Wrong result when projecting texture from camera on object with modifier. #79714

New Issue

Martijn Versteegh · 2020-08-11T17:16:14+02:00

Martijn Versteegh commented

2020-08-11 17:16:14 +02:00

System Information
Operating system: Linux-5.4.0-42-generic-x86_64-with-debian-bullseye-sid 64 Bits
Graphics card: GeForce GTX 760/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 435.21

Blender Version
Broken: version: 2.8x range, 2.91.0 Alpha, branch: master, commit date: 2020-08-11 14:14, hash: a3af59f8e3
Worked: N/A
Short description of error
I want to project a texture from the camera on an object with a mirror modifier. To do this I make sure the UV map is confined to the left half of UV space and set 'Offset U' in the mirror modifier to .5. When I project the texture from the camera in 2.83 I get a stippled result, mostly correct with black stipples.

I tried to reproduce the bug in my 2.91 alpha git debug build to investigate some more, but when trying the project in that version I get a crash (assert failed)

Exact steps for others to reproduce the errorbug-texture-project-mirror-mod.blend

(you can skip these steps if you use the attached .blend)

delete the left face of the default cube.
move the cube 1 to the right.
set the object origin to the world origin
add a mirror modifier, change 'Offset U' to .5 (in 'data')
generate an UV map (smart uv project or whatever)
got to the UV editing tab and scale the UV map with .5 in the X direction, making sure it is confined to the left half of the UV space.
click the camera object and add a background image
(steps up to now lead to the attached .blend)
Go to texture paint mode
Do 'Apply camera image' (it's in the 'options' menu at the top right of the 3d view) and choose the loaded image.
crash (or wrong stippled result in 2.83)

BLI_assert failed: blender/source/blender/blenkernel/intern/DerivedMesh.c:891, mesh_calc_modifiers(), at '(mesh_input->id.tag & LIB_TAG_COPIED_ON_WRITE_EVAL_RESULT) == 0'

**backtrace of the crash**

- 0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
- 1  0x00007ffff77e0859 in __GI_abort () at abort.c:79
- 2  0x000000000c225e2c in _BLI_assert_abort () at blender/source/blender/blenlib/intern/BLI_assert.c:50
- 3  0x00000000034c4eaa in mesh_calc_modifiers (depsgraph=0x7ffff1374908, scene=0x7ffff617fc08, ob=0x7ffff70d4a08, useDeform=1, need_mapping=false, dataMask=0x7fffffffaeb0, index=-1, use_cache=false,
allow_shared_mesh=false, r_deform=0x0, r_final=0x7fffffffae50) at blender/source/blender/blenkernel/intern/DerivedMesh.c:891
#4  0x00000000034c89a1 in mesh_create_eval_final_render (depsgraph=0x7ffff1374908, scene=0x7ffff617fc08, ob=0x7ffff70d4a08, dataMask=0x7fffffffaeb0) at blender/sou
rce/blender/blenkernel/intern/DerivedMesh.c:1995
#5  0x00000000041401a8 in proj_paint_state_mesh_eval_init (C=0x7ffff7053c08, ps=0x7fffffffaff0) at blender/source/blender/editors/sculpt_paint/paint_image_proj.c
:4040
#6  0x0000000004141734 in project_paint_begin (C=0x7ffff7053c08, ps=0x7fffffffaff0, is_multi_view=false, symmetry_flag=0 '\000') at blender/source/blender/editors/
sculpt_paint/paint_image_proj.c:4485
#7  0x00000000041466ad in texture_paint_camera_project_exec (C=0x7ffff7053c08, op=0x7fffbb5d8008) at blender/source/blender/editors/sculpt_paint/paint_image_proj.c
:6118
#8  0x00000000035eb6d6 in wm_operator_invoke (C=0x7ffff7053c08, ot=0x7ffff154ee48, event=0x0, properties=0x7fffffffd510, reports=0x0, poll_only=false, use_last_properties=true) at /home/martijn/p
rogs/blender-git/blender/source/blender/windowmanager/intern/wm_event_system.c:1308
#9  0x00000000035ebebb in wm_operator_call_internal (C=0x7ffff7053c08, ot=0x7ffff154ee48, properties=0x7fffffffd510, reports=0x0, context=6, poll_only=false, event=0x0) at /home/martijn/progs/ble
nder-git/blender/source/blender/windowmanager/intern/wm_event_system.c:1544
#10 0x00000000035ebf56 in WM_operator_name_call_ptr (C=0x7ffff7053c08, ot=0x7ffff154ee48, context=6, properties=0x7fffffffd510) at blender/source/blender/windowman
ager/intern/wm_event_system.c:1558
- 11 0x000000000428f65e in ui_apply_but_funcs_after (C=0x7ffff7053c08) at blender/source/blender/editors/interface/interface_handlers.c:904
- 12 0x00000000042aaae6 in ui_popup_handler (C=0x7ffff7053c08, event=0x7fffbb845788, userdata=0x7ffff06ec3c8) at blender/source/blender/editors/interface/interface_
handlers.c:10913
#13 0x00000000035e9abf in wm_handler_ui_call (C=0x7ffff7053c08, handler=0x7fffbb7d9068, event=0x7fffbb845788, always_pass=0) at blender/source/blender/windowmanage
r/intern/wm_event_system.c:634
#14 0x00000000035ef4b7 in wm_handlers_do_intern (C=0x7ffff7053c08, event=0x7fffbb845788, handlers=0x7fffbb8b7f18) at blender/source/blender/windowmanager/intern/wm
_event_system.c:2751
#15 0x00000000035ef92e in wm_handlers_do (C=0x7ffff7053c08, event=0x7fffbb845788, handlers=0x7fffbb8b7f18) at blender/source/blender/windowmanager/intern/wm_event_
system.c:2862
- 16 0x00000000035f0cf8 in wm_event_do_handlers (C=0x7ffff7053c08) at blender/source/blender/windowmanager/intern/wm_event_system.c:3287
- 17 0x00000000035e4b33 in WM_main (C=0x7ffff7053c08) at blender/source/blender/windowmanager/intern/wm.c:475
#18 0x00000000031552f6 in main (argc=1, argv=0x7fffffffdc38) at blender/source/creator/creator.c:546

