0025264: Mesh very slow for Revol shape

ID	Project	Category	View Status	Date Submitted	Last Update

0025264	Community	OCCT:Mesh	public	2014-09-23 14:35	2016-12-09 16:39

Reporter	eryar	Assigned To	apn
Priority	normal	Severity	minor
Status	closed	Resolution	fixed
Platform	Windows	OS	VC++ 2008
Product Version	6.7.1
Target Version	7.1.0	Fixed in Version	7.1.0

Summary	0025264: Mesh very slow for Revol shape
Description	Mesh algorithm very slow for a revol shape in occ6.7, while in occ6.2.0 is very fast. PS: The deflection of the BRepMesh::Mesh only have the effect for sphere; other shapes or surfaces have no effect.
Tags	No tags attached.

Test case number	bugs mesh bug25264

eryar 2014-09-23 14:35 developer	mesh_revol.PNG (30,656 bytes)

eryar 2014-09-23 14:35 developer	wire.brep (1,475 bytes)

eryar 2014-09-23 14:36 developer	revol.tcl (400 bytes)

git 2016-02-08 15:52 administrator ~0050486	Branch CR25264 has been created by oan. SHA-1: 4bbba407a83264ae4b34853c1a88b2876120e119 Detailed log of new commits: Author: oan Date: Mon Feb 8 15:51:59 2016 +0300 0025264: Mesh very slow for Revol shape Test case added

oan 2016-02-08 15:56 developer ~0050487	Dear Mikhail, on current master meshing of the problematic shape takes about 2 seconds instead of 52 seconds mentioned in the bug. Difference between OCCT version 6.2 is due to changed meshing algorithm. Test case has been pushed to branch CR25264. Please review.

~~msv~~ 2016-02-08 16:10 developer ~0050489	Reviewed.

~~abv~~ 2016-02-08 19:52 manager ~0050503	Oleg, the problem does exist: I have tried with OCCT 6.0, and it takes 0.2 sec, while on current master it works ~ 13 sec. Note that it is not correct to rely on time of vdisplay command, as it may use different parameters in different versions. Use incmesh command instead: tclean result; chrono s reset; chrono s start; incmesh result 0.1; chrono s show For me, it takes 0.05 sec (33 K triangles) in OCCT 6.0 and 2.5 sec (31 K triangles) in master. For tolerance 0.001, it works 2.3 sec in OCCT 6.0, and 112 sec in master. As we see, slow down is ~ 50 times regardless of deflection (and corresponding number of elements), and I believe that difference of the algorithm should not be blamed without in-depth analysis.

~~abv~~ 2016-02-09 11:14 manager ~0050513	More timings, incmesh with deflection 0.1: OCCT 6.0.0: 0.05 sec, 33030 triangles OCCT 6.3.1: 14.4 sec, 32480 triangles OCCT 6.5.0: 2.25 sec, 32624 triangles OCCT 6.6.0: 2.37 sec, 31208 triangles OCCT 6.7.0: 2.21 sec, 31208 triangles OCCT 6.8.0: 1.9 sec, 31208 triangles OCCT 6.9.0: 2.02 sec, 31090 triangles OCCT 6.9.1: 2.01 sec, 31090 triangles master : 2.02 sec, 31090 triangles

git 2016-10-17 12:21 administrator ~0058773	Branch CR25264_1 has been created by oan. SHA-1: 9c651b4d32e64d4fcfef1e086018781035743c98 Detailed log of new commits: Author: oan Date: Mon Oct 17 12:21:25 2016 +0300 0025264: Mesh very slow for Revol shape Test case added

oan 2016-10-17 12:27 developer ~0058774	Dear Bugmaster, behaviour of BRepMesh component has been improved for case of thin cylindrical surfaces in context of #27442 issue. The following timings used in test suites are produced on current master: CPU user time: 0.0468003 sec for reference case CPU user time: 0.0468003 sec for problematic case Test case for current issue has been created and pushed to branch CR25264_1. Please test and close the issue. Best regards.

git 2016-10-25 20:02 administrator ~0059119	Branch CR25264_1 has been updated by apn. SHA-1: 9bc559e702a0a9e7025881c17b09a8de5b0ca574 Detailed log of new commits: Author: apn Date: Tue Oct 25 20:01:42 2016 +0300 Small corrections of test case

apn 2016-10-25 20:09 administrator ~0059120	Test case: bugs mesh bug25264 - OK

git 2016-10-28 21:37 administrator ~0059397	Branch CR25264_1 has been deleted by kgv. SHA-1: 9bc559e702a0a9e7025881c17b09a8de5b0ca574

git 2016-10-28 21:51 administrator ~0059598	Branch CR25264 has been deleted by kgv. SHA-1: 4bbba407a83264ae4b34853c1a88b2876120e119

Date Modified	Username	Field	Change
2014-09-23 14:35	eryar	New Issue
2014-09-23 14:35	eryar	Assigned To	=> oan
2014-09-23 14:35	eryar	File Added: mesh_revol.PNG
2014-09-23 14:35	eryar	File Added: wire.brep
2014-09-23 14:36	eryar	File Added: revol.tcl
2016-02-08 15:52	git	Note Added: 0050486
2016-02-08 15:55	oan	Assigned To	oan => msv
2016-02-08 15:55	oan	Status	new => resolved
2016-02-08 15:55	oan	Steps to Reproduce Updated
2016-02-08 15:55	oan	Steps to Reproduce Updated
2016-02-08 15:56	oan	Note Added: 0050487
2016-02-08 16:10	~~msv~~	Note Added: 0050489
2016-02-08 16:10	~~msv~~	Assigned To	msv => bugmaster
2016-02-08 16:10	~~msv~~	Status	resolved => reviewed
2016-02-08 17:05	~~apv~~	Assigned To	bugmaster => apv
2016-02-08 19:52	~~abv~~	Note Added: 0050503
2016-02-08 19:52	~~abv~~	Assigned To	apv => oan
2016-02-08 19:52	~~abv~~	Status	reviewed => assigned
2016-02-08 19:52	~~abv~~	Target Version	=> 7.1.0
2016-02-09 11:14	~~abv~~	Note Added: 0050513
2016-10-17 12:21	git	Note Added: 0058773
2016-10-17 12:27	oan	Note Added: 0058774
2016-10-17 12:28	oan	Assigned To	oan => bugmaster
2016-10-17 12:28	oan	Status	assigned => feedback
2016-10-25 20:02	git	Note Added: 0059119
2016-10-25 20:09	apn	Note Added: 0059120
2016-10-25 20:10	apn	Test case number	=> bugs mesh bug25264
2016-10-25 20:10	apn	Status	feedback => tested
2016-10-28 14:35	apn	Changeset attached	=> occt master f204ec4c
2016-10-28 14:35	apn	Assigned To	bugmaster => apn
2016-10-28 14:35	apn	Status	tested => verified
2016-10-28 14:35	apn	Resolution	open => fixed
2016-10-28 21:37	git	Note Added: 0059397
2016-10-28 21:51	git	Note Added: 0059598
2016-12-09 16:30	~~aiv~~	Status	verified => closed
2016-12-09 16:39	~~aiv~~	Fixed in Version	=> 7.1.0

occt: master f204ec4c 2016-10-27 14:18:18 oan Committer: apn Details Diff	0025264: Mesh very slow for Revol shape Test case added Small corrections of test case		Affected Issues 0025264
	add - tests/bugs/mesh/bug25264		Diff File

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