| Author | Message | ||
     cheesehole Rating: N/A |
hi I've learned a lot here... glad I found this forum. I thought I'd share my experience, and hopefully get your expert assistance with a problem I have. I'm using the H3d glasses with a InFocus LP350 projector and the NVidia stereo 3d drivers for Win2k on a Geforce3. at first I thought this would not work, because my initial results were poor, but I soon realized this was because the image was inverted. apparently there is just enough of a delay in the image processor on the projector, so that the left/right images are almost EXACTLY inverted. (the delay causes the left image to display while the right shutter is open) my solution was to break the arms off my wireless 3d glasses and wear them backwards with a rubber band holding them to my face. I'm sitting about 15ft from the screen, which is 8.5ft diagonal. the projector can handle 85Hz, but I've been running at 60Hz with success (the projector manual recommends running at 60Hz) the results have been very satisfying! the worst problem is very high image flicker compared to a monitor, which is not problematic except with bright white scenes. I may be able to reduce that by increasing the refresh rate. also, the projector doesn't like to sync up while the 3d stereo is engaged so you have to use the hot-key to turn off stereo3d until the projector syncs up, then re-engage it. this only has to be done when starting the game. after that, there are no problems. Here is my question/problem: the IR transmitter can be positioned in front of me, even though the glasses are backwards with the IR receiver against my face. but the range is slightly more limited this way. and the glasses aren't as comfortable to wear backwards. furthermore, once I break off the arms for backwards viewing, it is difficult to use them for NORMAL viewing. I noticed there are products with a REVERSE switch on them. THIS IS WHAT I NEED!!! can you tell me if there is a way to reverse my own glasses without the switch? then I could wear them comfortably with the IR receiver facing outwards, and with no physical modification (at least no destructive mod) to the glasses. this could be accomplished at the driver level I'm sure, or at the glasses themselves (sounds much simpler). any insight into a solution would be greatly appreciated! btw - I've been playing Q3 on this thing and it really has improved my game. it took some getting used to, but aside from the flicker, the 3d effect is almost flawless. ghosting is there, but it actualy doesn't show up most of the time, and when it does, I don't notice it while I'm playing. in extreme cases (bfg on the spaceCTF level for example) the ghosting is obvious. coolest demo game I've discovered so far is Boarder Zone. the 3d is almost perfect in the downloadable demo, and better in the full version. not the best snowboarding game out there, but standing up in front of a 8 foot 3d image with the Air joystick as a controller is quite an intense experience. it's great cuz you can hand it to anyone who comes over and they can immediately play the game and be totally blown away by the sense of speed and depth... this setup makes a so-so game seem really amazing. thanks for any help reversing my shutter glasses. thanks for responding Christoph. I have the Metabyte version of the H3D kit, and I'm using the NVidia stereo drivers. - ben | ||
| Alexander Oest Rating: N/A |
A somewhat destructive mod (but reversible if necessary) would be switching the wires going to the two shutter panels. Some soldering might be needed. But instead, try checking if your projector has a way of bypassing it's frame rate converter. I did it on a Davis DLP projector, and it worked fine and was fully synchronous - though only in 60 Hz. You can read about it in this thread: http://www.stereo3d.com/discus/messages/24/83.html?1013436261 Alex | ||
| Anonymous Rating: N/A |
dude, there is a hotkey for inversting l/r in the nvidia stereo driver, ctrl+w if i remember corretly, but check it out in the driver hotkey panel. | ||
| Anonymous Rating: N/A |
does this mean that most infocus DLP's can be used for stereo? at least those with the same DLP chip specs? What happens when you go up to 85Hz? | ||
| cheesehole Rating: N/A |
thanks Alex and anon's for the responses... I'll check out that hot key for reversing the stereo in the NVidia driver. (that will be a perfect solution! and looks like CTRL+W is correct according to the web sites) I'll also check out the results at 85Hz. I don't know if other Infocus DLP projectors will work. it was just luck that the LP350 works, I certainly didn't have 3d in mind when I chose it. Alex, can you explain what the purpose of the frame rate converter is? (beyond the obvious of course  - ben | ||
