HTC Vive Timewarp Pull In Effect in The Gallery
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How is it possible to get the effect of a 90 FPS rotation while the game is running at 45 FPS? Warp. Timewarp is the ability for the SteamVR system to move the frame on the HMD slightly without input from the game if a new frame has not reached the display at the specified 90Hz / 11.1ms time.
And we can show it in action. Again, using a fast frame rate capture, this time a 240 FPS GoPro, we were able to see timewarp working as we spin the HTC Vive to the right on the GTX 970 test system in a 45 FPS environment (that trusty campfire). (Note this video looks more flickery because of the GoPro frame rate.)
If you watch closely you can see black “pull in” effect of timewarp – because there are no new pixels from the game engine to show in that location as the frame is moved with the direction of head movement. As the game catches up that pull in effect is corrected. As we are in static 45 FPS location for testing, that pattern repeats.