Blender crashes when OpenSubdiv is enabled upon deselect+reselect of subdivided object #47507

New Issue

Annetta Brisby · 2016-02-20T20:50:29+01:00

Annetta Brisby commented

2016-02-20 20:50:29 +01:00

System Information
Windows 7 64bit, Intel HD Graphics 4000

Blender Version
Broken: 2.76 da81227 (2.77 test 2)

Short description of error

Exact steps for others to reproduce the error

Set "OpenSubdiv compute" in User Preferences/Files to CPU
Subdivide the default cube
Check "Use OpenSubdiv" in the SubSurf modifier options
In the 3D viewport, select another object, then reselect the subdivided object

bloop.blend

**System Information** Windows 7 64bit, Intel HD Graphics 4000 **Blender Version** Broken: 2.76 da81227 (2.77 test 2) **Short description of error** **Exact steps for others to reproduce the error** - Set "OpenSubdiv compute" in User Preferences/Files to CPU - Subdivide the default cube - Check "Use OpenSubdiv" in the SubSurf modifier options - In the 3D viewport, select another object, then reselect the subdivided object [bloop.blend](https://archive.blender.org/developer/F284311/bloop.blend)

Annetta Brisby commented

2016-02-20 20:50:30 +01:00

Changed status to: 'Open'

Annetta Brisby commented

2016-02-20 20:50:30 +01:00

Added subscriber: @AVBrats

Campbell Barton commented

2016-02-22 13:44:13 +01:00

Added subscriber: @ideasman42

Campbell Barton commented

2016-02-22 13:44:13 +01:00

Can't redo this error, is this some well known bug on Intel?

Sergey Sharybin commented

2016-02-23 14:19:01 +01:00

Added subscriber: @Sergey

Sergey Sharybin commented

2016-02-23 14:19:01 +01:00

Can't redo the issue as well. Please make sure you've got all latest updates installed and that you're using the latest video driver from Intel download center and see if it resolves the issue.

In any case, it's most likely an OpenGL bug.

Can't redo the issue as well. Please make sure you've got all latest updates installed and that you're using the latest video driver from Intel download center and see if it resolves the issue. In any case, it's most likely an OpenGL bug.

Bastien Montagne commented

2016-03-01 14:53:54 +01:00

Added subscriber: @mont29

Bastien Montagne commented

2016-03-01 14:53:54 +01:00

Changed status from 'Open' to: 'Archived'

Bastien Montagne closed this issue

2016-03-01 14:53:54 +01:00

Bastien Montagne self-assigned this 2016-03-01 14:53:54 +01:00

Bastien Montagne commented

2016-03-01 14:53:54 +01:00

No news since one week…

Annetta Brisby commented

2016-03-02 01:01:51 +01:00

Hey y'all, sorry for the late reply. I haven't really been using Blender at all in a week or two and I'd even uninstalled it. But I just downloaded & installed Blender 2.77 RC1 (yay an actual installer!) and I have Intel's newest drivers for my system (Intel HD Graphics 4000 driver 10.18.10.4358 12/21/2015). The error still occurs. I'm also on Windows 10 now. It occurs whether OpenSubdiv Calculate is set to CPU or OpenMP. Running as administrator doesn't help either.

To repeat how to redo the bug (I'm assuming this happens on Intel HD Graphics 4000):

Set OpenSubdiv Compute to either CPU or OpenMP
Subdivide the default cube or any object
Check "Use OpenSubdiv" under the Subsurf modifier options
(In the 3D Viewport) Unselect the OpenSubdiv subdivided object and then select the object

Hey y'all, sorry for the late reply. I haven't really been using Blender at all in a week or two and I'd even uninstalled it. But I just downloaded & installed Blender 2.77 RC1 (yay an actual installer!) and I have Intel's newest drivers for my system (Intel HD Graphics 4000 driver 10.18.10.4358 12/21/2015). The error still occurs. I'm also on Windows 10 now. It occurs whether OpenSubdiv Calculate is set to CPU or OpenMP. Running as administrator doesn't help either. To repeat how to redo the bug (I'm assuming this happens on Intel HD Graphics 4000): - Set OpenSubdiv Compute to either CPU or OpenMP - Subdivide the default cube or any object - Check "Use OpenSubdiv" under the Subsurf modifier options - (In the 3D Viewport) Unselect the OpenSubdiv subdivided object and then select the object

Bastien Montagne commented

2016-03-02 10:36:56 +01:00

Can you please try to place this dll next to your blender.exe (software OGL, will be slow, but will show whether this is a driver issue or not)?

Can you please try to place [this dll](http://download.blender.org/ftp/sergey/softwaregl/win64/opengl32.dll) next to your blender.exe (software OGL, will be slow, but will show whether this is a driver issue or not)?

