Open CASCADE Technology  6.5.4
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Public Member Functions
BRepCheck_Analyzer Class Reference

A framework to check the overall
validity of a shape. For a shape to be valid in Open
CASCADE, it - or its component subshapes - must respect certain
criteria. These criteria are checked by the function IsValid.
Once you have determined whether a shape is valid or not, you can
diagnose its specific anomalies and correct them using the services of
the ShapeAnalysis, ShapeUpgrade, and ShapeFix packages.

#include <BRepCheck_Analyzer.hxx>

Public Member Functions

DEFINE_STANDARD_ALLOC BRepCheck_Analyzer (const TopoDS_Shape &S, const Standard_Boolean GeomControls=Standard_True)
 Constructs a shape validation object defined by the shape S.
<S> is the shape to control. <GeomControls> If
False only topological informaions are checked.
The geometricals controls are
For a Vertex :
BRepCheck_InvalidToleranceValue NYI
For an Edge :
BRepCheck_InvalidCurveOnClosedSurface,
BRepCheck_InvalidCurveOnSurface,
BRepCheck_InvalidSameParameterFlag,
BRepCheck_InvalidToleranceValue NYI
For a face :
BRepCheck_UnorientableShape,
BRepCheck_IntersectingWires,
BRepCheck_InvalidToleranceValue NYI
For a wire :
BRepCheck_SelfIntersectingWire

void Init (const TopoDS_Shape &S, const Standard_Boolean GeomControls=Standard_True)
 <S> is the shape to control. <GeomControls> If
False only topological informaions are checked.
The geometricals controls are
For a Vertex :
BRepCheck_InvalidTolerance NYI
For an Edge :
BRepCheck_InvalidCurveOnClosedSurface,
BRepCheck_InvalidCurveOnSurface,
BRepCheck_InvalidSameParameterFlag,
BRepCheck_InvalidTolerance NYI
For a face :
BRepCheck_UnorientableShape,
BRepCheck_IntersectingWires,
BRepCheck_InvalidTolerance NYI
For a wire :
BRepCheck_SelfIntersectingWire

Standard_Boolean IsValid (const TopoDS_Shape &S) const
 <S> is a subshape of the original shape. Returns
<STandard_True> if no default has been detected on
<S> and any of its subshape.

Standard_Boolean IsValid () const
 Returns true if no defect is
detected on the shape S or any of its subshapes.
Returns true if the shape S is valid.
This function checks whether a given shape is valid by checking that:

const Handle_BRepCheck_Result & Result (const TopoDS_Shape &SubS) const

Constructor & Destructor Documentation


Member Function Documentation

  • the topology is correct
  • parameterization of edges in particular is correct.
    For the topology to be correct, the following conditions must be satisfied:
  • edges should have at least two vertices if they are not
    degenerate edges. The vertices should be within the range of
    the bounding edges at the tolerance specified in the vertex,
  • edges should share at least one face. The representation of
    the edges should be within the tolerance criterion assigned to them.
  • wires defining a face should not self-intersect and should be closed,
  • there should be one wire which contains all other wires inside a face,
  • wires should be correctly oriented with respect to each of the edges,
  • faces should be correctly oriented, in particular with
    respect to adjacent faces if these faces define a solid,
  • shells defining a solid should be closed. There should
    be one enclosing shell if the shape is a solid;
    To check parameterization of edge, there are 2 approaches depending on
    the edge?s contextual situation.
  • if the edge is either single, or it is in the context
    of a wire or a compound, its parameterization is defined by
    the parameterization of its 3D curve and is considered as valid.
  • If the edge is in the context of a face, it should
    have SameParameter and SameRange flags set to Standard_True. To
    check these flags, you should call the function
    BRep_Tool::SameParameter and BRep_Tool::SameRange for an
    edge. If at least one of these flags is set to Standard_False,
    the edge is considered as invalid without any additional check.
    If the edge is contained by a face, and it has SameParameter and
    SameRange flags set to Standard_True, IsValid checks
    whether representation of the edge on face, in context of which the
    edge is considered, has the same parameterization up to the
    tolerance value coded on the edge. For a given parameter t on the edge
    having C as a 3D curve and one PCurve P on a surface S (base
    surface of the reference face), this checks that |C(t) - S(P(t))|
    is less than or equal to tolerance, where tolerance is the tolerance
    value coded on the edge.
const Handle_BRepCheck_Result& BRepCheck_Analyzer::Result ( const TopoDS_Shape SubS) const

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