Rift latency

"doktorvr" wrote:
Has anyone else measured the Rift's end-to-end latency? By this I mean movement time to photons off the screen time. I am getting numbers around 25-35ms measured using the official Unity plugin. Can anyone also provide their numbers? Perhaps Palmer and co have 'official' numbers?

How are you measuring WHEN the Rift starts moving, until WHEN the photons are coming off the screen?

Software running on the PC can only measure when it receives a HID packet containing tracker data, until the time it sends a frame to the video card. Depending on video settings, there may be latency before it is sent to the Rift display, and the Rift may take a bit to activate the pixels, and they have pixel switching time on top of that.

You would really need a photosensor at least, to detect changes from the "photons off the screen" as you said.

EDIT: OculusVR has a latency tester device that replaces a lens eyecup for testing. It contains such photosensors as I mentioned, and a display to show measured latency. I have one on order...