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Screen With 180 Degree Field of View
emj writes to tell us project jDome has started actively soliciting consumer feedback and, of course, donations. They are currently promising to deliver their "180 degree FOV monitor" this year for a pricepoint of around $200. The videos and talk have been circulating for the last couple of weeks or so, but they have added a video of the supposed tech in action. Buyer beware, but I would love to see a couple of reviewers get ahold of this and let us know what the story is.
That looks like it would give me motion sickness for some reason. Maybe it's due to everything being stretched out of proportion and whenever you turn it's constantly shrinking and expanding. I don't know but that looked like a piece of crap to me.
You're nothing; like me.
Note that the image is very badly distorted towards the edges. To correct this, the image must be generated as a "fisheye" type image, with the proper FOV, which will entail altering the way the image is rendered--i.e. code access required. Note also significant luminance fall-off towards the edges--the light is striking the dome at such an oblique angle that it's failing to light it properly. Immersive gaming is pretty damn cool, and perhaps this unit will work well enough to catch on with some gamers. But what you REALLY need is one of these: http://www.gadgetmadness.com/archives/20040724-elumens_visionstation.php
I think it might be even worse than that - note the curvature extends about a foot maybe two beyond where you're standing - I can't imagine you'd get any kind of consistent focus from a regular home-cinema/business projector, so although the curvature of the dome would offset some of the distortion at an appropriately chosen FOV setting (probably not quite 180), you'd have to put up with probably considerable blur at the edges.
FPS games give me motion sickness already, but that's because the distorted areas of the game are projected onto a plane, and when I track something to the side or bottom of the screen I look directly at them. Having them off in my peripheral vision would seem to reduce that. Having the game create a sphere map instead of one plane of a cube map (which is what it's effectively doing when you expand the fov inside the game) would be even better, because it would eliminate the corner distortion.
It depends on the game. I've been using a Projector as my main gaming screen for the last 7 years or so. My current setup is an Optoma HD-73 throwing on to a 94"x94" Dalite Glass Bead Pull-Down. I use an Xbox 360 for most of my gaming.
some games become much easier to play, Fighting games, Racing Game, and Turn Based Role players. Other Games take some getting used to like FPSs and the Tony Hawk Series are nauseating at first due to the fast movement of the entire picture at once. Once you get used to it though, it's no different than playing on a normal screen.
Some games do suffer though. For instance I do much worse when playing FPSs or DDR games on the projector because I have to move my eyes around the screen to see everything. On a normal screen 100% of the on screen activity is in my field of view 100% of the time. Also playing the Wii on the projector is difficult, for one you often find yourself casting shadows on the screen, and there are other issues associated with the IR pointer that make using that aspect of the controller difficult at best.
Even still all Games are much more engaging and immersing on such a large screen IMO... I wouldn't trade my gaming setup for any alternative... Playing on a normal screen after the projector just seems cheesy by comparison.
Collector's Edition
http://hardware.slashdot.org/article.pl?sid=08/01/08/1257258&from=rss
//holding out for the 5760x1200 version
3 feet wide, 2880x900 resolution, and no projector necessary.
Of course, it might be a bit pricy, but them's the breaks for something nice.
Most 3D games won't let you set the FOV to 180 degrees, since it's impossible using flat (pinhole?) projection that most of them use. This choice of projection is also why things look so distorted at the edges of the screen with a high FOV, and is why objects that are near you appear larger than objects in front of you, even when they're the same distance away, among other visual quirks. In order to show such a wide angle (approaching 180 degrees or above), you'd need to use a projection that's not limited to showing objects on one side of a plane, such as fisheye projection. This isn't normally done because it's technically simpler to do 3D rendering when straight lines in the world correspond to straight lines on the screen (that's the simplified explaination).
See this page for a visual comparison.
Duct tape, XML, democracy: Not doing the job? Use more.
Welcome to jDome, the world's first charity for supporting gamers developing substandard implementations of a cool idea. I know I wouldn't throw free money at a guy just so he can continue developing what is essentially a curved white surface. He doesn't even acknowledge that the distortion caused by projecting a flat image onto a curved surface is a problem, as one of his forum users brought up: http://www.jdome.com/phpBB3/viewtopic.php?f=8&t=8
Of course, if this guy does pull it off by sheer balls, and perhaps sometime down the line starts actually selling a decent product, more power to him. I just hope a bunch of hopeful gadget addicts don't end up tossing their money down a drain.
