0024185: Modeling Algorithms - Wrong projection of a wire to a face

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Date Submitted

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0024185

Community

[OCCT] OCCT:Modeling Algorithms

public

2013-09-17 14:43

2021-06-01 17:33

Reporter

Vitezslav Zajic

Assigned To

abulychev-ext

Priority

normal

Severity

major

Status

new

Resolution

open

Platform

Windows

VC++ 2010

OS Version

32 bit

Product Version

[OCCT] 6.6.0

Target Version

Fixed in Version

Summary

0024185: Modeling Algorithms - Wrong projection of a wire to a face

Description

OpenCascade gives a wrong projection of the wire to the face1 (see attached files). The wire was constructed as an intersection between face1 and face2 and then smoothed by Approx_Curve3d. Both faces are attached, so you can compare the wire to the intersection of the faces yourself.

Steps To Reproduce

Draw script:

restore face1.brep f1
restore wire.brep w
nproject r w f1

You can compare the wire in wire.brep to the intersection of the two faces:

restore face2.brep f2
section s f1 f2

Tags

No tags attached.

Test case number

bugs modalg_7 bug24185

Attached Files

wire.brep (10,280 bytes) 2013-09-17 14:43

face1.brep (1,235 bytes) 2013-09-17 14:44

face2.brep (2,600 bytes) 2013-09-17 14:44

Relationships

related to

0030090

closed

bugmaster

Open CASCADE

Modeling Algorithms - BRepLib::FindValidRange does not find valid range for the edge

Notes
(0026292) Vitezslav Zajic (reporter) 2013-10-25 19:00	The bug seems to be caused by numerical instability when approximating the projection by a bspline curve. If you increase allowed number of poles of the bspline curve and/or increase precision, the projection looks fine: nproject r w f1 0.0005 C0 14 1000 This is not so surprising, but maybe default precision/number of poles is too large or small, respectively? Even with few poles, could the approximation be more stable?

(0068677) apv (tester) 2017-07-25 14:53	Problem described in issue is reproduced on current state of OCCT

(0068678) git (administrator) 2017-07-25 14:57	Branch CR24185 has been created by apv. SHA-1: 5fb9e6a42158c6f780f0c552dc605f6181c115fb Detailed log of new commits: Author: apv Date: Tue Jul 25 14:56:37 2017 +0300 Test for 0024185: Wrong projection of a wire to a face

Issue History
Date Modified	Username	Field	Change
2013-09-17 14:43	Vitezslav Zajic	New Issue
2013-09-17 14:43	Vitezslav Zajic	Assigned To	=> ifv
2013-09-17 14:43	Vitezslav Zajic	File Added: wire.brep
2013-09-17 14:44	Vitezslav Zajic	File Added: face1.brep
2013-09-17 14:44	Vitezslav Zajic	File Added: face2.brep
2013-10-25 19:00	Vitezslav Zajic	Note Added: 0026292
2017-07-25 14:53	apv	Note Added: 0068677
2017-07-25 14:54	apv	Test case number	=> bugs modalg_7 bug24185
2017-07-25 14:57	git	Note Added: 0068678
2018-08-28 11:35	emv	Relationship added	related to 0030090
2021-06-01 17:28	ifv	Assigned To	ifv => abulychev-ext
2021-06-01 17:33	kgv	Summary	Wrong projection of a wire to a face => Modeling Algorithms - Wrong projection of a wire to a face
2021-06-01 17:33	kgv	Steps to Reproduce Updated	View Revisions