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Maniphest T43716

Regression: Mask Modifier Creates "Web" of Phantom Lines
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Description

System Information
64bit Manjaro Linux, kernel 3.14.39
CPU: AMD Phenom II 970 Deneb quad-core
GPU: nVidia GTX 650 Ti, driver 343.36

Blender Version
Broken: 2.73-dev 0294327
Worked: 2.73 b4d8fb5

Short description of error
When the Mask modifier is used to selectively eliminate the geometry of a mesh, a ton of lines appears in the viewport when the object is selected, but they do not seem to conform to any known geometry, and do not show up in rendering. Mostly they seem to connect gaps between pieces of the mesh, or connect to the scene center.

Minor bug, but annoying.

Exact steps for others to reproduce the error
This .blend file repros the issue when opened:

MaskModifierSpazout.blend109 KBDownload

Revisions and Commits

rB Blender
rB839a6b22d6c3 Fix T43716 regression in mask modifier - edges could access out of bounds…

Related Objects

Event Timeline

Zauber Paracelsus (zauberexonar) created this task.Feb 18 2015, 3:37 AM
Zauber Paracelsus (zauberexonar) raised the priority of this task from to 90.
Zauber Paracelsus (zauberexonar) updated the task description. (Show Details)
Zauber Paracelsus (zauberexonar) added a project: BF Blender.
Zauber Paracelsus (zauberexonar) edited a custom field.
Zauber Paracelsus (zauberexonar) added a subscriber: Zauber Paracelsus (zauberexonar).
Julian Eisel (Severin) lowered the priority of this task from 90 to 30.Feb 18 2015, 3:36 PM
Julian Eisel (Severin) added a subscriber: Julian Eisel (Severin).

Also something I can't reproduce here (OpenSuse 64Bit). Could you test again with the softwaregl? Really looks like a driver issue.

Zauber Paracelsus (zauberexonar) added a comment.Feb 18 2015, 3:59 PM

Still repros with softwaregl. However, when I do a factory reset (by renaming the settings folder), the file actually crashes when opened, both with normal blender and with softwaregl. The crash doesn't occur on my debug build though, which is about a week older than the buildbot build I had used.

I have recompiled the debug build against bf0a001e and ran it. Here is the backtrace:

T43716_backtrace.txt3 KBDownload

Julian Eisel (Severin) added a subscriber: Antonis Ryakiotakis (psy-fi).Feb 18 2015, 4:15 PM

Mhh starting an earlyer 2.73 build works fine (as I did in my last test), using master crashes on startup for me too, using master with a debug build shows the issue. Pretty weird but looks like an OGL issue. We need @Antonis Ryakiotakis (psy-fi)!

Julian Eisel (Severin) assigned this task to Antonis Ryakiotakis (psy-fi).Feb 18 2015, 4:16 PM
Julian Eisel (Severin) raised the priority of this task from 30 to 50.
Zauber Paracelsus (zauberexonar) added a comment.Feb 18 2015, 4:23 PM

Curiously, something with my blender configuration prevents the crash: it only repros for me with a factory reset, the opposite of what I was seeing in T43714.

In case it is helpful, here is a copy of my blender configuration:

2.73.tar.gz214 KBDownload

Antonis Ryakiotakis (psy-fi) changed the task status from Unknown Status to Resolved.Feb 18 2015, 5:59 PM
Antonis Ryakiotakis (psy-fi) added a commit: rB839a6b22d6c3: Fix T43716 regression in mask modifier - edges could access out of bounds….

Closed by commit rB839a6b22d6c3.