#include <itkNormalQuadEdgeMeshFilter.h>

Inheritance diagram for itk::NormalQuadEdgeMeshFilter< TInputMesh, TOutputMesh >:

Collaboration diagram for itk::NormalQuadEdgeMeshFilter< TInputMesh, TOutputMesh >:

Public Types
typedef SmartPointer< const Self >	ConstPointer
typedef InputMeshType::Pointer	InputMeshPointer
typedef TInputMesh	InputMeshType
typedef InputMeshType::PointIdentifier	InputPointIdentifier
typedef InputMeshType::PointType	InputPointType
typedef InputMeshType::QEType	InputQEType
typedef InputMeshType::VectorType	InputVectorType
typedef OutputMeshType::CellAutoPointer	OutputCellAutoPointer
typedef OutputMeshType::CellDataContainer	OutputCellDataContainer
typedef OutputMeshType::CellIdentifier	OutputCellIdentifier
typedef OutputMeshType::CellsContainerConstIterator	OutputCellsContainerConstIterator
typedef OutputMeshType::CellsContainerConstIterator	OutputCellsContainerPointer
typedef OutputMeshType::CellType	OutputCellType
typedef OutputFaceNormalType::ValueType	OutputFaceNormalComponentType
typedef OutputMeshTraits::CellPixelType	OutputFaceNormalType
typedef OutputMeshType::Pointer	OutputMeshPointer
typedef OutputMeshType::MeshTraits	OutputMeshTraits
typedef TOutputMesh	OutputMeshType
typedef OutputMeshType::PointDataContainer	OutputPointDataContainer
typedef OutputMeshType::PointIdentifier	OutputPointIdentifier
typedef OutputMeshType::PointIdIterator	OutputPointIdIterator
typedef OutputMeshType::PointsContainerIterator	OutputPointsContainerIterator
typedef OutputMeshType::PointsContainerPointer	OutputPointsContainerPointer
typedef OutputMeshType::PointType	OutputPointType
typedef OutputPolygonType::SelfAutoPointer	OutputPolygonAutoPointer
typedef QuadEdgeMeshPolygonCell < OutputCellType >	OutputPolygonType
typedef OutputMeshType::QEType	OutputQEType
typedef OutputPointType::VectorType	OutputVectorType
typedef OutputVertexNormalType::ValueType	OutputVertexNormalComponentType
typedef OutputMeshTraits::PixelType	OutputVertexNormalType
typedef SmartPointer< Self >	Pointer
typedef NormalQuadEdgeMeshFilter	Self
typedef QuadEdgeMeshToQuadEdgeMeshFilter < TInputMesh, TOutputMesh >	Superclass
typedef TriangleHelper < OutputPointType >	TriangleType
enum	WeightType { GOURAUD = 0, THURMER, AREA }
Public Member Functions
virtual ::itk::LightObject::Pointer	CreateAnother (void) const
virtual const char *	GetNameOfClass () const
virtual WeightType	GetWeight () const
virtual void	SetWeight (WeightType _arg)
Static Public Member Functions
static Pointer	New ()
Protected Member Functions
void	ComputeAllFaceNormals ()
void	ComputeAllVertexNormals ()
OutputFaceNormalType	ComputeFaceNormal (OutputPolygonType *iPoly)
OutputVertexNormalType	ComputeVertexNormal (const OutputPointIdentifier &iId)
void	GenerateData ()
	NormalQuadEdgeMeshFilter ()
void	PrintSelf (std::ostream &os, Indent indent) const
OutputVertexNormalComponentType	Weight (const OutputPointIdentifier &iPId, const OutputCellIdentifier &iCId)
	~NormalQuadEdgeMeshFilter ()
Protected Attributes
WeightType	m_Weight
Private Member Functions
	NormalQuadEdgeMeshFilter (const Self &)
void	operator= (const Self &)

Detailed Description

template<class TInputMesh, class TOutputMesh>
class itk::NormalQuadEdgeMeshFilter< TInputMesh, TOutputMesh >

Filter which computes normals to faces and vertices and store it in the output mesh. Normals to face are first computed, then normals to vertices are computed as linear combination of neighbor face normals, i.e.

$n_v = \frac{\sum_{i=0}^{N_f} \omega_i \cdot n_i}{\| \sum_{k=0}^{N_f} \omega_x \cdot n_k\|}$

.

The difference between each method relies in the definition of the weight $\omega_i$ that you can specify by the method SetWeight.

GOURAUD $\omega_i = 1$ [1]
THURMER $\omega_i =$ Angle of the considered triangle at the given vertex} [2]
AREA $\omega_i = Area(t_i)$ [3]

These weights are defined in the literature:

[1] Henri Gouraud. Continuous shading of curved surfaces. IEEE Transaction on Computers, 20(6):623-629, 1971
[2] Shuangshuang Jin, Robert R. Lewis, and David West. A comparison of algorithms for vertex normal computation. The Visual Computer, 21(1-2):71-82, 2005.
[3] Grit Thurmer and Charles A. Wuthrich. Computing vertex normals from polygonal facets. Journal of Graphic Tools, 3(1):43-46, 1998.

Note:: By default the weight is set to the TURMER weight.

Todo:: Fix run-time issues regarding the difference between the Traits of TInputMesh and the one of TOutputMesh. Right now, it only works if TInputMesh::MeshTraits == TOutputMesh::MeshTraits (and of course it requires that the output have some itk::Vector for point data and cell data.

Definition at line 68 of file itkNormalQuadEdgeMeshFilter.h.