"tape measure" mouse mode: cannot unpack non-iterable NoneType object

[Scooter Morris]

The following bug report has been submitted:
Platform:        Linux-5.3.5-200.fc30.x86_64-x86_64-with-fedora-30-Thirty
ChimeraX Version: 0.91 (2019-10-29)
Description
Trying to use the tape measure mode.  Got traceback when I do a right-click.

Log:
UCSF ChimeraX version: 0.91 (2019-10-29)  
© 2016-2019 Regents of the University of California. All rights reserved.  
How to cite UCSF ChimeraX  

> open /tmp/4-24533 format dicom

Missing filename suffix /tmp/4-24533  

> open 1hgg format mmCIF fromDatabase pdb

Summary of feedback from opening 1hgg fetched from pdb  
---  
warnings | Atom H1 is not in the residue template for GLN #1 in chain A  
Atom H1 is not in the residue template for GLY #1 in chain B  
Atom H1 is not in the residue template for GLN #1 in chain C  
Atom H1 is not in the residue template for GLY #1 in chain D  
Atom H1 is not in the residue template for GLN #1 in chain E  
1 messages similar to the above omitted  
  
1hgg title:  
Binding of influenza virus hemagglutinin to analogs of its cell-surface
receptor, sialic acid: analysis by proton nuclear magnetic resonance
spectroscopy and X-ray crystallography [more info...]  
  
Chain information for 1hgg #1  
---  
Chain | Description  
A C E | hemagglutinin, chain HA1  
B D F | hemagglutinin, chain HA2  
  
Non-standard residues in 1hgg #1  
---  
BGC — β-D-glucose  
BMA — β-D-mannose  
GAL — β-D-galactose  
NAG — N-acetyl-D-glucosamine  
SIA — O-sialic acid  
  
  

> ui mousemode rightMode "tape measure"

> close

> open /tmp/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  

> ui mousemode rightMode "tape measure"

Traceback (most recent call last):  
File "/usr/local/chimerax/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 463, in <lambda>  
gw.mousePressEvent = lambda e, s=self: s._dispatch_mouse_event(e,
"mouse_down")  
File "/usr/local/chimerax/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 392, in
_dispatch_mouse_event  
f(MouseEvent(event, modifiers=modifiers))  
File "/usr/local/chimerax/lib/python3.7/site-
packages/chimerax/atomic/tape_measure/tape.py", line 32, in mouse_down  
p, v = self._picked_point(event)  
File "/usr/local/chimerax/lib/python3.7/site-
packages/chimerax/atomic/tape_measure/tape.py", line 132, in _picked_point  
pm, vm = method(xyz1, xyz2)  
File "/usr/local/chimerax/lib/python3.7/site-
packages/chimerax/atomic/tape_measure/tape.py", line 170, in
_volume_maximum_point  
sxyz, v = first_volume_maxima(xyz1, xyz2, vlist)  
TypeError: cannot unpack non-iterable NoneType object  
  
TypeError: cannot unpack non-iterable NoneType object  
  
File "/usr/local/chimerax/lib/python3.7/site-
packages/chimerax/atomic/tape_measure/tape.py", line 170, in
_volume_maximum_point  
sxyz, v = first_volume_maxima(xyz1, xyz2, vlist)  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File "/usr/local/chimerax/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 463, in <lambda>  
gw.mousePressEvent = lambda e, s=self: s._dispatch_mouse_event(e,
"mouse_down")  
File "/usr/local/chimerax/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 392, in
_dispatch_mouse_event  
f(MouseEvent(event, modifiers=modifiers))  
File "/usr/local/chimerax/lib/python3.7/site-
packages/chimerax/atomic/tape_measure/tape.py", line 32, in mouse_down  
p, v = self._picked_point(event)  
File "/usr/local/chimerax/lib/python3.7/site-
packages/chimerax/atomic/tape_measure/tape.py", line 132, in _picked_point  
pm, vm = method(xyz1, xyz2)  
File "/usr/local/chimerax/lib/python3.7/site-
packages/chimerax/atomic/tape_measure/tape.py", line 170, in
_volume_maximum_point  
sxyz, v = first_volume_maxima(xyz1, xyz2, vlist)  
TypeError: cannot unpack non-iterable NoneType object  
  
TypeError: cannot unpack non-iterable NoneType object  
  
File "/usr/local/chimerax/lib/python3.7/site-
packages/chimerax/atomic/tape_measure/tape.py", line 170, in
_volume_maximum_point  
sxyz, v = first_volume_maxima(xyz1, xyz2, vlist)  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File "/usr/local/chimerax/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 463, in <lambda>  
gw.mousePressEvent = lambda e, s=self: s._dispatch_mouse_event(e,
"mouse_down")  
File "/usr/local/chimerax/lib/python3.7/site-
packages/chimerax/mouse_modes/mousemodes.py", line 392, in
_dispatch_mouse_event  
f(MouseEvent(event, modifiers=modifiers))  
File "/usr/local/chimerax/lib/python3.7/site-
packages/chimerax/atomic/tape_measure/tape.py", line 32, in mouse_down  
p, v = self._picked_point(event)  
File "/usr/local/chimerax/lib/python3.7/site-
packages/chimerax/atomic/tape_measure/tape.py", line 132, in _picked_point  
pm, vm = method(xyz1, xyz2)  
File "/usr/local/chimerax/lib/python3.7/site-
packages/chimerax/atomic/tape_measure/tape.py", line 170, in
_volume_maximum_point  
sxyz, v = first_volume_maxima(xyz1, xyz2, vlist)  
TypeError: cannot unpack non-iterable NoneType object  
  
TypeError: cannot unpack non-iterable NoneType object  
  
File "/usr/local/chimerax/lib/python3.7/site-
packages/chimerax/atomic/tape_measure/tape.py", line 170, in
_volume_maximum_point  
sxyz, v = first_volume_maxima(xyz1, xyz2, vlist)  
  
See log for complete Python traceback.  
  




OpenGL version: 3.3.0 NVIDIA 430.40
OpenGL renderer: GeForce GTX 750 Ti/PCIe/SSE2
OpenGL vendor: NVIDIA Corporation

[Scooter Morris]

On 10/29/19 2:24 PM, ChimeraX wrote:

Sorry, I realized after reporting this that tape measure isn't yet 
supported for DiCOM.

-- scooter

[Tom Goddard]

Fixed.

Yes tape measure does support DICOM and all volume formats. This error happens when a volume is using image style display and has never shown a surface. It was trying to use the surface level to know how deep in the image to pick. Sorry, I never tested this case of a volume with no surface.

[Scooter Morris]

Guess that shows us the value of the least knowledgeable person in the 
lab writing the progress report :-)

-- scooter

On 10/29/19 2:37 PM, ChimeraX wrote: