vtkPolyDataNormals Class Reference

#include <vtkPolyDataNormals.h>

Inheritance diagram for vtkPolyDataNormals:

[legend]Collaboration diagram for vtkPolyDataNormals:

[legend]List of all members.

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Detailed Description

compute normals for polygonal mesh

vtkPolyDataNormals is a filter that computes point normals for a polygonal mesh. The filter can reorder polygons to insure consistent orientation across polygon neighbors. Sharp edges can be split and points duplicated with separate normals to give crisp (rendered) surface definition. It is also possible to globally flip the normal orientation.

The algorithm works by determining normals for each polygon and then averaging them at shared points. When sharp edges are present, the edges are split and new points generated to prevent blurry edges (due to Gouraud shading).

Warning:

Normals are computed only for polygons and triangle strips. Normals are not computed for lines or vertices.

Triangle strips are broken up into triangle polygons. You may want to restrip the triangles.

Examples:

vtkPolyDataNormals (Examples)

Tests:

vtkPolyDataNormals (Tests)

Definition at line 53 of file vtkPolyDataNormals.h.

virtual void	SetFeatureAngle (double)
virtual double	GetFeatureAngle ()
static vtkPolyDataNormals *	New ()
Public Types
typedef vtkPolyDataAlgorithm	Superclass
Public Member Functions
virtual const char *	GetClassName ()
virtual int	IsA (const char *type)
void	PrintSelf (ostream &os, vtkIndent indent)
virtual void	SetSplitting (int)
virtual int	GetSplitting ()
virtual void	SplittingOn ()
virtual void	SplittingOff ()
virtual void	SetConsistency (int)
virtual int	GetConsistency ()
virtual void	ConsistencyOn ()
virtual void	ConsistencyOff ()
virtual void	SetAutoOrientNormals (int)
virtual int	GetAutoOrientNormals ()
virtual void	AutoOrientNormalsOn ()
virtual void	AutoOrientNormalsOff ()
virtual void	SetComputePointNormals (int)
virtual int	GetComputePointNormals ()
virtual void	ComputePointNormalsOn ()
virtual void	ComputePointNormalsOff ()
virtual void	SetComputeCellNormals (int)
virtual int	GetComputeCellNormals ()
virtual void	ComputeCellNormalsOn ()
virtual void	ComputeCellNormalsOff ()
virtual void	SetFlipNormals (int)
virtual int	GetFlipNormals ()
virtual void	FlipNormalsOn ()
virtual void	FlipNormalsOff ()
virtual void	SetNonManifoldTraversal (int)
virtual int	GetNonManifoldTraversal ()
virtual void	NonManifoldTraversalOn ()
virtual void	NonManifoldTraversalOff ()
Static Public Member Functions
static int	IsTypeOf (const char *type)
static vtkPolyDataNormals *	SafeDownCast (vtkObject *o)
Protected Member Functions
	vtkPolyDataNormals ()
	~vtkPolyDataNormals ()
int	RequestData (vtkInformation *, vtkInformationVector **, vtkInformationVector *)
Protected Attributes
double	FeatureAngle
int	Splitting
int	Consistency
int	FlipNormals
int	AutoOrientNormals
int	NonManifoldTraversal
int	ComputePointNormals
int	ComputeCellNormals
int	NumFlips

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Member Typedef Documentation

typedef vtkPolyDataAlgorithm vtkPolyDataNormals::Superclass

Reimplemented from vtkPolyDataAlgorithm. Reimplemented in vtkPPolyDataNormals. Definition at line 56 of file vtkPolyDataNormals.h.

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Constructor & Destructor Documentation

vtkPolyDataNormals::vtkPolyDataNormals (   )  [protected]

vtkPolyDataNormals::~vtkPolyDataNormals (   )  [inline, protected]

Definition at line 135 of file vtkPolyDataNormals.h.

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Member Function Documentation

virtual const char* vtkPolyDataNormals::GetClassName (   )  [virtual]

Reimplemented from vtkPolyDataAlgorithm. Reimplemented in vtkPPolyDataNormals.

static int vtkPolyDataNormals::IsTypeOf (  const char *  type  )  [static]

Return 1 if this class type is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeRevisionMacro found in vtkSetGet.h. Reimplemented from vtkPolyDataAlgorithm. Reimplemented in vtkPPolyDataNormals.

virtual int vtkPolyDataNormals::IsA (  const char *  type  )  [virtual]

Return 1 if this class is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeRevisionMacro found in vtkSetGet.h. Reimplemented from vtkPolyDataAlgorithm. Reimplemented in vtkPPolyDataNormals.

