Acer 27" SpatialLabs View Pro Stereoscopic 3D Monitor openxr error

[RKrishnan@…]

started OpenXR rendering Acer Salaino XR Driver
An error occurred in drawing the scene. Redrawing graphics is now stopped to avoid a continuous stream of error messages. To restart graphics use the command "graphics restart" after changing the settings that caused the error.

'NoneType' object has no attribute 'origin'

Traceback (most recent call last):
File "C:\Program Files\ChimeraX 1.9.dev202410202351\bin\Lib\site-packages\chimerax\core\updateloop.py", line 84, in draw_new_frame
view.draw(check_for_changes = False)
File "C:\Program Files\ChimeraX 1.9.dev202410202351\bin\Lib\site-packages\chimerax\graphics\view.py", line 188, in draw
self._draw_scene(camera, drawings)
File "C:\Program Files\ChimeraX 1.9.dev202410202351\bin\Lib\site-packages\chimerax\graphics\view.py", line 231, in _draw_scene
camera.set_render_target(vnum, r)
File "C:\Program Files\ChimeraX 1.9.dev202410202351\bin\Lib\site-packages\chimerax\vive\xr.py", line 941, in set_render_target
self._start_rendering()
File "C:\Program Files\ChimeraX 1.9.dev202410202351\bin\Lib\site-packages\chimerax\vive\xr.py", line 799, in _start_rendering
self._update_camera_position()
File "C:\Program Files\ChimeraX 1.9.dev202410202351\bin\Lib\site-packages\chimerax\vive\xr.py", line 803, in _update_camera_position
H = self._xr.headset_pose() # head to room coordinates.
^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Program Files\ChimeraX 1.9.dev202410202351\bin\Lib\site-packages\chimerax\vive\openxr.py", line 730, in headset_pose
shift = 0.5 * (e1.origin() - e0.origin())
^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'origin'


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[Eric Pettersen]

Reported by Krishnan Raman

[Tom Goddard]

Thanks for the report. This error is because the Acer stereo display OpenXR driver is not giving the viewing position and the ChimeraX OpenXR code has never been tested in that situation since VR headsets always give the viewing position. I'll see if I can fix this error and let you know when to try a new daily build.

I suspect the trouble is if the Acer display eye tracking is not tracking your eyes then it report no viewing position. If ChimeraX could handle that without an error, then it may work once eye tracking engages.

[Tom Goddard]

I put in a fix for this error. Give the ChimeraX daily build dated Oct 21, 2024 or newer a try and let's see where the next problem is. I don't have one of these Acer stereo displays with eye tracking so it is impossible for me to predict how it uses OpenXR, but perhaps we can get ChimeraX to work with it.