Annetta Brisby commented

2016-03-02 13:35:06 +01:00

With that done, Blender doesn't crash anymore! But OpenSubdiv Compute (User Preferences->System) doesn't have any options now, and when I check OpenSubdiv in the Subsurf modifier options, it says that it's disabled in the user preferences.

Bastien Montagne commented

2016-03-02 14:26:43 +01:00

Changed status from 'Archived' to: 'Open'

Bastien Montagne reopened this issue

2016-03-02 14:26:43 +01:00

Bastien Montagne commented

2016-03-02 14:26:43 +01:00

Ack… right, software OGL is not modern enough to be supported by OpenSubdiv :/

Will reopen in case @Sergey has more/better ideas here, but afraid we won’t be able to do much if we cannot reproduce the issue :|

Oh, maybe you can try tweaking OGL settings in UserPreferences, system tab (things like select method, draw method, multisample, anisotropic filtering, etc.), and/or try tweaking your GPU driver settings (e.g. try different values between 'performance' and 'quality' if you have such slider, etc.).

Ack… right, software OGL is not modern enough to be supported by OpenSubdiv :/ Will reopen in case @Sergey has more/better ideas here, but afraid we won’t be able to do much if we cannot reproduce the issue :| Oh, maybe you can try tweaking OGL settings in UserPreferences, system tab (things like select method, draw method, multisample, anisotropic filtering, etc.), and/or try tweaking your GPU driver settings (e.g. try different values between 'performance' and 'quality' if you have such slider, etc.).

Annetta Brisby commented

2016-03-02 16:19:16 +01:00

Okay, the last few minutes I've tried several values for the display options in User Preferences->System, the OpenGL render options from the top Render menu, all of the Shading/Display options in the 3D Viewport N-menu. I've also tried all of the possible values in Intel's 3D display settings.

There are only two options that have prevented the error from occurring (but aren't necessarily satisfactory workarounds):

Turning off the viewport visibility of the Subsurf modifier. You can still see the OpenSubdiv subsurf when you hit F12 to render, but you have to turn OpenSubdiv off in order for Subsurf visibility to function in the 3D viewport.
Activating a matcap. When this was on, activating OpenSubdiv on a model's Subsurf modifier would make it invisible. Only a selection outline wireframe was visible. (Screenshot attached) When Outline Selected is off in this state, the model is completely invisible.

Okay, the last few minutes I've tried several values for the display options in User Preferences->System, the OpenGL render options from the top Render menu, all of the Shading/Display options in the 3D Viewport N-menu. I've also tried all of the possible values in Intel's 3D display settings. There are only two options that have prevented the error from occurring (but aren't necessarily satisfactory workarounds): - Turning off the viewport visibility of the Subsurf modifier. You can still see the OpenSubdiv subsurf when you hit F12 to render, but you have to turn OpenSubdiv off in order for Subsurf visibility to function in the 3D viewport. - Activating a matcap. When this was on, activating OpenSubdiv on a model's Subsurf modifier would make it invisible. Only a selection outline wireframe was visible. (Screenshot attached) When Outline Selected is off in this state, the model is completely invisible. ![blenderopensubdivmatcap1.png](https://archive.blender.org/developer/F286666/blenderopensubdivmatcap1.png)

Bastien Montagne commented

2016-03-12 15:39:54 +01:00

Note that opensubdiv is only used for viewport, regular subsurf is always used for render.

This totally sounds like driver issue, so afraid we cannot do much about it, will let @Sergey decide though.

Note that opensubdiv is only used for viewport, regular subsurf is always used for render. This totally sounds like driver issue, so afraid we cannot do much about it, will let @Sergey decide though.

Bastien Montagne removed their assignment 2016-03-12 15:40:09 +01:00

Sergey Sharybin was assigned by Bastien Montagne

2016-03-12 15:40:09 +01:00

Sergey Sharybin commented

2016-03-15 12:15:31 +01:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2016-03-15 12:15:31 +01:00

Sergey Sharybin commented

2016-03-15 12:15:31 +01:00

yes, after all this discussion indeed seems it'a an OpenGL issue. There are some bigger changes planned to OpenSubdiv+OpenGL in Blender, for until those are done would consider it a TODO to stabilize all OpenGL flavors and making it more robust checks about which configurations are supported.

Thanks for the report anyway!

yes, after all this discussion indeed seems it'a an OpenGL issue. There are some bigger changes planned to OpenSubdiv+OpenGL in Blender, for until those are done would consider it a TODO to stabilize all OpenGL flavors and making it more robust checks about which configurations are supported. Thanks for the report anyway!

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Blender crashes when OpenSubdiv is enabled upon deselect+reselect of subdivided object #47507