Asynchronous Spacewarp - Revision history

Xinreality: /* ASW 2.0 */

2025-11-14T09:24:18Z

ASW 2.0

← Older revision		Revision as of 09:24, 14 November 2025
Line 71:		Line 71:
	! Feature !! ASW 1.0 !! ASW 2.0		! Feature !! ASW 1.0 !! ASW 2.0
	\|-		\|-
	\| Motion Handling \|\| Animation and basic tracking \|\| Combines with PTW for rotation and translation		\| [[Motion Handling]] \|\| Animation and basic tracking \|\| Combines with PTW for rotation and translation
	\|-		\|-
	\| Timewarp Type \|\| OTW (no depth) \|\| PTW (with depth) or OTW fallback		\| [[Timewarp Type]] \|\| OTW (no depth) \|\| PTW (with depth) or OTW fallback
	\|-		\|-
	\| Depth Buffer Usage \|\| Not required \|\| Required for full benefits		\| [[Depth Buffer Usage]] \|\| Not required \|\| Required for full benefits
	\|-		\|-
	\| Parallax Correction \|\| Handled by ASW \|\| Mostly by PTW, reducing artifacts		\| [[Parallax Correction]] \|\| Handled by ASW \|\| Mostly by PTW, reducing artifacts
	\|-		\|-
	\| Visual Artifacts \|\| More prone to judder \|\| 80% reduction in estimation artifacts		\| [[Visual Artifacts]] \|\| More prone to judder \|\| 80% reduction in estimation artifacts
	\|-		\|-
	\| Worst-case Scenarios \|\| Severe artifacts \|\| 99% reduction in pattern artifacts		\| [[Worst-case Scenarios]] \|\| Severe artifacts \|\| 99% reduction in pattern artifacts
	\|-		\|-
	\| Latency \|\| Reduces via ATW \|\| Further lowered with PTW		\| [[Latency]] \|\| Reduces via ATW \|\| Further lowered with PTW
	\|-		\|-
	\| Compatibility \|\| Any eye buffer submission \|\| Needs depth and metadata		\| [[Compatibility]] \|\| Any eye buffer submission \|\| Needs depth and metadata
	\|}<ref name="asw2-guide"/>		\|}<ref name="asw2-guide"/>

Xinreality at 23:01, 28 October 2025

2025-10-28T23:01:52Z

Show changes

Xinreality at 22:44, 28 October 2025

2025-10-28T22:44:17Z

Show changes

Xinreality at 21:21, 7 May 2025

2025-05-07T21:21:13Z

← Older revision		Revision as of 21:21, 7 May 2025
Line 19:		Line 19:
	When it comes to virtual reality, ATW and ASW are siblings and complement each other. Timewarp is great for accommodating head rotation. In fact, it's perfect for static images at a distance. For applications like 360 videos and features on the horizon, Spacewarp is unnecessary. Conversely, Spacewarp is pretty good for animated objects up close but not so great at tracking head rotation.		When it comes to virtual reality, ATW and ASW are siblings and complement each other. Timewarp is great for accommodating head rotation. In fact, it's perfect for static images at a distance. For applications like 360 videos and features on the horizon, Spacewarp is unnecessary. Conversely, Spacewarp is pretty good for animated objects up close but not so great at tracking head rotation.

	With ASW, Oculus is building on ATW to produce the best virtual reality experience possible. Effective latency is kept low and head tracking as before is ~~smooth—and~~ now, moving elements within VR are also kept smooth.<ref name="oculus blogpost">https://developer.oculus.com/blog/asynchronous-spacewarp/</ref>		With ASW, Oculus is building on ATW to produce the best virtual reality experience possible. Effective latency is kept low and head tracking as before is smooth, and now, moving elements within VR are also kept smooth.<ref name="oculus blogpost">https://developer.oculus.com/blog/asynchronous-spacewarp/</ref>

	==Requirements==		==Requirements==

Neo222: /* Introduction */

2016-11-28T05:22:05Z

Introduction

← Older revision		Revision as of 05:22, 28 November 2016
Line 4:		Line 4:
	[[Asynchronous Spacewarp]] or '''ASW''' applies animation detection, camera [[translation]], and head translation to previous frames in order to predict the next frame. As a result, motion is smoothed and applications can run on lower performance hardware. ASW expends upon [[Asynchronous Timewarp]] (ATW), which only applies to the [[rotational tracking]] of the head.		[[Asynchronous Spacewarp]] or '''ASW''' applies animation detection, camera [[translation]], and head translation to previous frames in order to predict the next frame. As a result, motion is smoothed and applications can run on lower performance hardware. ASW expends upon [[Asynchronous Timewarp]] (ATW), which only applies to the [[rotational tracking]] of the head.

