0029864: Modeling Algorithms - BRepBndLib::AddClose() returns Empty box for triangulation-only Faces

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Date Submitted

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0029864

Open CASCADE

[OCCT] OCCT:Modeling Algorithms

public

2018-06-13 18:09

2018-06-13 18:21

Reporter

kgv

Assigned To

msv

Priority

normal

Severity

minor

Status

new

Resolution

open

Platform

OS Version

Product Version

[OCCT] 5.2.2

Target Version

[OCCT] 7.4.0*

Fixed in Version

Summary

0029864: Modeling Algorithms - BRepBndLib::AddClose() returns Empty box for triangulation-only Faces

Description

Description of the method BRepBndLib::AddClose() says:
  //! 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.

It is not very clear in which cases this method could/should be used,
but since current implementation completely ignores TopoDS_Face,
it returns an Empty box for triangulation-only Faces (without Edges/Vertices).

It is suggested either fixing this limitation, or improving description of the method.

Steps To Reproduce

pload VISUALIZATION XDE MODELING QAcommands
readstl m [locate_data_file model_stl_045.stl] triangulation
vclear
vinit View1
vdisplay -dispMode 1 m
vfit
vdisplay -dispMode 3 m
# bug 1: AIS_Shape has empty Bounding Box display mode

pload QAcommands
OCC566 m
# bug 2: ** Exception ** 000001ED562566E0 : Standard_ConstructionError: Bnd_Box is void

Issue History
Date Modified	Username	Field	Change
2018-06-13 18:09	kgv	New Issue
2018-06-13 18:09	kgv	Assigned To	=> msv
2018-06-13 18:11	kgv	Relationship added	child of 0028125
2018-06-13 18:21	kgv	Product Version	7.3.0 => 5.2.2

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