<Mitsuba blender add on error>: <Cannot install Mitsuba add-on in blender>

[Pooja-M9]

Cannot install mitsuba add on for blender

Bug Description While trying to install mitsuba add-on in blender, i am getting following error:

Read prefs: C:\Users\MOH80574\AppData\Roaming\Blender Foundation\Blender\3.5\config\userpref.blend Exception in module register(): C:\Users\MOH80574\AppData\Roaming\Blender Foundation\Blender\3.5\scripts\addons\mitsuba-blender__init.py Traceback (most recent call last): File "C:\Program Files\Blender Foundation\Blender 3.5\3.5\python\lib\site-packages\mitsuba\init.py", line 49, in _import('mitsuba.mitsuba_ext') File "C:\Program Files\Blender Foundation\Blender 3.5\3.5\python\lib\importlib\init__.py", line 126, in import_module return _bootstrap._gcd_import(name[level:], package, level) File "", line 1050, in _gcd_import File "", line 1027, in _find_and_load File "", line 1006, in _find_and_load_unlocked File "", line 674, in _load_unlocked File "", line 571, in module_from_spec File "", line 1176, in create_module File "", line 241, in _call_with_frames_removed ImportError: DLL load failed while importing mitsuba_ext: The specified procedure could not be found.

The above exception was the direct cause of the following exception:

Traceback (most recent call last): File "C:\Program Files\Blender Foundation\Blender 3.5\3.5\scripts\modules\addon_utils.py", line 369, in enable mod.register() File "C:\Users\MOH80574\AppData\Roaming\Blender Foundation\Blender\3.5\scripts\addons\mitsuba-blender__init.py", line 301, in register if try_register_mitsuba(context): File "C:\Users\MOH80574\AppData\Roaming\Blender Foundation\Blender\3.5\scripts\addons\mitsuba-blender__init__.py", line 55, in try_register_mitsuba could_init_mitsuba = init_mitsuba(context) File "C:\Users\MOH80574\AppData\Roaming\Blender Foundation\Blender\3.5\scripts\addons\mitsuba-blender__init__.py", line 35, in init_mitsuba import mitsuba File "C:\Program Files\Blender Foundation\Blender 3.5\3.5\python\lib\site-packages\mitsuba\init__.py", line 69, in raise exc ImportError: The 'mitsuba' native modules could not be imported. You're likely trying to use Mitsuba within a Python binary (C:\Program Files\Blender Foundation\Blender 3.5\3.5\python\bin\python.exe) that is different from the one for which the native module was compiled (C:\Users\runneradmin\AppData\Local\Temp\cibw-run-rwptb42b\cp310-win_amd64\build\venv\Scripts\python.exe).

To Reproduce Steps to reproduce the behavior:

1. Download blender and mitsuba add on from these two links - https://www.blender.org/download/releases/3-5/ and https://github.com/mitsuba-renderer/mitsuba-blender
2. Open blender and click on edit -> preferences -> install -> mitsuba zip file
3. Error is popped up when activating the add-on

Expected behavior While activating, mitsuba add-on should be activated without any issue

Environment (please complete the following information):

• OS: [Windows]
• Blender Version: [3.5]
• Add-on Version: [latest]

[bathal1]

Did you try to link the addon to a local installation of Mitsuba, or did you install it with pip through blender ?

[Pooja-M9]

I dont have Mitsuba installed locally. Steps i followed are: 1) Installed Blender 3.5 2) Downloaded zip file of Mitsuba Blender add on from here https://github.com/mitsuba-renderer/mitsuba-blender 3) Inside Blender add-on option, i clicked on 'Install' and uploaded zip file of mitsuba downloaded in previous step.

Is there something else i should have downloaded for this to work? Sorry i am not experienced with Blender or mitsuba.

[bathal1]

Did you download the mitsuba-blender.zip file from the Releases page ?

[bathal1]

The addon does not have a field for a mitsuba zip file. You can either let blender's python install mitsuba through pip by clicking on Install dependencies (I recommend doing that) or point to a local mitsuba build folder in Advanced settings

[Pooja-M9]

I have downloaded mitsuba-blender.zip file from the Releases page.

Install dependencies is somehow not working for me (that option is disabled) - i have attached in figure. Could you tell me where would be the location of local mitsuba build folder? Is it the zip file location?

[bathal1]

Could you try reinstalling the addon from scratch, and see if the option is available then ? To uninstall the addon, click on "remove". You can then reload blender and install the addon from the zip file as you did before.

[Pooja-M9]

I have removed the zip file and then reinstalled it again. Now i cant see the dependencies option at all.

[bathal1]

You did not activate the addon. You need to tick the checkbox next to the addon's name.

[Pooja-M9]

When i click on the activate button, error pops up as i showed before -

[bathal1]

Can you please copy the full error log here? You should be able to find it in the console output. You will likely first need to toggle the console : Window -> Toggle System Console. If there is no error message, you might need to redo the addon instal procedure to trigger it.