| Alexander Oest Rating: N/A |
Cheesehole, I think the deeper logic behind the frame rate converter has to do with the colour wheel. AFAIK it runs at a fixed rate - say 60 revs per second. This means that (assuming the wheel has four fields - red, green, blue and white), the effective refresh rate of the projector is 60 Hz. It then has to convert all vga signals to that refresh rate - except for those that happen to be at 60 Hz. There are projectors that have six fields (rgbrgb) in the colour wheel, effectively doubling the "native" refresh rate. There might also be projectors whose colour wheels run faster. I'm trying to find out which projectors have those features and whether it'd actually work. A DLP projector doing 120 Hz native would be ideal. Alex | ||
| Anonymous Rating: N/A |
Barco is developing a stereo capable DLP projector running at 120Hz, either it is out or it will come out soon. As usual, Barco stands for quality at mind-bending high prices. www.barco.com | ||
| Anonymous Rating: N/A |
Here it is, the Barco Galaxy, if you have a fat wallet: http://www.barco.com/projection_systems/products/product.asp?element=928 http://www.barco.com/projection_systems/downloads/Barco%20Galaxy.pdf 110Hz is not the original 120Hz they aimed for, but is good enough. Guessing that prices range from 20000-100000 US$ depending on the optional extras, guestimating 50k for active stereo with no other addons. Check with your local Barco retailers. | ||
| cheeshole Rating: N/A |
http://www.stereo3d.com/news/news0062.html this page says there is no stereo reverse hot-key for the NVidia driver, and CTRL+W doesn't work in case anyone is interested. I did the stereo test in the display properties at 85Hz and the flicker is minimal, but there is a side effect. the colors are slightly off in one eye compared to the other. this results in some objects apearing to shimmer, but I think it is preferable to the flicker. maybe that has something to do with the color wheel not spinning fast enough... not sure exactly how that works but it would kind of make sense. still looking for a driver based solution to the stereo-reversal. if anyone knows a Registry hack to acheive this I'd be grateful if you shared it - ben | ||
| Anonymous Rating: N/A |
If you have a 50/50 issue when only the glasses are OK half of all time, use the "enable stereo by hotkey" and set it on/off until its OK. | ||
| FrancoT Rating: N/A |
Hi all, anyone has tried active stereo using the projector NEC 150Z? It's a DLP projector with the new DMD (Digital Micromirror Device) tecnology. It basically means that it should be able to reach true 120Hz of refresh. Stereographics is claiming that this tecnology works on the Christie Digital Systems Mirage projector series, so it might work also on the much cheaper NEC. What do you think? Franco | ||
| Donat-Pierre LUIGI Rating: N/A |
Here at ICT (Institute for Creative Technologies, Graphics Lab.), the research project I am involved with consist of projecting structured light patterns onto a subject in order to recover its geometry from the video captured projected images. - My goal is to make it robust and faster, hence a 60fps synchronized projection/capture is what I am after!!! I am currently looking to replce a Proxima X350 DLP Projector with one which would have both a long throw ration of ca. 4:1 to 5:1 and, ideally, could be synchronized with or give a signal to sync. a video camera. I am expecting a call from Buhl optical about optional lenses for an Optoma EzPro755/753/750 series. I am writing to this post about the latter point, regarding work around to sync. with a camera. I have noticed that DVI connectors seem to pass both computer graphics controller and Digital Display channel clock signal (pins #22,23,24 and #6 respectively). Does it mean that these could be used to generate a synchronizing signal to either the video camera recording the DLP display images or the DLP iteslf, which seems challenging? Conversely, I was wondering if this also meant that a latency delay could be measured from this clock signals and the effective timing of the vertical refresh (i.e. displayed image)? I might be naive but if this latency delay is consistent and can be measured then the effort could focused on timing the video capture, which might be easier to achieve with a varying gen locking signal. I would greatly appreciate if anyone could clarify this point and help me understand the signal processing involved in the technology of DLP using DVI connections. |
