Multires may "forget" external .btx displacements and later overwrite them #37541

New Issue

xxxxx xxxxx · 2013-11-19T18:55:19+01:00

xxxxx xxxxx commented

2013-11-19 18:55:19 +01:00

System Information
Arch x64

Blender Version
Broken: Blender 2.69 r95d3286

Short description of error
In a newly opened .blend file, Multires modifiers appear to lazily load external displacement files if the viewport level is 0 or viewport visibility is disabled, then load them if those settings are changed or if sculpt mode is entered. However, if edit mode is entered on a mesh before its .btx displacements are loaded, the displacements appear to be lost when multires is next enabled, and definitely will be lost if the .blend is saved once this happens

AFAICT this does not occur with regular "packed" displacements, nor with .btx files that have been loaded prior to entering edit mode

Exact steps for others to reproduce the error

start with any mesh
add multires and subdivide a few times
enter sculpt mode and do some sculpting
exit sculpt mode
use multires' Save External and save the .btx
set either multires' preview level to 0, or disable its viewport visibility
save and close blender
reopen the .blend file.
before touching multires, toggle edit mode
reverse what you did for step 6
displacements have not loaded. inspecting the .btx file in a hex editor implies the displacements are still intact
save. inspecting the .btx file again, the displacements have been zero'd out

the attached .blend is ready to go at step 8, and has viewport visiblity for multires disabled

**System Information** Arch x64 **Blender Version** Broken: Blender 2.69 r95d3286 **Short description of error** In a newly opened .blend file, Multires modifiers appear to lazily load external displacement files if the viewport level is 0 or viewport visibility is disabled, then load them if those settings are changed or if sculpt mode is entered. However, if edit mode is entered on a mesh before its .btx displacements are loaded, the displacements appear to be lost when multires is next enabled, and definitely **will** be lost if the .blend is saved once this happens AFAICT this does not occur with regular "packed" displacements, nor with .btx files that have been loaded prior to entering edit mode **Exact steps for others to reproduce the error** 1. start with any mesh 2. add multires and subdivide a few times 3. enter sculpt mode and do some sculpting 4. exit sculpt mode 5. use multires' Save External and save the .btx 6. set either multires' preview level to 0, or disable its viewport visibility 7. save and close blender 8. reopen the .blend file. 9. before touching multires, toggle edit mode 10. reverse what you did for step 6 11. displacements have not loaded. inspecting the .btx file in a hex editor implies the displacements are still intact 12. save. inspecting the .btx file again, the displacements have been zero'd out the attached .blend is ready to go at step 8, and has viewport visiblity for multires disabled

xxxxx xxxxx commented

2013-11-19 18:55:19 +01:00

Changed status to: 'Open'

xxxxx xxxxx commented

2013-11-19 18:55:19 +01:00

Added subscriber: @zzyxz

xxxxx xxxxx commented

2013-11-19 18:56:36 +01:00

at least... i THINK i attached the files. there didn't seem to be any indication that it actually did anything

EDIT: apparently not... let's try this again

at least... i THINK i attached the files. there didn't seem to be any indication that it actually did anything EDIT: apparently not... let's try this again

Brecht Van Lommel self-assigned this 2013-11-22 20:34:54 +01:00

Brecht Van Lommel commented

2013-11-22 20:35:23 +01:00

No time yet to confirm the problem but assigning to self to look into later.