[DIY] InfinitEye, an ULTRA wide FOV HMD for approx 500$

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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by 3dpmaster »

PalmerTech wrote:The problem is not so much the lack of proper focus as it is the disparity between the focus of each eye. Suppose that when looking directly forward, the center of each image is focused at 10 meters. Because each lens/display is tilted in opposite directions, the focus is going to change as you move your view across the field. Hypothetically, for example, you may be looking 10 degrees to the right of center, with the right eye having to focus at 5 meters and the left eye having to focus at 15 meters.

In addition, when you move your eyes, their physical position relative to the lenses is changing, changing the distortion slightly as well. Your brain can accept that pretty well when both eyes see the same geometrical changes, especially since those changes are the same no matter which way you look. I have done tests of setups like this, and a big problem is that any eye movement will result in mismatched distortion and focus between eyes that can cause significant eyestrain.

If eyetracking technology were more advanced, you could solve as least some of these problems with realtime distortion adjustment. :(
Exactely, but it can be resolve with flexible fresnels with the focus center in front. The lenses could be curved until the edges are placed 180 deg from each eye. This way, the spherical distortions on the left and right eye are the same. If not, there coud be a severe stereographic error. There are some products on the market that uses also tilted optics similar to this HMD but the optics are rather aspherical onces.NVIS nVisor SX111 http://www.nvisinc.com/product.php?id=48 and SEOS http://cgsd.com/SEOSHMD/
Damn, I forgot to mention the screens. :(
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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by foisi »

I'm not sure to understand why people tend to believe that focusing would change depending on the position of the eye... for what I know the focus is set by the distance between the lens and the screen. This distance is the same for the whole FOV because the lens is parallel to the screen. There is chromatic aberration (that can be corrected in software) and spherical abberation (because the fresnels are not aspheric lenses) but it doesn't have a significant impact because the eye is near the optical center :)

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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by foisi »

New version :
IMG_1182.jpg
IMG_1183.jpg
[youtube]http://www.youtube.com/watch?v=oICGUy2xzNw[/youtube]

note that there are black pixels at the bottom and at the top of the panoramic image I used to make something displayable with the HMD so vertical FoV is not as it should be in the video.

I didn't paint the inside in black (or tape black paper) for the moment, I just rebuilt the box in a few hours today at lunch time and this evening just to try to prove people that the design is possible.
I took about 20 pictures when I was building the new box so I will be able to make some sort of tutorial if anyone is interested in making a similar HMD (I think it deserves a name, any suggestion ?) and I will release the printables very soon.
My mom who happened to be visiting me today tried the HMD when I just finished the new build and she said something that could be translated by "It's f***ing awesome !" ^^

The new weight is 512g (~50g less than the previous version, the PMMA lenses are heavier than the expanded PVC)
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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by PatimPatam »

Congrats foisi!!

I think this is a BIG step forward for VR displays!

EDIT: It does look like it from the videos, but did you notice a big improvement in image quality in comparison to your first prototype?
Last edited by PatimPatam on Thu Feb 21, 2013 6:25 pm, edited 1 time in total.

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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by Zoide »

This is awesome, simply awesome! I would die to have Oculus hire you and give us a 180 degree FoV, 1920x1200 consumer Rift.

A good name would be the "180", or "Pano" (as in "panoramic"). Pair it up with a company name and it would sound good.

For example: "Virtua 180", "Visualize 180", "VisualWorks Pano", "VisualTech Pano"

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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by MSat »

This is great stuff! Have you been able to determine if the displays are in fact synced?

As for a name, the first thing that popped into my mind was "InfinitEye", or some derivation such as "Infinite-i"

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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by Fredz »

Looks pretty good and the weight is not that bad. :) I wonder if it can be lowered a bit more, do you think using foamcore instead of PVC would help ? Also are the controller boards mounted on the HMD or in a separate box ?

For the name I guess you could use your nickname to personalize it a bit, after all it's your own creation. Something like the Foisi 180 for example.

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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by foisi »

@PatimPatam: yes I forgot to say that, image quality is way better than before (mainly due to the fact that there are only two fresnel lenses per eye compared to 3 in the previous prototype)
Even without applying any counter-distortion effect and chromatic corrections, the result is perfectly clear across the entire 180° horizontal FOV.

@Zoide: Maybe Dycus could make a prototype when I release the build instructions to have Palmer admit that it works ^^
even without the prints, the important things of the design are :
- 2 stacked fresnel lens 165x105mm cut with a dremel to make room for the nose and resized to 126.5mm wide (optical center is 44mm away from the cut side) 120mm focal. The flat surface need to be set toward the eyes (both fresnels for each eye)
- the distance between the surface of the screen and the flat surface of the fresnel lens that is the nearest to the eye is 66mm.
- the angle between the screens is 134°.
- the two panels are set like in the second drawing to gain a few mm (because bezel are not the same at the left and right of the panel) :
optimized_lcd.png
For the name I kinda like Pano-something =) I do not intend to make a company and sell the HMD as a product. I think this design will be released as an opensource HMD so DIYers can make their own for free (except the cost of components) and improve the design etc..
If the Oculus SDK is flexible enough, the only things to change in Oculus ready games will be the angle of the virtual camera (23° divergence for each from the central axis), FOV of each camera (set to ~121°) and distortion correction shader.

@MSat: I still don't know if the displays are correctly synchronized, it only depends on the Zotac device.. If a company like Oculus were to produce a dual screen HMD like this one, I hope they design a dual LVDS, single input controller board to solve this problem.
InfinitEye sounds good, but doesn't it sound like AMD eyefinity ?

