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Maniphest T70384

Knife tool erratic aiming on complex model
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Description

System Information
Operating system: Win 10 1903
Graphics card: 1080

Blender Version
Broken: 2.80 release
Worked: (optional)

Short description of error
Knife tool reacts erratically and won't cut on a complex model:

https://youtu.be/_BAuiRa3wqk

Exact steps for others to reproduce the error
Not sure if it's in my file only, but it's not a file I can share publicly, so if a developer wants to take a look, let me know and I can send it to you (It's a 70mb .FBX with 1.4 million polygons in it, imported from CAD data into Max and then exported from there).

Related Objects

Event Timeline

Robert S (eobet) created this task.Sep 30 2019, 8:50 AM
Ricardo (INeedMana) added a subscriber: Ricardo (INeedMana).Sep 30 2019, 12:48 PM

Try to hide all faces except the ones you want to make the cut, select the faces you want and then with SHIFT+H you will hide everything else, and then try to make the cut.

Philipp Oeser (lichtwerk) lowered the priority of this task from 90 to 30.Sep 30 2019, 1:13 PM
Philipp Oeser (lichtwerk) added a project: Modeling.
Philipp Oeser (lichtwerk) added a subscriber: Philipp Oeser (lichtwerk).

Hm, there is T65585: Knife Tool fail if camera is too close to the object and mouse away from object and T62285: Knife Tool produces bad geometry in certain cases (disconnected edges/vertices, overlapping faces) already, but in order to reproduce, we would really need an example .blend file.
(looks like it could be a duplicate of T65585, really)

Do you have an example you can share?
Does this happen on other zoom levels as well?
Does this also happen on a [reduced, sharable] subset of that geometry?

Robert S (eobet) added a comment.Sep 30 2019, 2:15 PM

@Ricardo (INeedMana) this workaround made the knife tool behave as normal again, thank you!

@Philipp Oeser (lichtwerk) It does not happen on any reduced version of the file, so I think you may be correct in your suspicion that it is probably a duplicate of T65585.

Bastien Montagne (mont29) closed this task as a duplicate of T65585: Knife Tool fail if camera is too close to the object and mouse away from object.Oct 14 2019, 11:47 AM