I have a product that I re-generate from an OpenSCAD script occasionally.  This time I ended up with these messages, four times.  Interestingly, I have Stop On First Warning set. Rendering Polygon Mesh using Manifold... WARNING: Minkowski: Nef polyhedron converted from mesh is invalid! WARNING: [manifold] Minkowski failed with error, falling back to Nef operation: Minkowski: Nef polyhedron converted from mesh is invalid! ERROR: Nef minkoswki operation failed: CGAL ERROR: assertion violation! Expr: N.is_valid(0,0) File: /mxe/usr/x86_64-w64-mingw32.static.posix/include/CGAL/convex_decomposition_3.h Line: 136 The resulting model looks fine. Any thoughts? Jon OpenSCAD version 2026.01.19 -- This email has been checked for viruses by AVG antivirus software. www.avg.com

After I sent this message out, I did an F6 so I could print the object. No error messages. I then did an F5. No error messages. Strange. Perhaps unreproducable. On 3/7/2026 10:54 AM, Jon Bondy via Discuss wrote: I have a product that I re-generate from an OpenSCAD script occasionally. This time I ended up with these messages, four times. Interestingly, I have Stop On First Warning set. Rendering Polygon Mesh using Manifold... WARNING: Minkowski: Nef polyhedron converted from mesh is invalid! WARNING: [manifold] Minkowski failed with error, falling back to Nef operation: Minkowski: Nef polyhedron converted from mesh is invalid! ERROR: Nef minkoswki operation failed: CGAL ERROR: assertion violation! Expr: N.is_valid(0,0) File: /mxe/usr/x86_64-w64-mingw32.static.posix/include/CGAL/convex_decomposition_3.h Line: 136 The resulting model looks fine. Any thoughts? Jon OpenSCAD version 2026.01.19 [https://s-install.avcdn.net/ipm/preview/icons/icon-envelope-tick-green-avg-v1.png]<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.avg.com_email-2Dsignature-3Futm-5Fmedium-3Demail-26utm-5Fsource-3Dlink-26utm-5Fcampaign-3Dsig-2Demail-26utm-5Fcontent-3Demailclient&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=dnzB9imniP1517MSTEwce7NCQmMzmbA66AMppd8obGpdLpcgH2wvY7nP8MsQOHZW&s=_gNpU80RWUXthLC7GK8m3NXlgygx0UDPtzttp7FzllY&e=> Virus-free.www.avg.com<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.avg.com_email-2Dsignature-3Futm-5Fmedium-3Demail-26utm-5Fsource-3Dlink-26utm-5Fcampaign-3Dsig-2Demail-26utm-5Fcontent-3Demailclient&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=dnzB9imniP1517MSTEwce7NCQmMzmbA66AMppd8obGpdLpcgH2wvY7nP8MsQOHZW&s=_gNpU80RWUXthLC7GK8m3NXlgygx0UDPtzttp7FzllY&e=> _______________________________________________ OpenSCAD mailing list To unsubscribe send an email to discuss-leave@lists.openscad.org<mailto:discuss-leave@lists.openscad.org>

