0029499: "sprops" command returns 0 for the face with a gap covered by vertex only (not edge)

ID	Project	Category	View Status	Date Submitted	Last Update

0029499	Open CASCADE	OCCT:Modeling Algorithms	public	2018-02-09 16:49	2023-08-01 15:06

Reporter	~~nbv~~	Assigned To	~~msv~~
Priority	normal	Severity	minor
Status	new	Resolution	open
Target Version	Unscheduled

Summary	0029499: "sprops" command returns 0 for the face with a gap covered by vertex only (not edge)
Description	There is a rectangular face without one edge. And this gap is covered by the vertex tolerance. See "gapface.PNG" attached picture. This face is topologically closed and valid for OCCT. However, "sprops" DRAW-command returns 0 as result of its area computation. P.S. In fact, this face is based on B-spline surface. If I substitute this surface to planar (see SCRIPT # 2 in Steps To Reproduce) then not-zero area will be computed (result is 0.0763309)
Steps To Reproduce	restore [locate_data_file bug29499_bsface.brep] result checkshape result # This shape seems to be valid SCRIPT # 1 sprops result 1.0e-4 # Mass : 0 ==> WRONG SCRIPT # 2 explode result w plane pl 0 0 4.2 0 0 1 1 0 0 mkface ff pl result_1 checkshape ff # This shape seems to be valid sprops ff 1.0e-4 #Mass : 0.0763309
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Test case number

Date Modified	Username	Field	Change
2018-02-09 16:49	~~nbv~~	New Issue
2018-02-09 16:49	~~nbv~~	Assigned To	=> msv
2018-02-09 16:49	~~nbv~~	File Added: gapface.PNG
2018-02-09 16:53	~~nbv~~	File Added: bug29499_bsface.brep
2018-02-09 16:54	~~nbv~~	File Deleted: bug29499_bsface.brep
2018-02-09 16:57	~~nbv~~	File Added: bug29499_bsface.brep
2018-02-09 17:03	~~nbv~~	Description Updated
2018-02-09 17:03	~~nbv~~	Steps to Reproduce Updated
2019-08-12 16:54	~~msv~~	Target Version	7.4.0 => 7.5.0
2020-09-14 22:54	~~msv~~	Target Version	7.5.0 => 7.6.0
2021-08-29 18:51	~~msv~~	Target Version	7.6.0 => 7.7.0
2022-10-24 10:43	szy	Target Version	7.7.0 => 7.8.0
2023-08-01 15:06	dpasukhi	Target Version	7.8.0 => Unscheduled