static vtkPolyDataNormals* vtkPolyDataNormals::SafeDownCast (  vtkObject *  o  )  [static]

Reimplemented from vtkPolyDataAlgorithm. Reimplemented in vtkPPolyDataNormals.

void vtkPolyDataNormals::PrintSelf (  ostream &  os, vtkIndent  indent )  [virtual]

Methods invoked by print to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes. Reimplemented from vtkPolyDataAlgorithm. Reimplemented in vtkPPolyDataNormals.

static vtkPolyDataNormals* vtkPolyDataNormals::New (   )  [static]

Construct with feature angle=30, splitting and consistency turned on, flipNormals turned off, and non-manifold traversal turned on. ComputePointNormals is on and ComputeCellNormals is off. Reimplemented from vtkPolyDataAlgorithm. Reimplemented in vtkPPolyDataNormals.

virtual void vtkPolyDataNormals::SetFeatureAngle (  double   )  [virtual]

Specify the angle that defines a sharp edge. If the difference in angle across neighboring polygons is greater than this value, the shared edge is considered "sharp".

virtual double vtkPolyDataNormals::GetFeatureAngle (   )  [virtual]

Specify the angle that defines a sharp edge. If the difference in angle across neighboring polygons is greater than this value, the shared edge is considered "sharp".

virtual void vtkPolyDataNormals::SetSplitting (  int   )  [virtual]

Turn on/off the splitting of sharp edges.

virtual int vtkPolyDataNormals::GetSplitting (   )  [virtual]

Turn on/off the splitting of sharp edges.

virtual void vtkPolyDataNormals::SplittingOn (   )  [virtual]

Turn on/off the splitting of sharp edges.

virtual void vtkPolyDataNormals::SplittingOff (   )  [virtual]

Turn on/off the splitting of sharp edges.

virtual void vtkPolyDataNormals::SetConsistency (  int   )  [virtual]

Turn on/off the enforcement of consistent polygon ordering.

virtual int vtkPolyDataNormals::GetConsistency (   )  [virtual]

Turn on/off the enforcement of consistent polygon ordering.

virtual void vtkPolyDataNormals::ConsistencyOn (   )  [virtual]

Turn on/off the enforcement of consistent polygon ordering.

virtual void vtkPolyDataNormals::ConsistencyOff (   )  [virtual]

Turn on/off the enforcement of consistent polygon ordering.

virtual void vtkPolyDataNormals::SetAutoOrientNormals (  int   )  [virtual]

Turn on/off the automatic determination of correct normal orientation. NOTE: This assumes a completely closed surface (i.e. no boundary edges) and no non-manifold edges. If these constraints do not hold, all bets are off. This option adds some computational complexity, and is useful if you don't want to have to inspect the rendered image to determine whether to turn on the FlipNormals flag. However, this flag can work with the FlipNormals flag, and if both are set, all the normals in the output will point "inward".

virtual int vtkPolyDataNormals::GetAutoOrientNormals (   )  [virtual]

Turn on/off the automatic determination of correct normal orientation. NOTE: This assumes a completely closed surface (i.e. no boundary edges) and no non-manifold edges. If these constraints do not hold, all bets are off. This option adds some computational complexity, and is useful if you don't want to have to inspect the rendered image to determine whether to turn on the FlipNormals flag. However, this flag can work with the FlipNormals flag, and if both are set, all the normals in the output will point "inward".

virtual void vtkPolyDataNormals::AutoOrientNormalsOn (   )  [virtual]

Turn on/off the automatic determination of correct normal orientation. NOTE: This assumes a completely closed surface (i.e. no boundary edges) and no non-manifold edges. If these constraints do not hold, all bets are off. This option adds some computational complexity, and is useful if you don't want to have to inspect the rendered image to determine whether to turn on the FlipNormals flag. However, this flag can work with the FlipNormals flag, and if both are set, all the normals in the output will point "inward".

virtual void vtkPolyDataNormals::AutoOrientNormalsOff (   )  [virtual]

Turn on/off the automatic determination of correct normal orientation. NOTE: This assumes a completely closed surface (i.e. no boundary edges) and no non-manifold edges. If these constraints do not hold, all bets are off. This option adds some computational complexity, and is useful if you don't want to have to inspect the rendered image to determine whether to turn on the FlipNormals flag. However, this flag can work with the FlipNormals flag, and if both are set, all the normals in the output will point "inward".

virtual void vtkPolyDataNormals::SetComputePointNormals (  int   )  [virtual]

