LookSee shows point cloud with wrong unidirectional lighting

[goddard@…]

The following bug report has been submitted:
Platform:        macOS-13.5.2-x86_64-i386-64bit
ChimeraX Version: 1.7.dev202308222255 (2023-08-22 22:55:59 UTC)
Description
Point cloud written in GLTF format is shown in LookSee Quest VR app with normals all in same direction (along z I guess).  In BabylonJS sandbox it displays correctly without directional lighting.  The file does not contain normals.  The GLTF 2.0 spec says in section 3.9.7 "Points or Lines with no NORMAL attribute SHOULD be rendered without lighting and instead use the sum of the base color value (as defined above, multiplied by COLOR_0 when present) and the emissive value."

So this seems to be a bug in the GLTFast library used by LookSee.  Possibly newer GLTFast versions fix it.

I attached a file demonstrating the problem.

Log:
Could not find tool "Tabbed Toolbar"  
UCSF ChimeraX version: 1.7.dev202308222255 (2023-08-22)  
© 2016-2023 Regents of the University of California. All rights reserved.  
How to cite UCSF ChimeraX  

> open /Users/goddard/ucsf/people/li/points.py

executed points.py  

> points openPath /Users/goddard/ucsf/people/li/243vs274_c1_fit03_scale.npy

659304 points shown, xyz ranges (-180.0, 180.0) (-89.9, 89.9) (-180.0, 180.0),
color range (0.062964, 1.0625)  

> view

> points #1 minValue 0.3 range 0.3,0.7

256957 points shown, xyz ranges (-177.4, 178.2) (-70.6, 70.7) (-175.9, 175.8),
color range (0.3, 1.0625)  

> save test.glb

Populating font family aliases took 90 ms. Replace uses of missing font family
"Sans-serif" with one that exists to avoid this cost.  




OpenGL version: 4.1 ATI-4.14.1
OpenGL renderer: AMD Radeon Pro 580 OpenGL Engine
OpenGL vendor: ATI Technologies Inc.

Python: 3.11.2
Locale: UTF-8
Qt version: PyQt6 6.3.1, Qt 6.3.1
Qt runtime version: 6.3.2
Qt platform: cocoa
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      Model Identifier: iMac18,3
      Processor Name: Quad-Core Intel Core i7
      Processor Speed: 4.2 GHz
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      L3 Cache: 8 MB
      Hyper-Threading Technology: Enabled
      Memory: 32 GB
      System Firmware Version: 515.0.0.0.0
      OS Loader Version: 577.140.2~15
      SMC Version (system): 2.41f2

Software:

    System Software Overview:

      System Version: macOS 13.5.2 (22G91)
      Kernel Version: Darwin 22.6.0
      Time since boot: 21 hours, 12 minutes

Graphics/Displays:

    Radeon Pro 580:

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      Type: GPU
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      Device ID: 0x67df
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File attachment: test.glb

test.glb​

[goddard@…]

Added by email2trac

[Tom Goddard]

The only way to fix this probably to get a fix in the GLTFast library used by LookSee.

It is a rare use (the data is Euler angle orientations seen in 500,000 cryoEM particles) and probably if the lighting was correct it still would not be useful. So not a priority to get it fixed.