Open CASCADE Technology  6.5.4
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Static Public Member Functions
BRepBndLib Class Reference

This package provides the bounding boxes for curves
and surfaces from BRepAdaptor.
Functions to add a topological shape to a bounding box

#include <BRepBndLib.hxx>

Static Public Member Functions

static DEFINE_STANDARD_ALLOC void Add (const TopoDS_Shape &S, Bnd_Box &B, const Standard_Boolean useTriangulation=Standard_True)
 Adds the shape S to the bounding box B.
More precisely are successively added to B:

static void AddClose (const TopoDS_Shape &S, Bnd_Box &B)
 Adds the shape S to the bounding box B.
This is a quick algorithm but only works if the shape S is
composed of polygonal planar faces, as is the case if S is
an approached polyhedral representation of an exact
shape. Pay particular attention to this because this
condition is not checked and, if it not respected, an error
may occur in the algorithm for which the bounding box is built.
Note that the resulting bounding box is not enlarged by the
tolerance value of the sub-shapes as is the case with the
Add function. So the added part of the resulting bounding
box is closer to the shape S.


Member Function Documentation

static DEFINE_STANDARD_ALLOC void BRepBndLib::Add ( const TopoDS_Shape S,
Bnd_Box B,
const Standard_Boolean  useTriangulation = Standard_True 
) [static]
  • each face of S; the triangulation of the face is used if it exists,
  • then each edge of S which does not belong to a face,
    the polygon of the edge is used if it exists
  • and last each vertex of S which does not belong to an edge.
    After each elementary operation, the bounding box B is
    enlarged by the tolerance value of the relative sub-shape.
    When working with the triangulation of a face this value of
    enlargement is the sum of the triangulation deflection and
    the face tolerance. When working with the
    polygon of an edge this value of enlargement is
    the sum of the polygon deflection and the edge tolerance.
    Warning
  • This algorithm is time consuming if triangulation has not
    been inserted inside the data structure of the shape S.
  • The resulting bounding box may be somewhat larger than the object.
static void BRepBndLib::AddClose ( const TopoDS_Shape S,
Bnd_Box B 
) [static]

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