Assertion at bmesh_polygon.c:961 ... BM_face_is_normal_valid(f) #99542

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Jaggz H · 2022-07-08T08:06:55+02:00

Jaggz H commented

2022-07-08 08:06:55 +02:00

Debian, git build, 3.3.0 alpha from 2022-06-26 (but my own branch).

While the assertion handles with the 3d Print Toolbox addon, I am uncertain if this report belongs classified as addon related.

To reproduce, load attached blend, and click Check All (with a debug build that asserts()).

*Note: The active object was created from another object in the scene, which uses a mask (and displace) modifier to generate it from a base object (also in the scene). Its modifiers were applied to create this final "simple" mesh, but the others are available for reference.

blenderd(BM_face_triangulate+0x8e) [0x4b90327]
blenderd() [0x4cb55ce]
blenderd(BM_mesh_triangulate+0x8c1) [0x4cb606b]
blenderd(bmo_triangulate_exec+0xe3) [0x4c42844]
blenderd(BMO_op_exec+0x71) [0x4b7a3ba]
blenderd(BPy_BMO_call+0x2ff) [0x52b2937]
blenderd(_PyObject_MakeTpCall+0x88) [0x10a3fea8]
blenderd(_PyEval_EvalFrameDefault+0xa26e) [0x400ec3e]
blenderd() [0x10afe534]
blenderd(_PyEval_EvalFrameDefault+0x843a) [0x400ce0a]
blenderd() [0x10afe534]
blenderd(_PyEval_EvalFrameDefault+0x843a) [0x400ce0a]
blenderd() [0x10afe534]
blenderd(PyVectorcall_Call+0x5f) [0x10a3fb2f]
blenderd() [0x529c836]
blenderd() [0x5235060]
blenderd() [0x49e1437]
blenderd() [0x49e1a7a]
blenderd(WM_operator_name_call_ptr+0x86) [0x49e1c73]
blenderd(WM_operator_name_call_ptr_with_depends_on_cursor+0xd5) [0x49e221f]
blenderd() [0x5d9a850]
blenderd() [0x5db6d42]
blenderd() [0x49df91f]
blenderd() [0x49e586c]
blenderd() [0x49e5dee]
blenderd(wm_event_do_handlers+0x8dd) [0x49e7c13]
blenderd(WM_main+0x30) [0x49d9037]
blenderd() [0x400f768]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xea) [0x7f6e77459d0a]
blenderd(_start+0x2a) [0x400f17a]
BLI_assert failed: source/blender/bmesh/intern/bmesh_polygon.c:961, BM_face_triangulate(), at 'BM_face_is_normal_valid(f)'

mask-3dnormals.blend

Alternate example:

With 3d print toolbox enabled...
Load attached blend
Duplicate the selected object -- Has a Displace and Mirror modifier on it
Convert to mesh
3d Print toolbox -> Check All
fff.blend

Debian, git build, 3.3.0 alpha from 2022-06-26 (but my own branch). While the assertion handles with the 3d Print Toolbox addon, I am uncertain if this report belongs classified as addon related. To reproduce, load attached blend, and click Check All (with a debug build that asserts()). *Note: The active object was created from another object in the scene, which uses a mask (and displace) modifier to generate it from a base object (also in the scene). Its modifiers were applied to create this final "simple" mesh, but the others are available for reference. ``` blenderd(BM_face_triangulate+0x8e) [0x4b90327] blenderd() [0x4cb55ce] blenderd(BM_mesh_triangulate+0x8c1) [0x4cb606b] blenderd(bmo_triangulate_exec+0xe3) [0x4c42844] blenderd(BMO_op_exec+0x71) [0x4b7a3ba] blenderd(BPy_BMO_call+0x2ff) [0x52b2937] blenderd(_PyObject_MakeTpCall+0x88) [0x10a3fea8] blenderd(_PyEval_EvalFrameDefault+0xa26e) [0x400ec3e] blenderd() [0x10afe534] blenderd(_PyEval_EvalFrameDefault+0x843a) [0x400ce0a] blenderd() [0x10afe534] blenderd(_PyEval_EvalFrameDefault+0x843a) [0x400ce0a] blenderd() [0x10afe534] blenderd(PyVectorcall_Call+0x5f) [0x10a3fb2f] blenderd() [0x529c836] blenderd() [0x5235060] blenderd() [0x49e1437] blenderd() [0x49e1a7a] blenderd(WM_operator_name_call_ptr+0x86) [0x49e1c73] blenderd(WM_operator_name_call_ptr_with_depends_on_cursor+0xd5) [0x49e221f] blenderd() [0x5d9a850] blenderd() [0x5db6d42] blenderd() [0x49df91f] blenderd() [0x49e586c] blenderd() [0x49e5dee] blenderd(wm_event_do_handlers+0x8dd) [0x49e7c13] blenderd(WM_main+0x30) [0x49d9037] blenderd() [0x400f768] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xea) [0x7f6e77459d0a] blenderd(_start+0x2a) [0x400f17a] BLI_assert failed: source/blender/bmesh/intern/bmesh_polygon.c:961, BM_face_triangulate(), at 'BM_face_is_normal_valid(f)' ``` [mask-3dnormals.blend](https://archive.blender.org/developer/F13269208/mask-3dnormals.blend) Alternate example: - With 3d print toolbox enabled... - Load attached blend - Duplicate the selected object -- Has a Displace and Mirror modifier on it - Convert to mesh - 3d Print toolbox -> Check All [fff.blend](https://archive.blender.org/developer/F13283813/fff.blend)

Campbell Barton was assigned by Jaggz H

2022-07-08 08:06:55 +02:00

Jaggz H commented

2022-07-08 08:06:55 +02:00

Added subscriber: @jaggz

blender-admin commented

2022-07-08 08:06:55 +02:00

#99595 was marked as duplicate of this issue

Jesse Yurkovich commented

2022-07-08 22:35:27 +02:00

Added subscriber: @deadpin

Jesse Yurkovich commented

2022-07-08 22:35:27 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Jesse Yurkovich commented

2022-07-08 22:35:27 +02:00

The calculated face normal is different than the normal stored in the face and triggers the assert. The 3d-print addon is calling bmesh.ops.triangulate inside bmesh_check_thick_object during the failure. An odd thing to note is that triangulation works correctly when triggered through the UI.

The calculated face normal is different than the normal stored in the face and triggers the assert. The 3d-print addon is calling `bmesh.ops.triangulate` inside `bmesh_check_thick_object` during the failure. An odd thing to note is that triangulation works correctly when triggered through the UI.

Jaggz H commented

2022-07-10 23:16:06 +02:00

Another example of this one in a report that's basically a duplicate:
https://developer.blender.org/T99595

Another example of this one in a report that's basically a duplicate: https://developer.blender.org/T99595

blender-admin commented

2022-07-11 04:48:39 +02:00

This issue was referenced by blender/blender-addons@ed54c1b1c3

This issue was referenced by blender/blender-addons@ed54c1b1c3cd3a9e42d1fc8f3eec7cb2745f15fc

Campbell Barton commented

2022-07-11 04:51:25 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Campbell Barton closed this issue