Poly_Triangulation Class Reference

Provides a triangulation for a surface, a set of surfaces, or more generally a shape. A triangulation consists of an approximate representation of the actual shape, using a collection of points and triangles. The points are located on the surface. The edges of the triangles connect adjacent points with a straight line that approximates the true curve on the surface. A triangulation comprises: More...

`#include <Poly_Triangulation.hxx>`

Inheritance diagram for Poly_Triangulation:
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Public Member Functions

Poly_Triangulation (const Standard_Integer nbNodes, const Standard_Integer nbTriangles, const Standard_Boolean UVNodes)
Constructs a triangulation from a set of triangles. The triangulation is initialized without a triangle or a node, but capable of containing nbNodes nodes, and nbTriangles triangles. Here the UVNodes flag indicates whether 2D nodes will be associated with 3D ones, (i.e. to enable a 2D representation). More...

Poly_Triangulation (const TColgp_Array1OfPnt &Nodes, const Poly_Array1OfTriangle &Triangles)
Constructs a triangulation from a set of triangles. The triangulation is initialized with 3D points from Nodes and triangles from Triangles. More...

Poly_Triangulation (const TColgp_Array1OfPnt &Nodes, const TColgp_Array1OfPnt2d &UVNodes, const Poly_Array1OfTriangle &Triangles)
Constructs a triangulation from a set of triangles. The triangulation is initialized with 3D points from Nodes, 2D points from UVNodes and triangles from Triangles, where coordinates of a 2D point from UVNodes are the (u, v) parameters of the corresponding 3D point from Nodes on the surface approximated by the constructed triangulation. More...

Handle< Poly_TriangulationCopy () const
Creates full copy of current triangulation. More...

Standard_Real Deflection () const
Returns the deflection of this triangulation. More...

void Deflection (const Standard_Real D)
Sets the deflection of this triangulation to D. See more on deflection in Polygon2D. More...

void RemoveUVNodes ()
Deallocates the UV nodes. More...

Standard_Integer NbNodes () const
Returns the number of nodes for this triangulation. Null if the nodes are not yet defined. More...

Standard_Integer NbTriangles () const
Returns the number of triangles for this triangulation. Null if the Triangles are not yet defined. More...

Standard_Boolean HasUVNodes () const
Returns true if 2D nodes are associated with 3D nodes for this triangulation. More...

const TColgp_Array1OfPntNodes () const
Returns the table of 3D nodes (3D points) for this triangulation. More...

TColgp_Array1OfPntChangeNodes ()
Returns the table of 3D nodes (3D points) for this triangulation. The returned array is shared. Therefore if the table is selected by reference, you can, by simply modifying it, directly modify the data structure of this triangulation. More...

const TColgp_Array1OfPnt2dUVNodes () const
Returns the table of 2D nodes (2D points) associated with each 3D node of this triangulation. The function HasUVNodes checks if 2D nodes are associated with the 3D nodes of this triangulation. Const reference on the 2d nodes values. More...

TColgp_Array1OfPnt2dChangeUVNodes ()
Returns the table of 2D nodes (2D points) associated with each 3D node of this triangulation. Function ChangeUVNodes shares the returned array. Therefore if the table is selected by reference, you can, by simply modifying it, directly modify the data structure of this triangulation. More...

const Poly_Array1OfTriangleTriangles () const
Returns the table of triangles for this triangulation. More...

Poly_Array1OfTriangleChangeTriangles ()
Returns the table of triangles for this triangulation. Function ChangeUVNodes shares the returned array. Therefore if the table is selected by reference, you can, by simply modifying it, directly modify the data structure of this triangulation. More...

void SetNormals (const Handle< TShort_HArray1OfShortReal > &theNormals)
Sets the table of node normals. raises exception if length of theNormals != 3*NbNodes. More...

const TShort_Array1OfShortRealNormals () const

TShort_Array1OfShortRealChangeNormals ()

Standard_Boolean HasNormals () const

Public Member Functions inherited from MMgt_TShared
virtual void Delete () const
Memory deallocator for transient classes. More...

Public Member Functions inherited from Standard_Transient
Standard_Transient ()
Empty constructor. More...

Standard_Transient (const Standard_Transient &)
Copy constructor – does nothing. More...

Standard_Transientoperator= (const Standard_Transient &)
Assignment operator, needed to avoid copying reference counter. More...

virtual ~Standard_Transient ()
Destructor must be virtual. More...

virtual const Handle_Standard_Type & DynamicType () const

Standard_Boolean IsInstance (const Handle_Standard_Type &theType) const
Returns a true value if this is an instance of Type. More...

Standard_Boolean IsInstance (const Standard_CString theTypeName) const
Returns a true value if this is an instance of TypeName. More...

Standard_Boolean IsKind (const Handle_Standard_Type &theType) const
Returns true if this is an instance of Type or an instance of any class that inherits from Type. Note that multiple inheritance is not supported by OCCT RTTI mechanism. More...

Standard_Boolean IsKind (const Standard_CString theTypeName) const
Returns true if this is an instance of TypeName or an instance of any class that inherits from TypeName. Note that multiple inheritance is not supported by OCCT RTTI mechanism. More...

virtual Handle_Standard_Transient This () const
Returns a Handle which references this object. Must never be called to objects created in stack. More...

