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2D line display is broken
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Description

System Information
Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.86

Blender Version
Broken: version: 2.81 (sub 2), branch: master, commit date: 2019-08-20 07:45, hash: rBf2cab8267f22
Worked: (optional) 2.80 official release

Short description of error
The 2D line display (i.e. CAD curves that have been converted to meshes) is broken in 2.81. See the attached image. The left window shows what the object looks like in 2.80. The right shows what the same object looks like when loaded into 2.81.

Exact steps for others to reproduce the error
I can't provide the CAD file but in my case, I have an object in 2.8 that was imported from a DXF object. It looks fine in 2.8. I save the object and load it into 2.81 and the image attached is what I see.

Event Timeline

Bastien Montagne (mont29) lowered the priority of this task from Needs Triage by Developer to Needs Information from User.Aug 20 2019, 7:26 PM

Please follow our submission template and guidelines, also read these tips about bug reports, and make a complete, valid bug report, with required info, precise description of the issue (only ONE issue per report!), precise steps to reproduce it, small and simple .blend and/or other files to do so if needed, etc.

If you cannot share the original file, it should be possible to either 'destroy' it to a few lines only, while still showing the issue, or to generate a dummy demo one…

I tried to simplify the object but the simplified object loads into 2.81 without a problem. That said, I'm attaching the full version. Here are the steps to reproduce.

  1. Load the attached object into Blender 2.80 official release.
  2. Keep Blender 2.80 open.
  3. Open Blender 2.81 beta.
  4. Load the attached object.
  5. Compare the object in 2.80 and 2.81. You will see missing pieces in 2.81.

The takeaway here is that something changed in 2.81 that is now affecting complex meshes. Cutting out a small part of this model in 2.80 and loading that into 2.81 will not allow you to reproduce the error. This indicates that this is a bug that won't show up in simple situations. It will only show up in real-world situations where users are dealing with complex objects.

Bastien Montagne (mont29) raised the priority of this task from Needs Information from User to Confirmed, High.

Confirmed, in Edit mode the vertices remain visible, but part of the edges are not drawing anymore... No idea why, @Clément Foucault (fclem) mind having a look? that is probably more in @Jeroen Bakker (jbakker) area, but since he is not available currently...