOverlay,
const FDynamicMeshUVOverlay* UVOverlay,
const FComputeTangentsOptions& Options
)

 Calculate MikkT-space-style tangents.
Protected function void Calculate per-triangle tangents and then projected to overlay normals at each triangle-vertex
Public function void

ComputeTriangleTangents ( const FDynamicMeshUVOverlay* UVOverlay,
bool bOrthogonalize
)

 Compute per-triangle tangents for the given UV Overlay
Public function void

ComputeTriVertexTangents ( const FDynamicMeshNormalOverlay* NormalOverlay,
const FDynamicMeshUVOverlay* UVOverlay,
const FComputeTangentsOptions& Options
)

 Calculate per-triangle tangent spaces based on the given per-triangle normal and UV overlays.
Public function Const bool

CopyToOverlays ( FDynamicMesh3& MeshToSet
)

 Set Tangents on mesh overlays
Public function bool

CopyTriVertexTangents ( const FDynamicMesh3& SourceMesh
)

 Initialize Tangents from the FDynamicMeshAttributeSet of SourceMesh
Public function void

CopyTriVertexTangents ( const TMeshTangents< OtherRealType >& OtherTangents
)

 Initialize Tangents from other Tangents set
Public function Const const TArray< TVector< RealType > > &  
Public function Const const TArray< int32 > &  
Public function Const void

GetInterpolatedTriangleTangent ( int32 TriangleID,
const UE::Math::TVector< RealType >& BaryCoords,
UE::Math::TVector< RealType >& TangentOut,
UE::Math::TVector< RealType >& BitangentOut
)

  
Public function Const void

GetPerTriangleTangent ( int32 TriangleID,
int32 TriVertIdx,
VectorType& TangentOut,
VectorType& BitangentOut
)

 Return tangent and bitangent at a vertex of triangle for per-triangle computed tangents
Public function Const void

GetPerTriangleTangent ( int32 TriangleID,
int32 TriVertIdx,
UE::Math::TVector< RealType >& TangentOut,
UE::Math::TVector< RealType >& BitangentOut
)

 Return tangent and bitangent at a vertex of triangle for per-triangle computed tangents
Public function Const const TArray< TVector< RealType > > &  
Public function Const void

GetTriangleVertexTangentVectors ( int32 TriangleID,
int32 TriVertexIndex,
OtherVectorType& TangentOut,
OtherVectorType& BitangentOut
)

 Get tangent and bitangent at a vertex of a triangle for per-triangle computed tangents
Public function void

InitializeTriangleTangents ( bool bClearToZero
)

 Per-Triangle Tangents Number of Tangents is NumTrianglesInitialize buffer sizes to one tangent/bitangent per mesh triangle
Public function void

InitializeTriVertexTangents ( bool bClearToZero
)

 Per-Triangle-Vertex Tangents Number of Tangents is NumTriangles * 3 Set internal buffer sizes suitable for calculating per-triangle tangents.
Public function void

SetMesh ( const FDynamicMesh3* MeshIn
)

  
Public function void

SetPerTriangleTangent ( int TriangleID,
int TriVertIdx,
const TVector< RealType >& Tangent,
const TVector< RealType >& Bitangent
)

 Set tangent and bitangent at a vertex of triangle for per-triangle computed tangents.
Protected function void

SetTangentCount ( int Count,
bool bClearToZero
)

 Set the size of the Tangents array to Count, and optionally clear all values to (0,0,0)

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