**System Information** Operating system: Linux-5.4.0-42-generic-x86_64-with-debian-bullseye-sid 64 Bits Graphics card: GeForce GTX 760/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 435.21 **Blender Version** Broken: version: 2.8x range, 2.91.0 Alpha, branch: master, commit date: 2020-08-11 14:14, hash: `a3af59f8e3` Worked: N/A **Short description of error** I want to project a texture from the camera on an object with a mirror modifier. To do this I make sure the UV map is confined to the left half of UV space and set 'Offset U' in the mirror modifier to .5. When I project the texture from the camera in 2.83 I get a stippled result, mostly correct with black stipples. I tried to reproduce the bug in my 2.91 alpha git debug build to investigate some more, but when trying the project in that version I get a crash (assert failed) **Exact steps for others to reproduce the error**[bug-texture-project-mirror-mod.blend](https://archive.blender.org/developer/F8769865/bug-texture-project-mirror-mod.blend) (you can skip these steps if you use the attached .blend) - delete the left face of the default cube. - move the cube 1 to the right. - set the object origin to the world origin - add a mirror modifier, change 'Offset U' to .5 (in 'data') - generate an UV map (smart uv project or whatever) - got to the UV editing tab and scale the UV map with .5 in the X direction, making sure it is confined to the left half of the UV space. - click the camera object and add a background image (steps up to now lead to the attached .blend) - Go to texture paint mode - Do 'Apply camera image' (it's in the 'options' menu at the top right of the 3d view) and choose the loaded image. - crash (or wrong stippled result in 2.83) ``` BLI_assert failed: blender/source/blender/blenkernel/intern/DerivedMesh.c:891, mesh_calc_modifiers(), at '(mesh_input->id.tag & LIB_TAG_COPIED_ON_WRITE_EVAL_RESULT) == 0' **backtrace of the crash** - 0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50 - 1 0x00007ffff77e0859 in __GI_abort () at abort.c:79 - 2 0x000000000c225e2c in _BLI_assert_abort () at blender/source/blender/blenlib/intern/BLI_assert.c:50 - 3 0x00000000034c4eaa in mesh_calc_modifiers (depsgraph=0x7ffff1374908, scene=0x7ffff617fc08, ob=0x7ffff70d4a08, useDeform=1, need_mapping=false, dataMask=0x7fffffffaeb0, index=-1, use_cache=false, allow_shared_mesh=false, r_deform=0x0, r_final=0x7fffffffae50) at blender/source/blender/blenkernel/intern/DerivedMesh.c:891 #4 0x00000000034c89a1 in mesh_create_eval_final_render (depsgraph=0x7ffff1374908, scene=0x7ffff617fc08, ob=0x7ffff70d4a08, dataMask=0x7fffffffaeb0) at blender/sou rce/blender/blenkernel/intern/DerivedMesh.c:1995 #5 0x00000000041401a8 in proj_paint_state_mesh_eval_init (C=0x7ffff7053c08, ps=0x7fffffffaff0) at blender/source/blender/editors/sculpt_paint/paint_image_proj.c :4040 #6 0x0000000004141734 in project_paint_begin (C=0x7ffff7053c08, ps=0x7fffffffaff0, is_multi_view=false, symmetry_flag=0 '\000') at blender/source/blender/editors/ sculpt_paint/paint_image_proj.c:4485 #7 0x00000000041466ad in texture_paint_camera_project_exec (C=0x7ffff7053c08, op=0x7fffbb5d8008) at blender/source/blender/editors/sculpt_paint/paint_image_proj.c :6118 #8 0x00000000035eb6d6 in wm_operator_invoke (C=0x7ffff7053c08, ot=0x7ffff154ee48, event=0x0, properties=0x7fffffffd510, reports=0x0, poll_only=false, use_last_properties=true) at /home/martijn/p rogs/blender-git/blender/source/blender/windowmanager/intern/wm_event_system.c:1308 #9 0x00000000035ebebb in wm_operator_call_internal (C=0x7ffff7053c08, ot=0x7ffff154ee48, properties=0x7fffffffd510, reports=0x0, context=6, poll_only=false, event=0x0) at /home/martijn/progs/ble nder-git/blender/source/blender/windowmanager/intern/wm_event_system.c:1544 #10 0x00000000035ebf56 in WM_operator_name_call_ptr (C=0x7ffff7053c08, ot=0x7ffff154ee48, context=6, properties=0x7fffffffd510) at blender/source/blender/windowman ager/intern/wm_event_system.c:1558 - 11 0x000000000428f65e in ui_apply_but_funcs_after (C=0x7ffff7053c08) at blender/source/blender/editors/interface/interface_handlers.c:904 - 12 0x00000000042aaae6 in ui_popup_handler (C=0x7ffff7053c08, event=0x7fffbb845788, userdata=0x7ffff06ec3c8) at blender/source/blender/editors/interface/interface_ handlers.c:10913 #13 0x00000000035e9abf in wm_handler_ui_call (C=0x7ffff7053c08, handler=0x7fffbb7d9068, event=0x7fffbb845788, always_pass=0) at blender/source/blender/windowmanage r/intern/wm_event_system.c:634 #14 0x00000000035ef4b7 in wm_handlers_do_intern (C=0x7ffff7053c08, event=0x7fffbb845788, handlers=0x7fffbb8b7f18) at blender/source/blender/windowmanager/intern/wm _event_system.c:2751 #15 0x00000000035ef92e in wm_handlers_do (C=0x7ffff7053c08, event=0x7fffbb845788, handlers=0x7fffbb8b7f18) at blender/source/blender/windowmanager/intern/wm_event_ system.c:2862 - 16 0x00000000035f0cf8 in wm_event_do_handlers (C=0x7ffff7053c08) at blender/source/blender/windowmanager/intern/wm_event_system.c:3287 - 17 0x00000000035e4b33 in WM_main (C=0x7ffff7053c08) at blender/source/blender/windowmanager/intern/wm.c:475 #18 0x00000000031552f6 in main (argc=1, argv=0x7fffffffdc38) at blender/source/creator/creator.c:546 ```