Standard_Integer GetRefCount () const
Get the reference counter of this object. More...

Detailed Description

Provides a triangulation for a surface, a set of surfaces, or more generally a shape. A triangulation consists of an approximate representation of the actual shape, using a collection of points and triangles. The points are located on the surface. The edges of the triangles connect adjacent points with a straight line that approximates the true curve on the surface. A triangulation comprises:

• A table of 3D nodes (3D points on the surface).
• A table of triangles. Each triangle (Poly_Triangle object) comprises a triplet of indices in the table of 3D nodes specific to the triangulation.
• A table of 2D nodes (2D points), parallel to the table of 3D nodes. This table is optional. If it exists, the coordinates of a 2D point are the (u, v) parameters of the corresponding 3D point on the surface approximated by the triangulation.
• A deflection (optional), which maximizes the distance from a point on the surface to the corresponding point on its approximate triangulation. In many cases, algorithms do not need to work with the exact representation of a surface. A triangular representation induces simpler and more robust adjusting, faster performances, and the results are as good. This is a Transient class.

Constructor & Destructor Documentation

 Poly_Triangulation::Poly_Triangulation ( const Standard_Integer nbNodes, const Standard_Integer nbTriangles, const Standard_Boolean UVNodes )

Constructs a triangulation from a set of triangles. The triangulation is initialized without a triangle or a node, but capable of containing nbNodes nodes, and nbTriangles triangles. Here the UVNodes flag indicates whether 2D nodes will be associated with 3D ones, (i.e. to enable a 2D representation).

 Poly_Triangulation::Poly_Triangulation ( const TColgp_Array1OfPnt & Nodes, const Poly_Array1OfTriangle & Triangles )

Constructs a triangulation from a set of triangles. The triangulation is initialized with 3D points from Nodes and triangles from Triangles.

 Poly_Triangulation::Poly_Triangulation ( const TColgp_Array1OfPnt & Nodes, const TColgp_Array1OfPnt2d & UVNodes, const Poly_Array1OfTriangle & Triangles )

Constructs a triangulation from a set of triangles. The triangulation is initialized with 3D points from Nodes, 2D points from UVNodes and triangles from Triangles, where coordinates of a 2D point from UVNodes are the (u, v) parameters of the corresponding 3D point from Nodes on the surface approximated by the constructed triangulation.

Member Function Documentation

 TColgp_Array1OfPnt& Poly_Triangulation::ChangeNodes ( )

Returns the table of 3D nodes (3D points) for this triangulation. The returned array is shared. Therefore if the table is selected by reference, you can, by simply modifying it, directly modify the data structure of this triangulation.

 TShort_Array1OfShortReal& Poly_Triangulation::ChangeNormals ( )
 Poly_Array1OfTriangle& Poly_Triangulation::ChangeTriangles ( )

Returns the table of triangles for this triangulation. Function ChangeUVNodes shares the returned array. Therefore if the table is selected by reference, you can, by simply modifying it, directly modify the data structure of this triangulation.

 TColgp_Array1OfPnt2d& Poly_Triangulation::ChangeUVNodes ( )

Returns the table of 2D nodes (2D points) associated with each 3D node of this triangulation. Function ChangeUVNodes shares the returned array. Therefore if the table is selected by reference, you can, by simply modifying it, directly modify the data structure of this triangulation.

 Handle< Poly_Triangulation > Poly_Triangulation::Copy ( ) const

Creates full copy of current triangulation.

 Standard_Real Poly_Triangulation::Deflection ( ) const

Returns the deflection of this triangulation.

 void Poly_Triangulation::Deflection ( const Standard_Real D )

Sets the deflection of this triangulation to D. See more on deflection in Polygon2D.

 Standard_Boolean Poly_Triangulation::HasNormals ( ) const
 Standard_Boolean Poly_Triangulation::HasUVNodes ( ) const

Returns true if 2D nodes are associated with 3D nodes for this triangulation.

 Standard_Integer Poly_Triangulation::NbNodes ( ) const

Returns the number of nodes for this triangulation. Null if the nodes are not yet defined.

 Standard_Integer Poly_Triangulation::NbTriangles ( ) const

Returns the number of triangles for this triangulation. Null if the Triangles are not yet defined.

 const TColgp_Array1OfPnt& Poly_Triangulation::Nodes ( ) const

Returns the table of 3D nodes (3D points) for this triangulation.

 const TShort_Array1OfShortReal& Poly_Triangulation::Normals ( ) const
 void Poly_Triangulation::RemoveUVNodes ( )

Deallocates the UV nodes.

 void Poly_Triangulation::SetNormals ( const Handle< TShort_HArray1OfShortReal > & theNormals )

Sets the table of node normals. raises exception if length of theNormals != 3*NbNodes.

 const Poly_Array1OfTriangle& Poly_Triangulation::Triangles ( ) const

Returns the table of triangles for this triangulation.

 const TColgp_Array1OfPnt2d& Poly_Triangulation::UVNodes ( ) const

Returns the table of 2D nodes (2D points) associated with each 3D node of this triangulation. The function HasUVNodes checks if 2D nodes are associated with the 3D nodes of this triangulation. Const reference on the 2d nodes values.

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