>Psychtoolbox>PsychHardware>PsychVRToolbox

res = CV1Test([waitframes=90][, useRTbox=0]) - A timing test script for HMDs by use of a photometer.

Needs the RTBox, and a photo-diode or such, e.g., a ColorCal-II,
connected to the TTL trigger input of a RTBox or CRS Bits#.

While measured timestamps/timing on OculusVR-1 via PsychOculusVR1 is catastrophic,
and bad on all proprietary OpenXR runtimes on Windows (OculusVR](SteamVR)) and Linux
(SteamVR), as well as with standard Monado, we get close to perfect timestamps with
our “metrics enhanced” Monado on Linux + Mesa Vulkan drivers with timestamping support,
as tested with both Oculus Rift CV-1 and HTC Vive Pro Eye on AMD Raven Ridge apu with
radv + timing extension and Monado metrics mode. Errors are sub-millisecond wrt. to
testing with a ColorCal2 and also with a Videoswitcher in simulated HMD mode.