[Pooja-M9]

Hello,

I have copied the full error log as you advised:

Read prefs: C:\Users\MOH80574\AppData\Roaming\Blender Foundation\Blender\3.5\config\userpref.blend Exception in module register(): C:\Users\MOH80574\AppData\Roaming\Blender Foundation\Blender\3.5\scripts\addons\mitsuba-blender__init.py Traceback (most recent call last): File "C:\Program Files\Blender Foundation\Blender 3.5\3.5\python\lib\site-packages\mitsuba\init.py", line 49, in _import('mitsuba.mitsuba_ext') File "C:\Program Files\Blender Foundation\Blender 3.5\3.5\python\lib\importlib\init__.py", line 126, in import_module return _bootstrap._gcd_import(name[level:], package, level) File "", line 1050, in _gcd_import File "", line 1027, in _find_and_load File "", line 1006, in _find_and_load_unlocked File "", line 674, in _load_unlocked File "", line 571, in module_from_spec File "", line 1176, in create_module File "", line 241, in _call_with_frames_removed ImportError: DLL load failed while importing mitsuba_ext: The specified procedure could not be found.

The above exception was the direct cause of the following exception:

Traceback (most recent call last): File "C:\Program Files\Blender Foundation\Blender 3.5\3.5\scripts\modules\addon_utils.py", line 369, in enable mod.register() File "C:\Users\MOH80574\AppData\Roaming\Blender Foundation\Blender\3.5\scripts\addons\mitsuba-blender__init.py", line 301, in register if try_register_mitsuba(context): File "C:\Users\MOH80574\AppData\Roaming\Blender Foundation\Blender\3.5\scripts\addons\mitsuba-blender__init__.py", line 67, in try_register_mitsuba could_init_mitsuba = init_mitsuba(context) File "C:\Users\MOH80574\AppData\Roaming\Blender Foundation\Blender\3.5\scripts\addons\mitsuba-blender__init__.py", line 35, in init_mitsuba import mitsuba File "C:\Program Files\Blender Foundation\Blender 3.5\3.5\python\lib\site-packages\mitsuba\init__.py", line 69, in raise exc ImportError: The 'mitsuba' native modules could not be imported. You're likely trying to use Mitsuba within a Python binary (C:\Program Files\Blender Foundation\Blender 3.5\3.5\python\bin\python.exe) that is different from the one for which the native module was compiled (C:\Users\runneradmin\AppData\Local\Temp\cibw-run-rwptb42b\cp310-win_amd64\build\venv\Scripts\python.exe).

Exception in module register(): C:\Users\MOH80574\AppData\Roaming\Blender Foundation\Blender\3.5\scripts\addons\mitsuba-blender__init.py Traceback (most recent call last): File "C:\Program Files\Blender Foundation\Blender 3.5\3.5\python\lib\site-packages\mitsuba\init.py", line 49, in _import('mitsuba.mitsuba_ext') File "C:\Program Files\Blender Foundation\Blender 3.5\3.5\python\lib\importlib\init__.py", line 126, in import_module return _bootstrap._gcd_import(name[level:], package, level) File "", line 1050, in _gcd_import File "", line 1027, in _find_and_load File "", line 1006, in _find_and_load_unlocked File "", line 674, in _load_unlocked File "", line 571, in module_from_spec File "", line 1176, in create_module File "", line 241, in _call_with_frames_removed ImportError: DLL load failed while importing mitsuba_ext: The specified procedure could not be found.

The above exception was the direct cause of the following exception:

Traceback (most recent call last): File "C:\Program Files\Blender Foundation\Blender 3.5\3.5\scripts\modules\addon_utils.py", line 369, in enable mod.register() File "C:\Users\MOH80574\AppData\Roaming\Blender Foundation\Blender\3.5\scripts\addons\mitsuba-blender__init.py", line 301, in register if try_register_mitsuba(context): File "C:\Users\MOH80574\AppData\Roaming\Blender Foundation\Blender\3.5\scripts\addons\mitsuba-blender__init__.py", line 67, in try_register_mitsuba could_init_mitsuba = init_mitsuba(context) File "C:\Users\MOH80574\AppData\Roaming\Blender Foundation\Blender\3.5\scripts\addons\mitsuba-blender__init__.py", line 35, in init_mitsuba import mitsuba File "C:\Program Files\Blender Foundation\Blender 3.5\3.5\python\lib\site-packages\mitsuba\init__.py", line 69, in raise exc ImportError: The 'mitsuba' native modules could not be imported. You're likely trying to use Mitsuba within a Python binary (C:\Program Files\Blender Foundation\Blender 3.5\3.5\python\bin\python.exe) that is different from the one for which the native module was compiled (C:\Users\runneradmin\AppData\Local\Temp\cibw-run-rwptb42b\cp310-win_amd64\build\venv\Scripts\python.exe).

[Lumi0706]

Hello, I also encountered this problem, is there a solution now?

[Pooja-M9]

Unfortunately, it hasnt been resolved till now

[Mysakshi2104]

I am facing the same issue.....is this resolved??

[bathal1]

Closing this issue, as it seems to be a duplicate of #61. Please see the discussion there.