Did you clear the cache before doing that? Is your problem the same as this one? https://github.com/openscad/openscad/issues/6130 On Sat, Mar 7, 2026 at 11:05 AM jon jonbondy.com via Discuss < discuss@lists.openscad.org> wrote: > After I sent this message out, I did an F6 so I could print the object. > No error messages. I then did an F5. No error messages. > > Strange. Perhaps unreproducable. > > > On 3/7/2026 10:54 AM, Jon Bondy via Discuss wrote: > > I have a product that I re-generate from an OpenSCAD script occasionally. > This time I ended up with these messages, four times. Interestingly, I > have Stop On First Warning set. > > > Rendering Polygon Mesh using Manifold... > > WARNING: Minkowski: Nef polyhedron converted from mesh is invalid! > > WARNING: [manifold] Minkowski failed with error, falling back to Nef > operation: Minkowski: Nef polyhedron converted from mesh is invalid! > > ERROR: Nef minkoswki operation failed: CGAL ERROR: assertion violation! > > Expr: N.is_valid(0,0) > > File: > /mxe/usr/x86_64-w64-mingw32.static.posix/include/CGAL/convex_decomposition_3.h > > Line: 136 > > > The resulting model looks fine. > > Any thoughts? > > Jon > > OpenSCAD version 2026.01.19 > > > > > <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.avg.com_email-2Dsignature-3Futm-5Fmedium-3Demail-26utm-5Fsource-3Dlink-26utm-5Fcampaign-3Dsig-2Demail-26utm-5Fcontent-3Demailclient&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=dnzB9imniP1517MSTEwce7NCQmMzmbA66AMppd8obGpdLpcgH2wvY7nP8MsQOHZW&s=_gNpU80RWUXthLC7GK8m3NXlgygx0UDPtzttp7FzllY&e=> > Virus-free.www.avg.com > <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.avg.com_email-2Dsignature-3Futm-5Fmedium-3Demail-26utm-5Fsource-3Dlink-26utm-5Fcampaign-3Dsig-2Demail-26utm-5Fcontent-3Demailclient&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=dnzB9imniP1517MSTEwce7NCQmMzmbA66AMppd8obGpdLpcgH2wvY7nP8MsQOHZW&s=_gNpU80RWUXthLC7GK8m3NXlgygx0UDPtzttp7FzllY&e=> > <#m_-8688420278565212504_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org > > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org

 After I sent this message out, I did an F6 so I could print the
 object.  No error messages.  I then did an F5. No error messages.

 Strange.  Perhaps unreproducable.


 On 3/7/2026 10:54 AM, Jon Bondy via Discuss wrote:

 I have a product that I re-generate from an OpenSCAD script
 occasionally.  This time I ended up with these messages, four
 times.  Interestingly, I have Stop On First Warning set.


 Rendering Polygon Mesh using Manifold...

 WARNING: Minkowski: Nef polyhedron converted from mesh is invalid!

 WARNING: [manifold] Minkowski failed with error, falling back to
 Nef operation: Minkowski: Nef polyhedron converted from mesh is
 invalid!

 ERROR: Nef minkoswki operation failed: CGAL ERROR: assertion
 violation!

 Expr: N.is_valid(0,0)

 File:
 /mxe/usr/x86_64-w64-mingw32.static.posix/include/CGAL/convex_decomposition_3.h

 Line: 136


 The resulting model looks fine.

 Any thoughts?