Turn on/off the computation of point normals.

virtual int vtkPolyDataNormals::GetComputePointNormals (   )  [virtual]

Turn on/off the computation of point normals.

virtual void vtkPolyDataNormals::ComputePointNormalsOn (   )  [virtual]

Turn on/off the computation of point normals.

virtual void vtkPolyDataNormals::ComputePointNormalsOff (   )  [virtual]

Turn on/off the computation of point normals.

virtual void vtkPolyDataNormals::SetComputeCellNormals (  int   )  [virtual]

Turn on/off the computation of cell normals.

virtual int vtkPolyDataNormals::GetComputeCellNormals (   )  [virtual]

Turn on/off the computation of cell normals.

virtual void vtkPolyDataNormals::ComputeCellNormalsOn (   )  [virtual]

Turn on/off the computation of cell normals.

virtual void vtkPolyDataNormals::ComputeCellNormalsOff (   )  [virtual]

Turn on/off the computation of cell normals.

virtual void vtkPolyDataNormals::SetFlipNormals (  int   )  [virtual]

Turn on/off the global flipping of normal orientation. Flipping reverves the meaning of front and back for Frontface and Backface culling in vtkProperty. Flipping modifies both the normal direction and the order of a cell's points.

virtual int vtkPolyDataNormals::GetFlipNormals (   )  [virtual]

Turn on/off the global flipping of normal orientation. Flipping reverves the meaning of front and back for Frontface and Backface culling in vtkProperty. Flipping modifies both the normal direction and the order of a cell's points.

virtual void vtkPolyDataNormals::FlipNormalsOn (   )  [virtual]

Turn on/off the global flipping of normal orientation. Flipping reverves the meaning of front and back for Frontface and Backface culling in vtkProperty. Flipping modifies both the normal direction and the order of a cell's points.

virtual void vtkPolyDataNormals::FlipNormalsOff (   )  [virtual]

Turn on/off the global flipping of normal orientation. Flipping reverves the meaning of front and back for Frontface and Backface culling in vtkProperty. Flipping modifies both the normal direction and the order of a cell's points.

virtual void vtkPolyDataNormals::SetNonManifoldTraversal (  int   )  [virtual]

Turn on/off traversal across non-manifold edges. This will prevent problems where the consistency of polygonal ordering is corrupted due to topological loops.

virtual int vtkPolyDataNormals::GetNonManifoldTraversal (   )  [virtual]

Turn on/off traversal across non-manifold edges. This will prevent problems where the consistency of polygonal ordering is corrupted due to topological loops.

virtual void vtkPolyDataNormals::NonManifoldTraversalOn (   )  [virtual]

Turn on/off traversal across non-manifold edges. This will prevent problems where the consistency of polygonal ordering is corrupted due to topological loops.

virtual void vtkPolyDataNormals::NonManifoldTraversalOff (   )  [virtual]

Turn on/off traversal across non-manifold edges. This will prevent problems where the consistency of polygonal ordering is corrupted due to topological loops.

int vtkPolyDataNormals::RequestData (  vtkInformation *  , vtkInformationVector **  , vtkInformationVector *  )  [protected, virtual]

This is called by the superclass. This is the method you should override. Reimplemented from vtkPolyDataAlgorithm. Reimplemented in vtkPPolyDataNormals.

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Member Data Documentation

double vtkPolyDataNormals::FeatureAngle [protected]

Definition at line 140 of file vtkPolyDataNormals.h.

int vtkPolyDataNormals::Splitting [protected]

Definition at line 141 of file vtkPolyDataNormals.h.

int vtkPolyDataNormals::Consistency [protected]

Definition at line 142 of file vtkPolyDataNormals.h.

int vtkPolyDataNormals::FlipNormals [protected]

Definition at line 143 of file vtkPolyDataNormals.h.

int vtkPolyDataNormals::AutoOrientNormals [protected]

Definition at line 144 of file vtkPolyDataNormals.h.

int vtkPolyDataNormals::NonManifoldTraversal [protected]

Definition at line 145 of file vtkPolyDataNormals.h.

int vtkPolyDataNormals::ComputePointNormals [protected]

Definition at line 146 of file vtkPolyDataNormals.h.

int vtkPolyDataNormals::ComputeCellNormals [protected]

Definition at line 147 of file vtkPolyDataNormals.h.

int vtkPolyDataNormals::NumFlips [protected]

Definition at line 148 of file vtkPolyDataNormals.h.

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The documentation for this class was generated from the following file:

• dox/Graphics/vtkPolyDataNormals.h

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