Martijn Versteegh commented

2020-08-11 17:16:14 +02:00

Added subscriber: @Baardaap

blender-admin commented

2020-08-11 17:16:14 +02:00

#78198 was marked as duplicate of this issue

Philipp Oeser commented

2020-08-12 16:27:58 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-08-12 16:27:58 +02:00

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

Philipp Oeser commented

2020-08-12 16:27:58 +02:00

Can confirm.

Philipp Oeser commented

2020-08-12 16:38:26 +02:00

Could be any modifier, really by the way.

Philipp Oeser changed title from ~~Crash (in 2.91 alpha git debug build) or wrong result (in 2.83 ) when projecting texture from camera on object with mirror modifier.~~ to Crash (in 2.91 alpha git debug build) or wrong result (in 2.83 ) when projecting texture from camera on object with modifier.

2020-08-12 16:38:37 +02:00

Sybren A. Stüvel commented

2020-08-13 14:29:18 +02:00

Added subscriber: @dr.sybren

Sybren A. Stüvel self-assigned this 2020-08-13 14:29:18 +02:00

Sybren A. Stüvel commented

2020-08-13 14:29:18 +02:00

I also get a stippled result in the 2.90 branch (ada98869df):

I also get a stippled result in the 2.90 branch (ada98869df): ![image.png](https://archive.blender.org/developer/F8776886/image.png)

Philipp Oeser commented

2020-08-13 14:43:55 +02:00

It is broken throughout the 2.8 series

Sybren A. Stüvel commented

2020-08-13 21:35:05 +02:00

I think I have a fix ready, will have to do some more checking to confirm.

Sybren A. Stüvel changed title from ~~Crash (in 2.91 alpha git debug build) or wrong result (in 2.83 ) when projecting texture from camera on object with modifier.~~ to Wrong result when projecting texture from camera on object with modifier.

2020-08-14 15:26:35 +02:00

Sybren A. Stüvel commented

2020-08-17 10:10:08 +02:00

Added subscriber: @JacquesLucke

blender-admin commented

2020-08-18 15:53:28 +02:00

This issue was referenced by 5195d346f4

This issue was referenced by 5195d346f436539b71d2897c0a14021c0eff3ab3

Sybren A. Stüvel commented

2020-08-18 15:58:55 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Sybren A. Stüvel closed this issue

2020-08-18 15:58:55 +02:00

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Wrong result when projecting texture from camera on object with modifier. #79714