 Jon

 OpenSCAD version 2026.01.19



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Adrian: I did not clear the cache prior to the problem Could be.  Since it is gone, it is hard for me to say. Jon On 3/7/2026 11:11 AM, Adrian Mariano via Discuss wrote: > Did you clear the cache before doing that? > > Is your problem the same as this one? > https://github.com/openscad/openscad/issues/6130 > <https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_openscad_openscad_issues_6130&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=2FPcornXvWU34lDnEQmoOVR63EAZRn6g7FsS7cx39p5PM0NdM1os1LfEnRH1eadS&s=5c1XIiTlAo3U2m-Q-aScYn-M8qSxtOpTwv-vspPU6Hk&e=> > > On Sat, Mar 7, 2026 at 11:05 AM jon jonbondy.com > <https://urldefense.proofpoint.com/v2/url?u=http-3A__jonbondy.com&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=2FPcornXvWU34lDnEQmoOVR63EAZRn6g7FsS7cx39p5PM0NdM1os1LfEnRH1eadS&s=4IEkZE6ACxeNaol7BTSJB3BKOpT_Mx5v6l86VmQungY&e=> > via Discuss <discuss@lists.openscad.org> wrote: > > After I sent this message out, I did an F6 so I could print the > object.  No error messages.  I then did an F5. No error messages. > > Strange.  Perhaps unreproducable. > > > On 3/7/2026 10:54 AM, Jon Bondy via Discuss wrote: >> >> I have a product that I re-generate from an OpenSCAD script >> occasionally.  This time I ended up with these messages, four >> times.  Interestingly, I have Stop On First Warning set. >> >> >> Rendering Polygon Mesh using Manifold... >> >> WARNING: Minkowski: Nef polyhedron converted from mesh is invalid! >> >> WARNING: [manifold] Minkowski failed with error, falling back to >> Nef operation: Minkowski: Nef polyhedron converted from mesh is >> invalid! >> >> ERROR: Nef minkoswki operation failed: CGAL ERROR: assertion >> violation! >> >> Expr: N.is_valid(0,0) >> >> File: >> /mxe/usr/x86_64-w64-mingw32.static.posix/include/CGAL/convex_decomposition_3.h >> >> Line: 136 >> >> >> The resulting model looks fine. >> >> Any thoughts? >> >> Jon >> >> OpenSCAD version 2026.01.19 >> >> >> >> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.avg.com_email-2Dsignature-3Futm-5Fmedium-3Demail-26utm-5Fsource-3Dlink-26utm-5Fcampaign-3Dsig-2Demail-26utm-5Fcontent-3Demailclient&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=dnzB9imniP1517MSTEwce7NCQmMzmbA66AMppd8obGpdLpcgH2wvY7nP8MsQOHZW&s=_gNpU80RWUXthLC7GK8m3NXlgygx0UDPtzttp7FzllY&e=> >> Virus-free.www.avg.com >> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.avg.com_email-2Dsignature-3Futm-5Fmedium-3Demail-26utm-5Fsource-3Dlink-26utm-5Fcampaign-3Dsig-2Demail-26utm-5Fcontent-3Demailclient&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=dnzB9imniP1517MSTEwce7NCQmMzmbA66AMppd8obGpdLpcgH2wvY7nP8MsQOHZW&s=_gNpU80RWUXthLC7GK8m3NXlgygx0UDPtzttp7FzllY&e=> >> >> >> >> _______________________________________________ >> OpenSCAD mailing list >> To unsubscribe send an email todiscuss-leave@lists.openscad.org > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org > > > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email todiscuss-leave@lists.openscad.org -- This email has been checked for viruses by AVG antivirus software. www.avg.com

