0026716: Mesher cannot create a mesh of brep model due to ShapeFix_Wire::FixShifted()

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Category

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Date Submitted

Last Update

0026716

Community

[OCCT] OCCT:Shape Healing

public

2015-09-22 17:18

2017-08-11 13:14

Reporter

Damir Bogrov

Assigned To

gka

Priority

normal

Severity

minor

Status

new

Resolution

open

Platform

OS Version

Product Version

[OCCT] 6.9.0

Target Version

[OCCT] 7.4.0*

Fixed in Version

Summary

0026716: Mesher cannot create a mesh of brep model due to ShapeFix_Wire::FixShifted()

Description

A model obtained after conversion of external file, forms a solid sphere.

The model contains a face which lies on surface of revolution. Basis curve of surface is a trimmed circle. Trim has a domain [-pi/2; pi/2].

Brep checker said that the result model is valid and fixshape does nothing.
But mesher cannot create a mesh.

The root cause is that ShapeFix_Wire::FixShifted() shifts domain of trim to [3pi/2; 5pi/2], but pcurve of edges still forming a rectangle with diagonal corner (0;-pi/2) and (2pi;pi/2).

To address this issue could be to extend FixShifted.

Steps To Reproduce

restore rev.brep m
vinit
vsetdispmode 1
vdisplay m
vfit

Tags

No tags attached.

Test case number

bugs heal bug26716

Attached Files

rev.brep (1,173 bytes) 2015-09-22 17:18

viewer.png (10,484 bytes) 2015-09-22 17:18

Relationships

Notes
(0046245) Damir Bogrov (reporter) 2015-09-29 11:10	The further analysis showed that the root cause is shifts of incoming domain in the constructor of trimmed curve. If set the domain of trim to [-pi/2; pi/2] on the periodic curve with domain [0, 2pi], then the trim actually will be have a domain [3pi/2; 5pi/2]. Therefore trim's domain is inconsistent with pcurve's domain and the mesher cannot create a mesh.

(0069317) mkv (tester) 2017-08-11 13:14	Problem described in issue is reproduced on current state of OCCT.

Issue History
Date Modified	Username	Field	Change
2015-09-22 17:18	Damir Bogrov	New Issue
2015-09-22 17:18	Damir Bogrov	Assigned To	=> gka
2015-09-22 17:18	Damir Bogrov	File Added: rev.brep
2015-09-22 17:18	Damir Bogrov	File Added: viewer.png
2015-09-29 11:10	Damir Bogrov	Note Added: 0046245
2015-11-16 16:59	abv	Target Version	=> 7.1.0
2016-10-26 12:01	gka	Target Version	7.1.0 => 7.2.0
2017-07-27 09:33	abv	Target Version	7.2.0 => 7.4.0*
2017-08-11 13:14	mkv	Test case number	=> bugs heal bug26716
2017-08-11 13:14	mkv	Note Added: 0069317