	The Rift operates at 90Hz. When an application fails to submit frames at 90Hz, the Rift runtime drops the application down to 45Hz with ASW providing each intermediate frame.		The Rift operates at 90Hz. When an application fails to submit frames at 90Hz, the Rift runtime drops the application down to 45Hz with ASW providing each intermediate frame. Asynchronous SpaceWarp (ASW) enables users to run the Oculus Rift on lower specification hardware than our current recommended specification.

	ASW tends to predict linear motion better than non-linear motion. If your application is dropping frames, you can either adjust the resolution or simply allow ASW to take over.		ASW tends to predict linear motion better than non-linear motion. If your application is dropping frames, you can either adjust the resolution or simply allow ASW to take over.

	~~Asynchronous SpaceWarp (ASW) enables users to run the Oculus Rift on lower specification hardware than our current recommended specification.~~

	ASW is available with the release of the Oculus 1.10 runtime. It will be enabled across all ranges of hardware and systems that support the feature, and activated for all applications. ASW will automatically engage whenever the application needs extra time for rendering. For developers the [[Oculus Debug Tool]] will provide support for controlling ASW for development purposes.		ASW is available with the release of the Oculus 1.10 runtime. It will be enabled across all ranges of hardware and systems that support the feature, and activated for all applications. ASW will automatically engage whenever the application needs extra time for rendering. For developers the [[Oculus Debug Tool]] will provide support for controlling ASW for development purposes.

Neo222 at 05:20, 28 November 2016

2016-11-28T05:20:08Z

← Older revision		Revision as of 05:20, 28 November 2016
Line 79:		Line 79:
	#Never assume the display frame time is 1/90th of a second (or any other constant value). Run application simulations including animations and physics based on elapsed real time, not frame counts. There are a number of frame rates found on current VR headsets. The range today is anywhere from 45 fps to 120 fps. Fixing computations to any expected value will guarantee your application runs at the wrong rate on any other hardware. Timing the application to the frame rate will almost certainly result in bugs and poor experiences.		#Never assume the display frame time is 1/90th of a second (or any other constant value). Run application simulations including animations and physics based on elapsed real time, not frame counts. There are a number of frame rates found on current VR headsets. The range today is anywhere from 45 fps to 120 fps. Fixing computations to any expected value will guarantee your application runs at the wrong rate on any other hardware. Timing the application to the frame rate will almost certainly result in bugs and poor experiences.
	#Provide quality settings that are easy for users to understand. Simple Low/Medium/High quality settings allow users to tweak a preferred quality sweet spot. Esoteric or hard to understand settings will result in users poorly tuning their application settings and having a negative experience with your software.<ref name="oculus blogpost">https://developer.oculus.com/blog/asynchronous-spacewarp/</ref>		#Provide quality settings that are easy for users to understand. Simple Low/Medium/High quality settings allow users to tweak a preferred quality sweet spot. Esoteric or hard to understand settings will result in users poorly tuning their application settings and having a negative experience with your software.<ref name="oculus blogpost">https://developer.oculus.com/blog/asynchronous-spacewarp/</ref>

			==As a Consumer, How to Take Advantage of ASW==
			???????????????

	==References==		==References==

Neo222 at 05:16, 28 November 2016

2016-11-28T05:16:15Z

@@ Line 5: / Line 5: @@
 The Rift operates at 90Hz. When an application fails to submit frames at 90Hz, the Rift runtime drops the application down to 45Hz with ASW providing each intermediate frame.
 ASW tends to predict linear motion better than non-linear motion. If your application is dropping frames, you can either adjust the resolution or simply allow ASW to take over.
 Asynchronous SpaceWarp (ASW) enables users to run the Oculus Rift on lower specification hardware than our current recommended specification.
 ==How Does Asynchronous Spacewarp Work?==
@@ Line 60: / Line 60: @@
 *Control-Numpad3: Forces apps to 45Hz with ASW enabled. Enabling and disabling ASW will help you see the effects of ASW.
 *Control-Numpad4: Enables ASW. ASW automatically turns on and off, depending on whether the app maintains a 90Hz frame rate. This is the default runtime rendering mode.<ref name="oculus documentation">https://developer3.oculus.com/documentation/pcsdk/latest/concepts/asynchronous-spacewarp/</ref>
 ==References==

Neo222: /* How Does Asynchronous Spacewarp Work? */

2016-11-28T04:59:18Z

How Does Asynchronous Spacewarp Work?

← Older revision		Revision as of 04:59, 28 November 2016
Line 17:		Line 17:
	An example of this extrapolation is shown below. We have a scene in which a held gun which is moving from right to left in frames 0 and 1 (generated 1/45th of a second apart), and we want to generate an extrapolated frame from that movement (1/90th of a second after frame 1). We detect the movement of the gun and generate a new frame which we display on behalf the application.		An example of this extrapolation is shown below. We have a scene in which a held gun which is moving from right to left in frames 0 and 1 (generated 1/45th of a second apart), and we want to generate an extrapolated frame from that movement (1/90th of a second after frame 1). We detect the movement of the gun and generate a new frame which we display on behalf the application.