Combine a superior implementation of this idea with Johnny Lee's Wii head tracker and you'll have an amazingly immersive experience.
I have a Mitsubishi HC4000U and a 120" screen. After trying a couple of rather expensive but unexpectedly lousy screens from a local home theater store, I made one myself using screen material I got on eBay. For about four hundred bucks in tools and materials it turned out better than a three-thousand-dollar screen from HTX.
:) The way to solve this problem is to lay off the booze and move a little farther away from the screen. From the very start you need to carefully choose the size of the screen that's appropriate for your projector and the size of your theater room.
The setup works great with xbox 360 and PS3. Some people get dizzy playing Battlefield II or GTA 4, especially after a cigar or a couple of martinis
I remember playing with something pretty identical to this at E3, several years ago, a while before Flight Simulator X came out.
As I recall, it was more like 120-140 degrees rather than pretending it was full 180. Then again, I'm not convinced the jDome is true 180 either - think about it, one point, relatively close, projecting on to a hemisphere, by definition, can't get to the outtermost edges.
The experience was certainly cool and definitely added an immersive element.
It wasn't quite as cool as it promised to be though for the following reasons:
Projector resolution generally sucks - even now, 1080p projectors cost several thousand dollars vs. about $400 for a basic 24 inch 1920x1200 LCD monitor. Most likely, you're going to be hobbled with 720p which is on the low end of most gaming systems these days. Now factor in that 1280 horizontal resolution has to project both the normal ~60 degree view AND the sides. You're now at maybe the equivalent of 800x600 for the area your cheaper 1920x1200 monitor is showing. Sure, you get the edges - but at a massive cost to the center's clarity.
Whilst edges are nice, down is often pretty pointless. It looks great if you're flying with the instrument panel turned off. The moment you turn it on, that whole bottom half of the screen is now filled with your control panel and your legs. You've gone to all of this trouble and you see... a big grey panel and a nice rendering of legs moving pedals. Most FPSs are relatively planar and so, most of the time, all you see is the ground running underneath you. Sure, it's nice when you're shooting around an industrial complex with people above and below... but most of the time you're just trading resolution for watching empty space above and very close ground below. You'll notice our eyes are horizontal, giving a much wider field of view than a vertical one.
You generally need your input devices resting on something. Unless you spend a fortune on custom controllers, odds are you're going to need a keyboard and mouse for most FPSs, a keyboard, throttle, yoke and mouse for menus for flight sims. The table you need to put all of that on ends up obscuring half of your downward view anyway. Plus it tends to really suck, trying to use most input devices while standing anyway.
It's a fun concept. Much like shutter glasses and TrackIR, it's one that can add a whole lot of wow factor, albeit at the expense of real practical use. On the flip side, for those with money to burn, a 1080p projector, a fast gaming rig, shutter glasses to make it 3D as well and TrackIR to make swaying your head from side to side have a difference... it could be the ultimate show off gimick. Hopefully it'll be easy to wash, when motion sickness makes people vomit, too.
Oh dear. I was thinking this was something really cool like a peice of hardware or software that remapped the image for projectong onto a curved surface. Nothing of the sort: it is just a dome screen. All he does is run Crysis with a custom field of view. There is no perspective correction, which mean that straight objects like trees and cranes are bowed on the screen. On top of that, his idea increases the viewable area, but not the pixel count. Indeed the pixel count would be less, unless you could afford a projector with the same resoultion as a decent LCD monitor.
You either need a fisheye lens to snap on to the projector, or some kind of computational remapping. One of the only games I know of that remap the image in this way is Fisheye Quake (http://strlen.com/gfxengine/fisheyequake/index.html), and it is much more computationally intensive than regular Quake. I'd imagine Fisheye Crysis would be a nightmare to get running at a decent framerate.
This product is limited to games only, and games that allow you to modify the fov at that (changing the fov doesn't make the image fisheyed). I'd quite happily pay for something similar that I could use every day for CAD/CAM work. I think if he could find/make a fisheye lens that snaps onto the front of a projector, and market it for a bit more, he'd be onto a winner.
Fisheye lenses are very expensive, so the only cheap solution would be projection off a hemispherical mirror (http://local.wasp.uwa.edu.au/~pbourke/projection/meshmapper/), but I can see a way of doing that by rear projection.
Anyway, I would be wary of buying something that the manufacturer admits is "simple wire-frame and scotch-taped numerus badly cut letter-sized papers". I can't really see how this has been patented, as there is plenty of prior art for rear projected domes out there.