0028696: Offset 2D algorithm produces micro edges

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0028696

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[OCCT] OCCT:Modeling Algorithms

public

2017-04-28 09:50

2017-12-05 16:59

Reporter

msv

Assigned To

msv

Priority

normal

Severity

minor

Status

new

Resolution

open

Platform

OS Version

Product Version

[OCCT] 7.1.0

Target Version

[OCCT] 7.4.0*

Fixed in Version

Summary

0028696: Offset 2D algorithm produces micro edges

Description

This use case is given from the test bugs modalg_1 bug16667_3. From initial well defined wire consisting of 8 smoothly connected edges the command mkoffset produces a wire with 10 edges, two of which are too small according to ValidRange criteria (see BRepLib::FindValidRange).
The snapshot shows the initial wire and the result with orientations of edges.

Steps To Reproduce

test bugs modalg_1 bug16667_3
test bugs modalg_1 bug16667_4

# check that all edges have enough length
foreach e [explode result e] {
  if {[validrange $e] == "edge has no valid range"} {
    regexp {Mass : *([0-9\-+.eE]+)} [lprops $e] dummy len
    regexp {Tolerance MAX=([0-9\-+.eE]+)} [tolerance r_1] dummy tol
    puts "Error: edge $e (lenth=$len, tolerance=$tol) is too small"
  }
}

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No tags attached.

Test case number

bugs modalg_7 bug28696_1, bug28696_2

Attached Files

wire_n_offset.PNG (7,165 bytes) 2017-04-28 09:50

Relationships

Notes
(0065630) msv (developer) 2017-04-28 10:04	The same bug is in test case bugs modalg_1 bug16667_4

(0070002) apv (tester) 2017-08-28 17:14	Problem described in issue is reproduced on current state of OCCT.

Issue History
Date Modified	Username	Field	Change
2017-04-28 09:50	msv	New Issue
2017-04-28 09:50	msv	Assigned To	=> msv
2017-04-28 09:50	msv	File Added: wire_n_offset.PNG
2017-04-28 09:51	msv	Relationship added	related to 0023731
2017-04-28 10:04	msv	Note Added: 0065630
2017-04-28 10:04	msv	Steps to Reproduce Updated	View Revisions
2017-07-24 09:22	msv	Target Version	7.2.0 => 7.3.0
2017-08-28 17:14	apv	Test case number	=> bugs modalg_7 bug28696_1, bug28696_2
2017-08-28 17:14	apv	Note Added: 0070002
2017-12-05 16:59	msv	Target Version	7.3.0 => 7.4.0*