	[[File:asw_example_gif1.gif]]		[[File:asw_example_gif1.gif\|300px]]

	When it comes to virtual reality, ATW and ASW are siblings and complement each other. Timewarp is great for accommodating head rotation. In fact, it's perfect for static images at a distance. For applications like 360 videos and features on the horizon, Spacewarp is unnecessary. Conversely, Spacewarp is pretty good for animated objects up close but not so great at tracking head rotation.		When it comes to virtual reality, ATW and ASW are siblings and complement each other. Timewarp is great for accommodating head rotation. In fact, it's perfect for static images at a distance. For applications like 360 videos and features on the horizon, Spacewarp is unnecessary. Conversely, Spacewarp is pretty good for animated objects up close but not so great at tracking head rotation.

Neo222 at 04:58, 28 November 2016

2016-11-28T04:58:57Z

← Older revision		Revision as of 04:58, 28 November 2016
Line 1:		Line 1:
	{{see also\|Timewarp}}		{{see also\|Timewarp}}
	{{stub}}		{{stub}}
	[[Asynchronous Spacewarp]] or '''ASW''' applies animation detection, camera [[translation]], and head translation to previous frames in order to predict the next frame. As a result, motion is smoothed and applications can run on lower performance hardware.		==Introduction==
			[[Asynchronous Spacewarp]] or '''ASW''' applies animation detection, camera [[translation]], and head translation to previous frames in order to predict the next frame. As a result, motion is smoothed and applications can run on lower performance hardware. ASW expends upon [[Asynchronous Timewarp]] (ATW), which only applies to the [[rotational tracking]] of the head.

	The Rift operates at 90Hz. When an application fails to submit frames at 90Hz, the Rift runtime drops the application down to 45Hz with ASW providing each intermediate frame.		The Rift operates at 90Hz. When an application fails to submit frames at 90Hz, the Rift runtime drops the application down to 45Hz with ASW providing each intermediate frame.
Line 10:		Line 11:

	Asynchronous SpaceWarp (ASW) enables users to run the Oculus Rift on lower specification hardware than our current recommended specification.		Asynchronous SpaceWarp (ASW) enables users to run the Oculus Rift on lower specification hardware than our current recommended specification.

			==How Does Asynchronous Spacewarp Work?==
			ASW generates extrapolated frames from previous frames generated by the VR application. On the surface, this sounds quite a bit like ATW, which is capable of extrapolating for only a single thing: the user's head rotation. While this covers many of the hitches, it's not a magic bullet. ASW works in tandem with ATW to cover all visual motion within the virtual reality experience. This includes character movement, camera movement, Touch controller movement, and the player's own positional movement. If the application falls behind the display's frame rate, the experience typically remains smooth and enjoyable.

			An example of this extrapolation is shown below. We have a scene in which a held gun which is moving from right to left in frames 0 and 1 (generated 1/45th of a second apart), and we want to generate an extrapolated frame from that movement (1/90th of a second after frame 1). We detect the movement of the gun and generate a new frame which we display on behalf the application.

			[[File:asw_example_gif1.gif]]

			When it comes to virtual reality, ATW and ASW are siblings and complement each other. Timewarp is great for accommodating head rotation. In fact, it's perfect for static images at a distance. For applications like 360 videos and features on the horizon, Spacewarp is unnecessary. Conversely, Spacewarp is pretty good for animated objects up close but not so great at tracking head rotation.

			With ASW, Oculus is building on ATW to produce the best virtual reality experience possible. Effective latency is kept low and head tracking as before is smooth—and now, moving elements within VR are also kept smooth.<ref name="oculus blogpost">https://developer.oculus.com/blog/asynchronous-spacewarp/</ref>

	==Requirements==		==Requirements==

Neo222 at 04:40, 28 November 2016

2016-11-28T04:40:56Z

← Older revision		Revision as of 04:40, 28 November 2016
Line 1:		Line 1:
			{{see also\|Timewarp}}
	{{stub}}		{{stub}}
	~~{{see also\|Timewarp}}~~
	[[Asynchronous Spacewarp]] or '''ASW''' applies animation detection, camera [[translation]], and head translation to previous frames in order to predict the next frame. As a result, motion is smoothed and applications can run on lower performance hardware.		[[Asynchronous Spacewarp]] or '''ASW''' applies animation detection, camera [[translation]], and head translation to previous frames in order to predict the next frame. As a result, motion is smoothed and applications can run on lower performance hardware.