Blender crashes with meshes with zero length edges #92391

System Information
Operating system: Linux-4.15.0-159-generic-x86_64-with-glibc2.27 64 Bits
Graphics card: Mesa DRI Intel(R) HD Graphics 5500 (BDW GT2) Intel Open Source Technology Center 4.6 (Core Profile) Mesa 20.0.8

Blender Version
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-10-21 10:07, hash: e79e86018e
Worked: blender-2.83.19-candidate+v283.edee6f911c81

Short description of error
Hi I report this problem that occurs in Blender 3.0 and Blender 2.93LTS, when I apply the modifiers on an object with the Booleans that I created from several cylinders joined together, a main one joined to other two cylinders with a Boolean union obtained using the collections .   

When I execute the Remesh command from the obtained object Blender goes into Crash, while if I recreate the same geometric composition in Blender 2.83 where the booleans with the collections are not supported the problem does not happen and the calculation of the Remesh command is successful and generates the new topology.

The modifier was applied to a copy of Cube with holes by using CTRL+A > Visual Geometry to Mesh

This is a report generated from this previous (https: //developer.blender.org/T92355) but which was not deemed a Remesh related bug by Sebastian Parborg, so I had to create this new report to fix this anyway.

  Thanks for your attention and I hope this issue is addressed, as this does not happen with Blender 2.83.

crash report

# Blender 3.0.0, Commit date: 2021-10-21 10:07, Hash e79e86018e38
bpy.context.space_data.show_restrict_column_viewport = True  # Property
bpy.context.space_data.show_restrict_column_select = True  # Property
bpy.data.scenes["Scene"].(null) = False  # Property
bpy.data.scenes["Scene"].(null) = False  # Property
bpy.data.scenes["Scene"].(null) = True  # Property
bpy.data.scenes["Scene"].(null) = False  # Property
bpy.data.scenes["Scene"].(null) = True  # Property
bpy.data.scenes["Scene"].(null) = True  # Property
bpy.ops.object.duplicate_move(OBJECT_OT_duplicate={"linked":False, "mode":'TRANSLATION'}, TRANSFORM_OT_translate={"value":(0, 0, 0), "orient_axis_ortho":'X', "orient_type":'GLOBAL', "orient_matrix":((0, 0, 0), (0, 0, 0), (0, 0, 0)), "orient_matrix_type":'GLOBAL', "constraint_axis":(False, False, False), "mirror":False, "use_proportional_edit":False, "proportional_edit_falloff":'SMOOTH', "proportional_size":1, "use_proportional_connected":False, "use_proportional_projected":False, "snap":False, "snap_target":'CLOSEST', "snap_point":(0, 0, 0), "snap_align":False, "snap_normal":(0, 0, 0), "gpencil_strokes":False, "cursor_transform":False, "texture_space":False, "remove_on_cancel":False, "view2d_edge_pan":False, "release_confirm":False, "use_accurate":False, "use_automerge_and_split":False})  # Operator
bpy.ops.object.duplicates_make_real()  # Operator
bpy.ops.object.convert(target='MESH')  # Operator
bpy.ops.transform.translate(value=(-4, -0, -0), orient_axis_ortho='X', orient_type='GLOBAL', orient_matrix=((1, 0, 0), (0, 1, 0), (0, 0, 1)), orient_matrix_type='GLOBAL', constraint_axis=(True, False, False), mirror=False, use_proportional_edit=False, proportional_edit_falloff='SMOOTH', proportional_size=1, use_proportional_connected=False, use_proportional_projected=False)  # Operator
bpy.ops.transform.translate(value=(1, 0, 0), orient_axis_ortho='X', orient_type='GLOBAL', orient_matrix=((1, 0, 0), (0, 1, 0), (0, 0, 1)), orient_matrix_type='GLOBAL', constraint_axis=(True, False, False), mirror=False, use_proportional_edit=False, proportional_edit_falloff='SMOOTH', proportional_size=1, use_proportional_connected=False, use_proportional_projected=False)  # Operator
Saved "retopology-experiments.blend"  # Info
bpy.context.space_data.context = 'DATA'  # Property
bpy.context.object.data.remesh_mode = 'QUAD'  # Property
bpy.data.window_managers["WinMan"].(null) = False  # Property
bpy.data.window_managers["WinMan"].(null) = True  # Property
bpy.data.window_managers["WinMan"].(null) = True  # Property
bpy.ops.object.quadriflow_remesh(use_mesh_symmetry=False, use_preserve_sharp=True, use_preserve_boundary=True)  # Operator

