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Doc-Ok.Org
Personal blog · doc-ok.orghardwareprogramming
Doc-Ok.Org is a personal blog at doc-ok.org about hardware and programming. Since 2014, 24 different Hacker News readers have linked it 38 times, most often “Optical Properties of Current VR HMDs”. No feed was found, so read it on the site itself.
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38mentions?
24HN people?
2014–2023first – last linked?
Too few sampled comments (25) to say how often HN recommends it.?
Why HN links it
HN readers link Oliver Kreylos's Doc-Ok.Org for in-depth, hands-on analysis of VR and AR hardware, including HoloLens field of view, Rift tracking, latency, optics and IPD, written by a VR researcher.
Summarised by Claude from a sample of 25 HN comments that link here. Each comment is marked recommending, critical or neutral (citing without judging); how this works.
Most-linked posts?
- /?p=12234 people · 5 mentions · first linked 2015-06-03
- Optical Properties of Current VR HMDs3 people · 3 mentions · first linked 2016-04-01
- Reverse-engineering how the Oculus Rift DK2′s tracking system works (2014)2 people · 3 mentions · first linked 2014-10-11
- /?p=12742 people · 2 mentions · first linked 2015-10-06
- 3D Video Capture with Three Kinects2 people · 2 mentions · first linked 2014-05-13
- HTC Vive – Lighthouse tracking examined2 people · 2 mentions · first linked 2016-05-25
What Hacker News says?
A lower FOV actually translates to better PPD. You can use a basic formula: sqrt(hRes^2+vRes^2)/FOV. So a 100 degree FOV would give you about 36PPD, but a 90 degree FOV would actually give you an even better 40PPD. 60PPD is Apple's target for a "Retina" display, although there's a strong argument that you need double that at least for line pairs. For computer work purposes, we really should only care about matching…
Comment linking /?p=1414
on “Show HN: Simula One – Portable Linux VR Computer”Submitted 3D Video Capture with Three Kinects as a story · 188 points
HN discussionYes it uses both, relative and absolute measurements (each with its own drawbacks) into what's usually called sensor fusion. It's very well explained here: http://doc-ok.org/?p=1478 The headset is not wireless and the controllers have 1-2 ms of latency. They compress the controller data a lot in a very smart way. More info: https://hackaday.com/2016/12/12/cnlohr-reverses-vive-valve-e...
Comment linking /?p=1478
on “Relativ – A VR headset that you can build yourself for $100”Submitted A Trip Down the Graphics Pipeline as a story · 135 points
HN discussionMost of the journalists w/ first person demos have given relatively poor descriptions, but Oliver Kreylos a UC Davis VR researcher recently published a very in-depth review of his experience w/ the Hololens hardware, including his observations on FOV, occlusion, etc: http://doc-ok.org/?p=1223
Comment linking /?p=1223
on “Oculus Rift”Submitted Reverse-engineering how the Oculus Rift DK2′s tracking system works (2014) as a story · 44 points
HN discussionThe problem with 3D films has nothing to do with focus. It has to do with an incorrect projection method[0], inevitable IPD mismatch, narrow FOV, and the distortion inherent in sitting anywhere except the the exact center of the theater As far a depth queues go, accommodation is a very weak one that your brain learns to ignore after a few seconds. If that wasn't the case, anyone wearing glasses would stumble into th…
Comment linking /?p=77
on “A Third of Valve Is Now Working on VR”Submitted Optical Properties of Current VR HMDs as a story · 8 points
HN discussionWould they want to compact the optics though? I have absolutely no knowledge of the physics involved, but it looks like the projection style that is used has a very limited field of view that won't be resolved with more processing power. I don't see how shrinking the optics could help this. Because of this, it looks like future immersive improvements will be restricted, but I would be very happy to have it explained…
Comment linking /?p=1274
on “HoloLens secret sauce: A 28nm customized 24-core DSP engine built by TSMC”Submitted HTC Vive – Lighthouse tracking examined as a story · 4 points
HN discussionYou are making a bold and incorrect claim. """vergence-accommodation conflict, which causes a lot of the motion sickness, headaches, eye strain and other issues people have with VR""" This is untrue. It actually a pretty minor amount of the issues. There are individuals that suffer from this disproportionately but the estimates I've seen were in the low single digits. The major issues are in the source to the link y…
Comment linking /?p=1602
on “Looking Glass starts shipping its 8K holographic display”Submitted Hacking the Oculus Rift DK2, part III as a story · 4 points
HN discussionHere is the DocOk/Vrui post on latency, A Trip Down the Graphics Pipeline (2014) http://doc-ok.org/?p=1057 (from which the reddit-linked graphs came). Highlights include: > Under a non-compositing window manager, regular double-buffering under OpenGL does not incur undue latency (and there is a window manager hint to tell a compositing manager to grant pass-through to a window). > At least using the Nvidia graphics…
Comment linking /?p=1313
on “Firefox 55: WebVR and more”Submitted Optical Properties of Current VR HMDs (2016) as a story · 2 points
HN discussionhttp://doc-ok.org/?p=1082
Comment linking /?p=1082
on “John Carmack: Steps to Avoid Aliasing in VR”Submitted Reverse-engineering how the Oculus Rift DK2′s tracking system works (2014) as a story · 2 points
HN discussionExcellent reality check "Lasers Are Not Magic" http://doc-ok.org/?p=1386 "Can I make a full-field-of-view AR or VR display by directly shining lasers into my eyes?" -- No.
