VR UI scene position is None

[chimerax-bug-report@…]

The following bug report has been submitted:
Platform:        Windows-10-10.0.17763
ChimeraX Version: 0.91 (2019-12-11)
Description
(Describe the actions that caused this problem to occur here)

Log:
UCSF ChimeraX version: 0.91 (2019-12-11)  
© 2016-2019 Regents of the University of California. All rights reserved.  
How to cite UCSF ChimeraX  

> open "C:\Users\Utente principale\Downloads\4-24533" format dicom

Opened CHEST CT 4, grid size 512,512,236, pixel 0.576,0.576,1.25, shown at
step 1, values int16  

> volume showOutlineBox true

> volume region all orthoplanes off

> vr true

started SteamVR rendering  
Traceback (most recent call last):  
File "C:\Program Files\ChimeraX\bin\lib\site-
packages\chimerax\core\triggerset.py", line 130, in invoke  
return self._func(self._name, data)  
File "C:\Program Files\ChimeraX\bin\lib\site-packages\chimerax\vive\vr.py",
line 662, in next_frame  
self.process_controller_events()  
File "C:\Program Files\ChimeraX\bin\lib\site-packages\chimerax\vive\vr.py",
line 690, in process_controller_events  
self.process_controller_buttons()  
File "C:\Program Files\ChimeraX\bin\lib\site-packages\chimerax\vive\vr.py",
line 717, in process_controller_buttons  
hc.process_event(e)  
File "C:\Program Files\ChimeraX\bin\lib\site-packages\chimerax\vive\vr.py",
line 2323, in process_event  
if ui.process_hand_controller_button_event(self, b, pressed, released):  
File "C:\Program Files\ChimeraX\bin\lib\site-packages\chimerax\vive\vr.py",
line 1495, in process_hand_controller_button_event  
window_xy, z_offset = panel._panel_click_position(rp.origin())  
File "C:\Program Files\ChimeraX\bin\lib\site-packages\chimerax\vive\vr.py",
line 1756, in _panel_click_position  
x,y,z = ui.scene_position.inverse() * scene_point  
AttributeError: 'NoneType' object has no attribute 'scene_position'  
  
Error processing trigger "new frame":  
AttributeError: 'NoneType' object has no attribute 'scene_position'  
  
File "C:\Program Files\ChimeraX\bin\lib\site-packages\chimerax\vive\vr.py",
line 1756, in _panel_click_position  
x,y,z = ui.scene_position.inverse() * scene_point  
  
See log for complete Python traceback.  
  




OpenGL version: 3.3.0 NVIDIA 432.00
OpenGL renderer: GeForce GTX 1060 3GB/PCIe/SSE2
OpenGL vendor: NVIDIA Corporation

[Eric Pettersen]

Duplicate of #2677