0033862: Bug in BRepFill_PipeShell or BRepFill_Sweep with a spline as a spine wire - MantisBT

ID	Project	Category	View Status	Date Submitted	Last Update

0033862	Community	OCCT:Modeling Algorithms	public	2025-01-08 17:48	2025-01-09 21:52

Reporter	manuylovich	Assigned To
Priority	normal	Severity	major
Status	new	Resolution	open
Platform	Windows	OS	VC++ 2022
Product Version	7.8.0

Summary	0033862: Bug in BRepFill_PipeShell or BRepFill_Sweep with a spline as a spine wire
Description	A bug exists in BRepFill_PipeShell or BRepFill_Sweep (as BRepFill_PipeShell relies on this class) when using a spline as the spine wire. This appears to be the same unresolved issue described here: https://dev.opencascade.org/content/brepoffsetapimakepipeshell-bspline-error The issue is related to the construction of a faulty surface, even for a single segment associated with a single edge of the spine wire.
Steps To Reproduce	1. Create a TopoDS_Wire spineWire consisting of a single smooth spline edge. 2. Create a circular TopoDS_Wire profile to use for sweeping. 3. Instantiate a BRepFill_PipeShell object with the spine wire: BRepFill_PipeShell pipe(spineWire). 4. Add the profile to the pipe: pipe.Add(profile, Standard_False, Standard_True). 5. Set the transition mode: pipe.SetTransition(BRepFill_Modified). 6. Build the pipe: pipe.Build(). In most cases for splines, this sequence leads to a faulty result. The error is related to the construction of an erroneous surface between certain nodes of the spline curve. More specifically, in certain regions along the spline, the radius of the pipe deviates significantly, becoming either much smaller or larger than the radius of the original profile, suggesting computational instability.
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Test case number

Date Modified	Username	Field	Change
2025-01-08 17:48	manuylovich	New Issue
2025-01-08 17:48	manuylovich	Assigned To	=> akaftasev
2025-01-09 21:52	manuylovich	Assigned To	akaftasev =>