I get this error a lot. And like the OP for me a simple repeat of F5 or F6 and it executes without error. Most often encountered with the first preview/render of a program with minkowski calls after launch of OpenSCAD. Leads me to the assumption that there is some memory/bounds limit that is increased as the code is being processed but that the error/warning condition has already tripped. When rerunning preview or render the limiting value proceeds with the ’newly bumped’ value so it processes successfully. > On Mar 7, 2026, at 10:39 AM, Jon Bondy via Discuss <discuss@lists.openscad.org> wrote: > > Adrian: > > I did not clear the cache prior to the problem > > Could be. Since it is gone, it is hard for me to say. > > Jon > > > > On 3/7/2026 11:11 AM, Adrian Mariano via Discuss wrote: >> Did you clear the cache before doing that? >> >> Is your problem the same as this one? >> https://github.com/openscad/openscad/issues/6130 <https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_openscad_openscad_issues_6130&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=2FPcornXvWU34lDnEQmoOVR63EAZRn6g7FsS7cx39p5PM0NdM1os1LfEnRH1eadS&s=5c1XIiTlAo3U2m-Q-aScYn-M8qSxtOpTwv-vspPU6Hk&e=> >> On Sat, Mar 7, 2026 at 11:05 AM jon jonbondy.com <https://urldefense.proofpoint.com/v2/url?u=http-3A__jonbondy.com&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=2FPcornXvWU34lDnEQmoOVR63EAZRn6g7FsS7cx39p5PM0NdM1os1LfEnRH1eadS&s=4IEkZE6ACxeNaol7BTSJB3BKOpT_Mx5v6l86VmQungY&e=> via Discuss <discuss@lists.openscad.org <mailto:discuss@lists.openscad.org>> wrote: >>> After I sent this message out, I did an F6 so I could print the object. No error messages. I then did an F5. No error messages. >>> >>> Strange. Perhaps unreproducable. >>> >>> >>> >>> On 3/7/2026 10:54 AM, Jon Bondy via Discuss wrote: >>>> I have a product that I re-generate from an OpenSCAD script occasionally. This time I ended up with these messages, four times. Interestingly, I have Stop On First Warning set. >>>> >>>> >>>> >>>> Rendering Polygon Mesh using Manifold... >>>> >>>> WARNING: Minkowski: Nef polyhedron converted from mesh is invalid! >>>> >>>> WARNING: [manifold] Minkowski failed with error, falling back to Nef operation: Minkowski: Nef polyhedron converted from mesh is invalid! >>>> >>>> ERROR: Nef minkoswki operation failed: CGAL ERROR: assertion violation! >>>> >>>> Expr: N.is_valid(0,0) >>>> >>>> File: /mxe/usr/x86_64-w64-mingw32.static.posix/include/CGAL/convex_decomposition_3.h >>>> >>>> Line: 136 >>>> >>>> >>>> >>>> The resulting model looks fine. >>>> >>>> Any thoughts? >>>> >>>> Jon >>>> >>>> OpenSCAD version 2026.01.19 >>>> >>>> >>>> >>>> >>>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.avg.com_email-2Dsignature-3Futm-5Fmedium-3Demail-26utm-5Fsource-3Dlink-26utm-5Fcampaign-3Dsig-2Demail-26utm-5Fcontent-3Demailclient&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=dnzB9imniP1517MSTEwce7NCQmMzmbA66AMppd8obGpdLpcgH2wvY7nP8MsQOHZW&s=_gNpU80RWUXthLC7GK8m3NXlgygx0UDPtzttp7FzllY&e=> Virus-free.www.avg.com <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.avg.com_email-2Dsignature-3Futm-5Fmedium-3Demail-26utm-5Fsource-3Dlink-26utm-5Fcampaign-3Dsig-2Demail-26utm-5Fcontent-3Demailclient&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=dnzB9imniP1517MSTEwce7NCQmMzmbA66AMppd8obGpdLpcgH2wvY7nP8MsQOHZW&s=_gNpU80RWUXthLC7GK8m3NXlgygx0UDPtzttp7FzllY&e=> >>>> >>>> _______________________________________________ >>>> OpenSCAD mailing list >>>> To unsubscribe send an email to discuss-leave@lists.openscad.org <mailto:discuss-leave@lists.openscad.org>_______________________________________________ >>> OpenSCAD mailing list >>> To unsubscribe send an email to discuss-leave@lists.openscad.org <mailto:discuss-leave@lists.openscad.org> >> >> _______________________________________________ >> OpenSCAD mailing list >> To unsubscribe send an email to discuss-leave@lists.openscad.org <mailto:discuss-leave@lists.openscad.org>_______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org