# backtrace
/home/pafu/Software/blender-3.0.0/blender(BLI_system_backtrace+0x20) [0xafd5480]
/home/pafu/Software/blender-3.0.0/blender() [0x10a9d6b]
/lib/x86_64-linux-gnu/libc.so.6(+0x3f040) [0x7f87e6131040]
/home/pafu/Software/blender-3.0.0/blender(AUD_Device_getRate+0x3d) [0x9d4678d]
/home/pafu/Software/blender-3.0.0/blender(BKE_sound_scene_playing+0x20) [0x1199690]
/home/pafu/Software/blender-3.0.0/blender(wm_event_do_handlers+0xa6) [0x14a8b96]
/home/pafu/Software/blender-3.0.0/blender(WM_main+0x20) [0x149edb0]
/home/pafu/Software/blender-3.0.0/blender(main+0x31e) [0xf9287e]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x7f87e6113bf7]
/home/pafu/Software/blender-3.0.0/blender() [0x10a66cc]

# Python backtrace

Exact steps for others to reproduce the error

Open .blend file
Select the cube on the left with the modifiers applied   and perform the procedure below
{nav Object Data Properties > Remesh > Quad > QuadriFlow Remesh}
Refer image for the settings

retopology-experiments.blend

This is the same file but I've remade the boolean without collection that is not supported by 2.83LTS and works fine
remesh-B2.83lts.blend

