id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	blockedby	blocking	notify_on_close	platform	project
7693	VR flickers with Quest 2 and AirLink or link cable	Tom Goddard	Tom Goddard	"The Quest 2 headset exhibits jitter running ChimeraX with connection by wifi using Quest AirLink.  The jitter can be small fast shaking about 10% of the time when moving my head as if rendering is dropping every other frame, or possibly 2 frame drops, and about every 5 seconds of motion a bigger drop where the molecule freezes and jump about 5 centimeters.  My test molecule had only about 20 atoms, PubChem 5957, in stick display style.  This was the observed behavior at home with my wifi router downstairs and testing 40 feet away upstairs, so wifi signal strength was average.  Also the router is 802.11ac on 5 GHz using 80 MHz channel width.  Quest 2 AirLink advises using the more modern 802.11ax (""wifi 6"") and using the router in the same room.  So the observed jitter is not too surprising.  When I moved to the same room as the router the jitter was much less, maybe one big jump each 60 seconds, and only barely perceptible fine jitter.  AirLink was at its default configuration of Dynamic bandwidth targeting 100 Mbits/second.  When I switched to using the link cable to USB 3.1 on the Windows 10 computer (GTX 1080 Ti graphics), the jumps disappeared and jitter was very fine.  The jitter was still much more noticeable than what is seen in the AirLink home panels which appear completely smooth during head motion.  Possibly SteamVR introduces the jitter.  Should experiment moving around the SteamVR home room on AirLink.

The reason I did this test was because I also observed jitter and jumps in the vizvault in N453 with a wifi 6 router in the same room.  I need to retest in the vizvault to quantify how severe the problem is.
"	defect	assigned	moderate		VR								all	ChimeraX