i wouldn't expect that the issue is addressed just because there is no further warning output. import failures initially throw a warning which is not repeated on subsequent previews or renders. On Sat, Mar 7, 2026, 13:10 Hugo Jackson via Discuss < discuss@lists.openscad.org> wrote: > I get this error a lot. And like the OP for me a simple repeat of F5 or F6 > and it executes without error. Most often encountered with the first > preview/render of a program with minkowski calls after launch of OpenSCAD. > Leads me to the assumption that there is some memory/bounds limit that is > increased as the code is being processed but that the error/warning > condition has already tripped. When rerunning preview or render the > limiting value proceeds with the ’newly bumped’ value so it processes > successfully. > > On Mar 7, 2026, at 10:39 AM, Jon Bondy via Discuss < > discuss@lists.openscad.org> wrote: > > Adrian: > > I did not clear the cache prior to the problem > > Could be. Since it is gone, it is hard for me to say. > > Jon > > > On 3/7/2026 11:11 AM, Adrian Mariano via Discuss wrote: > > Did you clear the cache before doing that? > > Is your problem the same as this one? > https://github.com/openscad/openscad/issues/6130 > <https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_openscad_openscad_issues_6130&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=2FPcornXvWU34lDnEQmoOVR63EAZRn6g7FsS7cx39p5PM0NdM1os1LfEnRH1eadS&s=5c1XIiTlAo3U2m-Q-aScYn-M8qSxtOpTwv-vspPU6Hk&e=> > > On Sat, Mar 7, 2026 at 11:05 AM jon jonbondy.com > <https://urldefense.proofpoint.com/v2/url?u=http-3A__jonbondy.com&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=2FPcornXvWU34lDnEQmoOVR63EAZRn6g7FsS7cx39p5PM0NdM1os1LfEnRH1eadS&s=4IEkZE6ACxeNaol7BTSJB3BKOpT_Mx5v6l86VmQungY&e=> > via Discuss <discuss@lists.openscad.org> wrote: > >> After I sent this message out, I did an F6 so I could print the object. >> No error messages. I then did an F5. No error messages. >> >> Strange. Perhaps unreproducable. >> >> >> On 3/7/2026 10:54 AM, Jon Bondy via Discuss wrote: >> >> I have a product that I re-generate from an OpenSCAD script >> occasionally. This time I ended up with these messages, four times. >> Interestingly, I have Stop On First Warning set. >> >> >> Rendering Polygon Mesh using Manifold... >> >> WARNING: Minkowski: Nef polyhedron converted from mesh is invalid! >> >> WARNING: [manifold] Minkowski failed with error, falling back to Nef >> operation: Minkowski: Nef polyhedron converted from mesh is invalid! >> >> ERROR: Nef minkoswki operation failed: CGAL ERROR: assertion violation! >> >> Expr: N.is_valid(0,0) >> >> File: >> /mxe/usr/x86_64-w64-mingw32.static.posix/include/CGAL/convex_decomposition_3.h >> >> Line: 136 >> >> >> The resulting model looks fine. >> >> Any thoughts? >> >> Jon >> >> OpenSCAD version 2026.01.19 >> >> >> >> >> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.avg.com_email-2Dsignature-3Futm-5Fmedium-3Demail-26utm-5Fsource-3Dlink-26utm-5Fcampaign-3Dsig-2Demail-26utm-5Fcontent-3Demailclient&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=dnzB9imniP1517MSTEwce7NCQmMzmbA66AMppd8obGpdLpcgH2wvY7nP8MsQOHZW&s=_gNpU80RWUXthLC7GK8m3NXlgygx0UDPtzttp7FzllY&e=> >> Virus-free.www.avg.com >> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.avg.com_email-2Dsignature-3Futm-5Fmedium-3Demail-26utm-5Fsource-3Dlink-26utm-5Fcampaign-3Dsig-2Demail-26utm-5Fcontent-3Demailclient&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=dnzB9imniP1517MSTEwce7NCQmMzmbA66AMppd8obGpdLpcgH2wvY7nP8MsQOHZW&s=_gNpU80RWUXthLC7GK8m3NXlgygx0UDPtzttp7FzllY&e=> >> >> _______________________________________________ >> OpenSCAD mailing list >> To unsubscribe send an email to discuss-leave@lists.openscad.org >> >> _______________________________________________ >> OpenSCAD mailing list >> To unsubscribe send an email to discuss-leave@lists.openscad.org > > > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org > > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org > > > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org

