Open CASCADE Technology
6.5.4
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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:
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#include <Poly_Triangulation.hxx>
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). | |
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 (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. | |
Standard_Real | Deflection () const |
Returns the deflection of this triangulation. | |
void | Deflection (const Standard_Real D) |
Sets the deflection of this triangulation to D. See more on deflection in Polygon2D | |
void | RemoveUVNodes () |
Deallocates the UV nodes. | |
Standard_Integer | NbNodes () const |
Returns the number of nodes for this triangulation. Null if the nodes are not yet defined. | |
Standard_Integer | NbTriangles () const |
Returns the number of triangles for this triangulation. Null if the Triangles are not yet defined. | |
Standard_Boolean | HasUVNodes () const |
Returns true if 2D nodes are associated with 3D nodes for this triangulation. | |
const TColgp_Array1OfPnt & | Nodes () const |
Returns the table of 3D nodes (3D points) for this triangulation. | |
TColgp_Array1OfPnt & | 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. | |
const TColgp_Array1OfPnt2d & | 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. | |
TColgp_Array1OfPnt2d & | 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. | |
const Poly_Array1OfTriangle & | Triangles () const |
Returns the table of triangles for this triangulation. | |
Poly_Array1OfTriangle & | 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. | |
void | SetNormals (const Handle< TShort_HArray1OfShortReal > &theNormals) |
Sets the table of node normals. raises exception if length of theNormals != 3*NbNodes | |
const TShort_Array1OfShortReal & | Normals () const |
TShort_Array1OfShortReal & | ChangeNormals () |
Standard_Boolean | HasNormals () const |
Poly_Triangulation::Poly_Triangulation | ( | const Standard_Integer | nbNodes, |
const Standard_Integer | nbTriangles, | ||
const Standard_Boolean | UVNodes | ||
) |
Poly_Triangulation::Poly_Triangulation | ( | const TColgp_Array1OfPnt & | Nodes, |
const Poly_Array1OfTriangle & | Triangles | ||
) |
Poly_Triangulation::Poly_Triangulation | ( | const TColgp_Array1OfPnt & | Nodes, |
const TColgp_Array1OfPnt2d & | UVNodes, | ||
const Poly_Array1OfTriangle & | Triangles | ||
) |
Standard_Real Poly_Triangulation::Deflection | ( | ) | const |
Standard_Integer Poly_Triangulation::NbNodes | ( | ) | const |
const TColgp_Array1OfPnt& Poly_Triangulation::Nodes | ( | ) | const |
void Poly_Triangulation::SetNormals | ( | const Handle< TShort_HArray1OfShortReal > & | theNormals | ) |
const TColgp_Array1OfPnt2d& Poly_Triangulation::UVNodes | ( | ) | const |