0031641: IntCurvesFace_ShapeIntersector incorrect result

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Date Submitted

Last Update

0031641

Community

[OCCT] OCCT:Modeling Algorithms

public

2020-06-29 11:22

2020-09-15 09:56

Reporter

mat127

Assigned To

akulagin

Priority

normal

Severity

major

Status

new

Resolution

open

Platform

Linux 64bit

Fedora Core

OS Version

Product Version

[OCCT] 7.3.0

Target Version

Fixed in Version

Summary

0031641: IntCurvesFace_ShapeIntersector incorrect result

Description

There is a shape stored in the attached shape.brep file. IntCurvesFace_ShapeIntersector gives an icorrect results for checking intersections of this shape with lines parallel to the Z axis at particular (x,y) directions.

The application oputput is:

[(0.839, -4.675, -1.555), (0, 0, 1)]
  (0.839, -4.675, 0): out
  (0.839, -4.675, 0): in
  (0.839, -4.675, 1.5): out
[(2.304, -3.40779, -1.555), (0, 0, 1)]
  (2.304, -3.40779, 0): out

Line definition [(location),(direction)] is followed by an intended list of intersection points and their transitions in the form (intersection location): transition.

In both cases the first intersection point having the transition 'out' is errorneous. It means that the line for z < 0 is inside the shape which is not true.

Steps To Reproduce

Compile and run the attached .cxx file and check the output according to the description. Note that the application needs the provided shape.brep file being placed in the same directory as the application binary.

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Test case number

Attached Files

intersector.cxx (2,622 bytes) 2020-06-29 11:22

shape.brep (590,377 bytes) 2020-06-29 11:23

intersector2.cxx (2,389 bytes) 2020-09-10 16:55

shape2.brep (1,819,036 bytes) 2020-09-10 16:55

intersector3.cxx (2,402 bytes) 2020-09-10 17:01

Relationships

Notes
(0094389) mat127 (reporter) 2020-09-10 17:05	Similar issue observed for the shape2.brep shape. Compile and run the intersector3.cxx (please ignore intersector2.cxx) and check the output: [(0.801494, -3.855, 1.88088), (0, 1, 0)] (0.801494, -3.855, 1.88088): in (0.801494, 3.855, 1.88088): out This looks like a valid output signaling that the line is inside the shape for -3.855 < y < 3.855. But it is not true. The line just touches the shape at both intersection points.

Issue History
Date Modified	Username	Field	Change
2020-06-29 11:22	mat127	New Issue
2020-06-29 11:22	mat127	Assigned To	=> msv
2020-06-29 11:22	mat127	File Added: intersector.cxx
2020-06-29 11:23	mat127	File Added: shape.brep
2020-09-10 16:55	mat127	File Added: intersector2.cxx
2020-09-10 16:55	mat127	File Added: shape2.brep
2020-09-10 17:01	mat127	File Added: intersector3.cxx
2020-09-10 17:05	mat127	Note Added: 0094389
2020-09-14 09:52	msv	Assigned To	msv => ifv
2020-09-15 09:56	ifv	Assigned To	ifv => akulagin