Comment linking /?p=1386
on “The smallest large display would be projected straight onto your retina”Submitted Hacking the Oculus Rift DK2, part II as a story · 2 points
HN discussionUC Davis' CAVE VR environment was used to help find the cities in the LIDAR data: http://doc-ok.org/?p=1204 .
Comment linking /?p=1204
on “An Ancient City Emerges in a Remote Rain Forest”I'm a bit of a VR enthusiast, and I'm not a gamer, so I think I can answer some of these. >- Outside of car games, space sims, or any other game where the main character is mostly sitting down, does VR work well? Very well. The thing I hate most, as a non-gamer, is having to learn all of the confusing controls. I really like that VR games take away most of the complication and allow you to do what feels natural. Pro…
Comment linking /?p=965
on “Oculus CEO Brendan Iribe Steps Down”I don't believe the device demo experiences themselves were under NDA, however recording devices had been restricted. Oliver Kreylos did a great writeup a while back on measuring the FOV: http://doc-ok.org/?p=1274
Comment linking /?p=1274
on “Apply for the Microsoft Hololens Development Edition”It's as much holographic as the Oculus (or other head-tracked HMDs), and the missing depth cue (accommodation) doesn't seem very important in practice. See here [0] for a good discussion on what is and is not holographic, in the context of the HoloLens, from an academic VR researcher. [0] http://doc-ok.org/?p=1172
Comment linking /?p=1172
on “Apply for the Microsoft Hololens Development Edition”Thanks for linking to Doc Ok's youtube channel! https://www.youtube.com/c/okreylos/videos 5 years ago he was active in the Vive VR world http://doc-ok.org/
Comment linking /
on “Atlas: End-to-End 3D Scene Reconstruction from Posed Images”The open-source Vrui VR toolkit[1] has some level of support for the Vive and Rift[2]. [1] http://idav.ucdavis.edu/~okreylos/ResDev/Vrui/ [2] http://doc-ok.org/?p=1508
Comment linking /?p=1508
on “Ask HN: What is the status of VR on Linux?”Oliver Kreylos probably has the best description of the current demo: http://doc-ok.org/?p=1223
Comment linking /?p=1223
on “Magic Leap Announces Its Augmented Reality Developer Platform”The guy who did the video and blog post, Oliver Kreylos, has tried HoloLens himself too http://doc-ok.org/?p=1223 .
Comment linking /?p=1223
on “Nadella talks Microsoft's mobile ambitions, Windows 10 strategy, HoloLens”The reception has been in reaction to some very fake videos--they don't show the limited FOV, and they make the projections appear opaque even under bright stage lighting, which they aren't. Here is a video showing a third person view of the FOV; it is a bit unfair when objects are really close, because they are at the small end of the frustum pyramid, watch to the end in the immersive environment part to get full p…
Comment linking /?p=1223
on “Nadella talks Microsoft's mobile ambitions, Windows 10 strategy, HoloLens”when your ipd is off its roughly the same thing as being slightly cross-eyed or slightly wall-eyed. if its small enough and the game is low-res enough it can not matter, but if you feel "eye strain" or a sortof between-the-eyes headache after playing for 20 minutes thats where it comes from. its subtle so it really gets you over time, not at any one moment. here's a good howto on measuring your ipd to get it right:…
Comment linking /?p=898
on “VR optics and why inter-pupillary distance (IPD) means too many things”I believe[1] that the head tracking qualifies it as holographic. That light field stuff looks super interesting... 1. http://doc-ok.org/?p=337
Comment linking /?p=337
on “Light Field Photography”Part 1 of an ongoing 4-part write-up. In part four he has released an alpha preview of his open source Oculus and VR framework; see http://github.com/Doc-Ok/OpticalTracking . tl;dr; The Oculus positional tracker system uses 40 IR LEDs, each with a 10-bit cyclic code of bright or dim flashes. The tracker camera is synced to the headset and can identify each LED using these codes, elegantly simplifying the job of reco…
Comment linking /?page_id=6
on “Reverse-engineering how the Oculus Rift DK2′s tracking system works (2014)”
