Update the blender addon to work with the latest version

[jayrajkharvadi]

Can we please update the blender addon to work with the latest version?
Latest working version is 3.3 . All later versions are throwing error.

This is the error from console when we try to export points from blender.

Thank you very much in advance.

Console output :

AttributeError: 'MovieTrackingCamera' object has no attribute 'principal'
Info: Total files 1 | Changed 1 | Failed 0
Info: Saved "2025-15-23_15-15_prv_101_bix_6080_plate_main_default_v001_r04.blend"
Incremental Autosave: Saved file:  D:\blender_tmp\2025-15-23_15-15_prv_101_bix_6080_plate_main_default_v001_r04.blend
Info: Saved "prv_101_bix_6080_plate_main_default_v001_r04_test_dontUse.blend"
Info: Total files 1 | Changed 1 | Failed 0
Info: Saved "2025-30-23_15-30_prv_101_bix_6080_plate_main_default_v001_r04_test_dontUse.blend"
Incremental Autosave: Saved file:  D:\blender_tmp\2025-30-23_15-30_prv_101_bix_6080_plate_main_default_v001_r04_test_dontUse.blend
Traceback (most recent call last):
  File "C:\Users\jaykha\AppData\Roaming\Blender Foundation\Blender\4.2\scripts\addons\mmSolver_blender_addon\mmsolver_2d_tracks_export.py", line 73, in execute
    data_str = uv_fmt.generate(
               ^^^^^^^^^^^^^^^^
  File "C:\Users\jaykha\AppData\Roaming\Blender Foundation\Blender\4.2\scripts\addons\mmSolver_blender_addon\uvtrack_format_blender.py", line 260, in generate
    data = get_data(context, clip, camera, tracks, frame_range)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\jaykha\AppData\Roaming\Blender Foundation\Blender\4.2\scripts\addons\mmSolver_blender_addon\uvtrack_format_blender.py", line 240, in get_data
    cam_data = get_camera_data(context, clip, cam, frame_range)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\jaykha\AppData\Roaming\Blender Foundation\Blender\4.2\scripts\addons\mmSolver_blender_addon\uvtrack_format_blender.py", line 124, in get_camera_data
    principal_x = (cam.principal[0] / res_width) - 0.5
                   ^^^^^^^^^^^^^

[david-cattermole]

Hi @jayrajkharvadi,

It looks like Blender decided to change their Python API and broke the tool.

bpy.types.MovieTrackingCamera.principal was changed to bpy.types.MovieTrackingCamera.principal_point.

https://docs.blender.org/api/3.3/bpy.types.MovieTrackingCamera.html#bpy.types.MovieTrackingCamera
https://docs.blender.org/api/3.6/bpy.types.MovieTrackingCamera.html#bpy.types.MovieTrackingCamera

I'll have a look when I can.

Thanks,
David