Bug 2217295

Summary:	Please update OpenCascade to 7.7.1
Product:	[Fedora] Fedora	Reporter:	H. Peter Anvin <hpa>
Component:	opencascade	Assignee:	Richard Shaw <hobbes1069>
Status:	NEW ---	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	unspecified
Version:	38	CC:	hobbes1069, laurent.rineau__fedora
Target Milestone:	---	Keywords:	Desktop
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Hardware:	x86_64
OS:	Linux
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:	2036372
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Description H. Peter Anvin 2023-06-26 01:47:02 UTC

OpenCascade 7.7.0 has been out since July 11, 2022.

It notably fixes bugs in mesh generation which makes FreeCAD unusable in a number of cases.

From the release notes:

Mesh
• BRepMesh works too long and produces many free nodes on a valid face
problems are resolved.
• Meshing the shape no longer takes too long and visualization problems are
corrected.
• Wrong shading display of thrusections is fixed.
• Rendering issue when using deviation coefficient of low value is resolved.
• Mesher no longer produce 'bad' result for extruded spline with given deviation
coefficient.
• Holes in triangulation with large linear deflection are removed.
• Broken triangulation on pipe shape is fixed.

Reproducible: Always

Actual Results:  
Many uses of intersecting or sharply turning pipes end up generating bad rendering and/or bad data exchange output.

This severely impedes correct operation of FreeCAD.

Comment 1 H. Peter Anvin 2023-06-26 01:50:55 UTC

OpenCascade 7.7.1 was not listed on opencascade.org, but was apparently released on March 21, 2023.

Comment 2 H. Peter Anvin 2023-06-26 02:00:36 UTC

Release notes for 7.7.1:

https://www.opencascade.com/open-cascade-technology-7-7-1-maintenance-release/

Fixes some pretty high severity bugs.

Comment 3 Richard Shaw 2023-06-26 22:17:28 UTC

Unfortunately the version of TBB in Fedora is too old. Hopefully a path forward is figured out now.