**System Information** Operating system: Linux-4.15.0-159-generic-x86_64-with-glibc2.27 64 Bits Graphics card: Mesa DRI Intel(R) HD Graphics 5500 (BDW GT2) Intel Open Source Technology Center 4.6 (Core Profile) Mesa 20.0.8 **Blender Version** Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-10-21 10:07, hash: `e79e86018e` Worked: blender-2.83.19-candidate+v283.edee6f911c81 **Short description of error** Hi I report this problem that occurs in Blender 3.0 and Blender 2.93LTS, when I apply the modifiers on an object with the Booleans that I created from several cylinders joined together, a main one joined to other two cylinders with a Boolean union obtained using the collections .    When I execute the Remesh command from the obtained object Blender goes into Crash, while if I recreate the same geometric composition in Blender 2.83 where the booleans with the collections are not supported the problem does not happen and the calculation of the Remesh command is successful and generates the new topology. - The modifier was applied to a copy of Cube with holes by using **CTRL+A** > **Visual Geometry to Mesh** This is a report generated from this previous (https: //developer.blender.org/T92355) but which was not deemed a Remesh related bug by Sebastian Parborg, so I had to create this new report to fix this anyway.   Thanks for your attention and I hope this issue is addressed, as this does not happen with Blender 2.83. **crash report** ``` # Blender 3.0.0, Commit date: 2021-10-21 10:07, Hash e79e86018e38 bpy.context.space_data.show_restrict_column_viewport = True # Property bpy.context.space_data.show_restrict_column_select = True # Property bpy.data.scenes["Scene"].(null) = False # Property bpy.data.scenes["Scene"].(null) = False # Property bpy.data.scenes["Scene"].(null) = True # Property bpy.data.scenes["Scene"].(null) = False # Property bpy.data.scenes["Scene"].(null) = True # Property bpy.data.scenes["Scene"].(null) = True # Property bpy.ops.object.duplicate_move(OBJECT_OT_duplicate={"linked":False, "mode":'TRANSLATION'}, TRANSFORM_OT_translate={"value":(0, 0, 0), "orient_axis_ortho":'X', "orient_type":'GLOBAL', "orient_matrix":((0, 0, 0), (0, 0, 0), (0, 0, 0)), "orient_matrix_type":'GLOBAL', "constraint_axis":(False, False, False), "mirror":False, "use_proportional_edit":False, "proportional_edit_falloff":'SMOOTH', "proportional_size":1, "use_proportional_connected":False, "use_proportional_projected":False, "snap":False, "snap_target":'CLOSEST', "snap_point":(0, 0, 0), "snap_align":False, "snap_normal":(0, 0, 0), "gpencil_strokes":False, "cursor_transform":False, "texture_space":False, "remove_on_cancel":False, "view2d_edge_pan":False, "release_confirm":False, "use_accurate":False, "use_automerge_and_split":False}) # Operator bpy.ops.object.duplicates_make_real() # Operator bpy.ops.object.convert(target='MESH') # Operator bpy.ops.transform.translate(value=(-4, -0, -0), orient_axis_ortho='X', orient_type='GLOBAL', orient_matrix=((1, 0, 0), (0, 1, 0), (0, 0, 1)), orient_matrix_type='GLOBAL', constraint_axis=(True, False, False), mirror=False, use_proportional_edit=False, proportional_edit_falloff='SMOOTH', proportional_size=1, use_proportional_connected=False, use_proportional_projected=False) # Operator bpy.ops.transform.translate(value=(1, 0, 0), orient_axis_ortho='X', orient_type='GLOBAL', orient_matrix=((1, 0, 0), (0, 1, 0), (0, 0, 1)), orient_matrix_type='GLOBAL', constraint_axis=(True, False, False), mirror=False, use_proportional_edit=False, proportional_edit_falloff='SMOOTH', proportional_size=1, use_proportional_connected=False, use_proportional_projected=False) # Operator Saved "retopology-experiments.blend" # Info bpy.context.space_data.context = 'DATA' # Property bpy.context.object.data.remesh_mode = 'QUAD' # Property bpy.data.window_managers["WinMan"].(null) = False # Property bpy.data.window_managers["WinMan"].(null) = True # Property bpy.data.window_managers["WinMan"].(null) = True # Property bpy.ops.object.quadriflow_remesh(use_mesh_symmetry=False, use_preserve_sharp=True, use_preserve_boundary=True) # Operator # backtrace /home/pafu/Software/blender-3.0.0/blender(BLI_system_backtrace+0x20) [0xafd5480] /home/pafu/Software/blender-3.0.0/blender() [0x10a9d6b] /lib/x86_64-linux-gnu/libc.so.6(+0x3f040) [0x7f87e6131040] /home/pafu/Software/blender-3.0.0/blender(AUD_Device_getRate+0x3d) [0x9d4678d] /home/pafu/Software/blender-3.0.0/blender(BKE_sound_scene_playing+0x20) [0x1199690] /home/pafu/Software/blender-3.0.0/blender(wm_event_do_handlers+0xa6) [0x14a8b96] /home/pafu/Software/blender-3.0.0/blender(WM_main+0x20) [0x149edb0] /home/pafu/Software/blender-3.0.0/blender(main+0x31e) [0xf9287e] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x7f87e6113bf7] /home/pafu/Software/blender-3.0.0/blender() [0x10a66cc] # Python backtrace ``` **Exact steps for others to reproduce the error** - Open .blend file - Select the cube on the left with the modifiers applied   and perform the procedure below - {nav Object Data Properties > Remesh > Quad > QuadriFlow Remesh} - Refer image for the settings ![quad-remsh-bug.png](https://archive.blender.org/developer/F11295360/quad-remsh-bug.png) [retopology-experiments.blend](https://archive.blender.org/developer/F11366006/retopology-experiments.blend) This is the same file but I've remade the boolean without collection that is not supported by 2.83LTS and works fine [remesh-B2.83lts.blend](https://archive.blender.org/developer/F11366174/remesh-B2.83lts.blend)

Added subscriber: @pafurijaz-4

Added subscriber: @mano-wii

Changed status from 'Needs Triage' to: 'Needs User Info'

I can't replicate the problem, because when I click on QuadriFlow Remesh this message appears:

QuadriFlow: The mesh needs to be manifold and have face normals that point in a consistent direction

Can you try the latest daily build? https://builder.blender.org/download/

Go to File → Defaults → Load Factory Settings and then load your file to see if you still can reproduce this issue.

If the problem persists, please give us more clear instructions on how to reproduce it from scratch.

ok I will try but with blender 2.8 works well!

Changed status from 'Needs User Info' to: 'Resolved'

I have now done a test and it also reports me that the operation cannot be performed, so I have removed the double vertices (187) and the command is executed successfully, so I consider the problem solved and Blender no longer crashes.
Anyway with Blender 2.8 it's works well without warning.

Closed as duplicate of #92355

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Blender crashes with meshes with zero length edges #92391