0028640: BRepBuilderAPI_Transform build invalid shape - MantisBT

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ID

Project

Category

View Status

Date Submitted

Last Update

0028640

Community

[OCCT] OCCT:Modeling Algorithms

public

2017-04-07 12:51

2017-12-05 16:59

Reporter

devocctgp

Assigned To

msv

Priority

normal

Severity

minor

Status

new

Resolution

open

Platform

OS

OS Version

Product Version

Target Version

[OCCT] 7.4.0*

Fixed in Version

Summary

0028640: BRepBuilderAPI_Transform build invalid shape

Description

BRepBuilderAPI_Transform mirror a shape generates invalid shape

Steps To Reproduce

gp_Trsf _mirror_trsf;
_mirror_trsf.SetMirror(gp_Ax2(gp_Pnt(0, 0, 0), gp_Dir(1, 0, 0)));

_shape = BRepBuilderAPI_Transform(_origin_shape, _mirror_trsf)

## Draw script ##
restore origin_copy.brep a
tmirror a 0 0 0 1 0 0
checkshape a

Tags

No tags attached.

Test case number

bugs modalg_7 bug28640

error.png (76,379 bytes) 2017-04-07 12:51

mirror.brep (4,372,559 bytes) 2017-04-07 12:55

origin.zip (3,336,581 bytes) 2017-04-07 12:56

origin_copy.brep (2,033,617 bytes) 2017-04-07 16:09

Relationships

Notes
(0065023) devocctgp (developer) 2017-04-07 12:57 edited on: 2017-04-07 12:58	the origin brep file is lager than the limitation. so i zipped it ! and note the origin brep is about twice large as the mirror brep

(0065040) msv (developer) 2017-04-07 16:15	The size of origin shape is explained by redundant data in edges of the shape. The edges contain pogygons and triangulations not relevant to the faces of this shape. Transformation algorithm creates new edges and takes only relevant data. The same origin shape without garbage can be got by deep copying it with BRepBuilderAPI_Copy algorithm. The Draw command 'tcopy' does it. I have attached such copy of origin. Now mirror creates a shape with the same file size. I admit that the bug is reproduced. The mirrored shape does not pass the check by shape checker. I have put the draw script in steps to reproduce.

(0065068) devocctgp (developer) 2017-04-08 21:44	dear msv, after your explain, i understand the difference of size. so let's fix the mirror bug.

(0070136) mkv (tester) 2017-09-01 15:03	Problem described in issue is reproduced on current state of OCCT.

Issue History
Date Modified	Username	Field	Change
2017-04-07 12:51	devocctgp	New Issue
2017-04-07 12:51	devocctgp	Assigned To	=> msv
2017-04-07 12:51	devocctgp	File Added: error.png
2017-04-07 12:55	devocctgp	File Added: mirror.brep
2017-04-07 12:56	devocctgp	File Added: origin.zip
2017-04-07 12:57	devocctgp	Note Added: 0065023
2017-04-07 12:58	devocctgp	Note Edited: 0065023	View Revisions
2017-04-07 16:09	msv	File Added: origin_copy.brep
2017-04-07 16:15	msv	Note Added: 0065040
2017-04-07 16:22	msv	Steps to Reproduce Updated	View Revisions
2017-04-08 21:44	devocctgp	Note Added: 0065068
2017-07-21 11:22	msv	Target Version	7.2.0 => 7.3.0
2017-09-01 15:03	mkv	Test case number	=> bugs modalg_7 bug28640
2017-09-01 15:03	mkv	Note Added: 0070136
2017-12-05 16:59	msv	Target Version	7.3.0 => 7.4.0*

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