My point about clearing the cache is that if you run a model you ran already then it can be in the cache and you won't get the same messages you got the first time. It appears that in this case a bunch of messages appear and yet the model works anyway, so I would expect subsequent times the model will work without any messages. On Sat, Mar 7, 2026 at 2:52 PM Jamie Larkby-Lahet via Discuss < discuss@lists.openscad.org> wrote: > i wouldn't expect that the issue is addressed just because there is no > further warning output. > > import failures initially throw a warning which is not repeated on > subsequent previews or renders. > > On Sat, Mar 7, 2026, 13:10 Hugo Jackson via Discuss < > discuss@lists.openscad.org> wrote: > >> I get this error a lot. And like the OP for me a simple repeat of F5 or >> F6 and it executes without error. Most often encountered with the first >> preview/render of a program with minkowski calls after launch of OpenSCAD. >> Leads me to the assumption that there is some memory/bounds limit that is >> increased as the code is being processed but that the error/warning >> condition has already tripped. When rerunning preview or render the >> limiting value proceeds with the ’newly bumped’ value so it processes >> successfully. >> >> On Mar 7, 2026, at 10:39 AM, Jon Bondy via Discuss < >> discuss@lists.openscad.org> wrote: >> >> Adrian: >> >> I did not clear the cache prior to the problem >> >> Could be. Since it is gone, it is hard for me to say. >> >> Jon >> >> >> On 3/7/2026 11:11 AM, Adrian Mariano via Discuss wrote: >> >> Did you clear the cache before doing that? >> >> Is your problem the same as this one? >> https://github.com/openscad/openscad/issues/6130 >> <https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_openscad_openscad_issues_6130&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=2FPcornXvWU34lDnEQmoOVR63EAZRn6g7FsS7cx39p5PM0NdM1os1LfEnRH1eadS&s=5c1XIiTlAo3U2m-Q-aScYn-M8qSxtOpTwv-vspPU6Hk&e=> >> >> On Sat, Mar 7, 2026 at 11:05 AM jon jonbondy.com >> <https://urldefense.proofpoint.com/v2/url?u=http-3A__jonbondy.com&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=2FPcornXvWU34lDnEQmoOVR63EAZRn6g7FsS7cx39p5PM0NdM1os1LfEnRH1eadS&s=4IEkZE6ACxeNaol7BTSJB3BKOpT_Mx5v6l86VmQungY&e=> >> via Discuss <discuss@lists.openscad.org> wrote: >> >>> After I sent this message out, I did an F6 so I could print the object. >>> No error messages. I then did an F5. No error messages. >>> >>> Strange. Perhaps unreproducable. >>> >>> >>> On 3/7/2026 10:54 AM, Jon Bondy via Discuss wrote: >>> >>> I have a product that I re-generate from an OpenSCAD script >>> occasionally. This time I ended up with these messages, four times. >>> Interestingly, I have Stop On First Warning set. >>> >>> >>> Rendering Polygon Mesh using Manifold... >>> >>> WARNING: Minkowski: Nef polyhedron converted from mesh is invalid! >>> >>> WARNING: [manifold] Minkowski failed with error, falling back to Nef >>> operation: Minkowski: Nef polyhedron converted from mesh is invalid! >>> >>> ERROR: Nef minkoswki operation failed: CGAL ERROR: assertion violation! >>> >>> Expr: N.is_valid(0,0) >>> >>> File: >>> /mxe/usr/x86_64-w64-mingw32.static.posix/include/CGAL/convex_decomposition_3.h >>> >>> Line: 136 >>> >>> >>> The resulting model looks fine. >>> >>> Any thoughts? >>> >>> Jon >>> >>> OpenSCAD version 2026.01.19 >>> >>> >>> >>> >>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.avg.com_email-2Dsignature-3Futm-5Fmedium-3Demail-26utm-5Fsource-3Dlink-26utm-5Fcampaign-3Dsig-2Demail-26utm-5Fcontent-3Demailclient&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=dnzB9imniP1517MSTEwce7NCQmMzmbA66AMppd8obGpdLpcgH2wvY7nP8MsQOHZW&s=_gNpU80RWUXthLC7GK8m3NXlgygx0UDPtzttp7FzllY&e=> >>> Virus-free.www.avg.com >>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.avg.com_email-2Dsignature-3Futm-5Fmedium-3Demail-26utm-5Fsource-3Dlink-26utm-5Fcampaign-3Dsig-2Demail-26utm-5Fcontent-3Demailclient&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=AsrE-c7ZR7B2Kyr3qgfvvppkCEBVsNmwEMndcrRSuOI&m=dnzB9imniP1517MSTEwce7NCQmMzmbA66AMppd8obGpdLpcgH2wvY7nP8MsQOHZW&s=_gNpU80RWUXthLC7GK8m3NXlgygx0UDPtzttp7FzllY&e=> >>> >>> _______________________________________________ >>> OpenSCAD mailing list >>> To unsubscribe send an email to discuss-leave@lists.openscad.org >>> >>> _______________________________________________ >>> OpenSCAD mailing list >>> To unsubscribe send an email to discuss-leave@lists.openscad.org >> >> >> _______________________________________________ >> OpenSCAD mailing list >> To unsubscribe send an email to discuss-leave@lists.openscad.org >> >> _______________________________________________ >> OpenSCAD mailing list >> To unsubscribe send an email to discuss-leave@lists.openscad.org >> >> >> _______________________________________________ >> OpenSCAD mailing list >> To unsubscribe send an email to discuss-leave@lists.openscad.org > > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org