@Fredz: to answer your previous question, I don't know where is the eye exact iris position.. sorry
The weight of 512g take into account the headmount and you're right it's not bad at all :)
The controller boards are separate (but not in a box yet, I still have to extend LVDS cables and make the box). About foamcore (ca veut dire carton-plume c'est bien ça?) can you tell me the density g/cm^3 so I can compare to expanded PVC ? Don't you think foamcore is a little weak to resist from tearing at the mounting points ?
Oh and Foisi is a terrible nickname (I will not explain why I chose it), it sounds a lot like "moisi" :lol: (french for moldy) and I don't think people want to wear something moldy on their face (even if it has 180° HFOV)
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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by geekmaster »

foisi wrote: InfinitEye sounds good, but doesn't it sound like AMD eyefinity ?
Not as much as Sony's new EyePad sounds a lot like Apple's iPad.

But then "EyePhone/iPhone" was used in the film "Johnny Mnemonic", so who knows where Apple got their inspiration for that product name:
http://www.mtbs3d.com/phpBB/viewtopic.p ... 10#p101310
http://www.mtbs3d.com/phpBB/viewtopic.p ... 10#p101452

The people who do the most copying are the most protective of the stuff they copied. Take for example the Mac GUI copied from the Xerox Star, then they sued others for copying the same stuff:
http://en.wikipedia.org/wiki/Xerox_Star

I like "InfinitEye" (especially for a non-profit Open Hardware project). I think if Sony could be so close with commercial "EyePad", you should be safe (not legal advice, see a professional for that).

I LOVE your design and the results you claim for them. After my experiments with stacked fresnel lenses, I know that the immersion provided far outweighs any sacrifice in focus or image quality caused by fresnels. I am looking forward to trying one of these (probably requiring that I build one). I still plan to build my 7-inch "Fov2Go" clone inspired by the "HMD kit" included with my "Virtual Reality Creations" book. It would be very similar to yours, but would use a single display (my Nexus 7).

Virtual Reality Creations "HMD" (circa 1993):
http://www.mitchwaite.com/writing7.htm
Image

Notice how the fresnel lenses wrap around the face, just like the HMD featured in this thread. It worked surprisingly when when attached over a stereoscopic image pair on a CRT. Extending this concept with newer better fresnel lenses it certainly bound to succeed. Your nose cutout allows for taller lenses, giving a much larger vertical FoV than the VR Creations model.

Thanks for keeping us posted on your progress!

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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by PatimPatam »

foisi wrote:@PatimPatam: yes I forgot to say that, image quality is way better than before (mainly due to the fact that there are only two fresnel lenses per eye compared to 3 in the previous prototype)
Even without applying any counter-distortion effect and chromatic corrections, the result is perfectly clear across the entire 180° horizontal FOV.
Epic stuff! This is a 100 times more exciting than all the boring PS4 news from Sony!

Btw should this thread not be moved to the "VR/AR Research & Development" section?

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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by TheLostBrain »

foisi wrote:New version :
IMG_1182.jpg
IMG_1183.jpg
[youtube]http://www.youtube.com/watch?v=oICGUy2xzNw[/youtube]

note that there are black pixels at the bottom and at the top of the panoramic image I used to make something displayable with the HMD so vertical FoV is not as it should be in the video.

I didn't paint the inside in black (or tape black paper) for the moment, I just rebuilt the box in a few hours today at lunch time and this evening just to try to prove people that the design is possible.
I took about 20 pictures when I was building the new box so I will be able to make some sort of tutorial if anyone is interested in making a similar HMD (I think it deserves a name, any suggestion ?) and I will release the printables very soon.
My mom who happened to be visiting me today tried the HMD when I just finished the new build and she said something that could be translated by "It's f***ing awesome !" ^^

The new weight is 512g (~50g less than the previous version, the PMMA lenses are heavier than the expanded PVC)



Wow! Really impressive stuff! :)

I seriously NEVER would have thought Fresnels would have provided an acceptable level of quality...but from the video I feel I may stand corrected. :)

Can you share (maybe I missed it?) exactly which fresnels you're using now (where to get em, etc.)? I may actually come out of diy-retirement to build one of these to compliment the Rift when it arrives. ;)

Thanks and awesome work!
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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by PalmerTech »

foisi wrote:@Zoide: Maybe Dycus could make a prototype when I release the build instructions to have Palmer admit that it works ^^
I am going to build it myself, and I really do hope it works. :D

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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by budda »

Hi,

Just Google " aspheric fresnel lens ", and there is plenty of great design and supplier information.

Too easy.

Thanks.

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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by MSat »

I admit that I don't know much about optics, but shouldn't it be possible to use appropriately designed fresnel lenses in a Leep-like manner, or perhaps in a fresnel/standard lens hybrid setup? It would be amazing to make a compact and light weight high-FOV HMD!

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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by geekmaster »

PalmerTech wrote:
foisi wrote:@Zoide: Maybe Dycus could make a prototype when I release the build instructions to have Palmer admit that it works ^^
I am going to build it myself, and I really do hope it works. :D
I just played with my Nexus 7 and my 5x acrylic aspheric lenses, and also with my fresnel magnifiers. When you hold the lenses parallel to the display surface, it is all in focus. For angled displays as shown here, you just need to angle the lenses, which makes them cover even more of your FoV. Even though I only tested HALF of this display concept, it worked well. If I had another 7-inch tablet it would be a better proof of concept, but I am convinced that it will work with fine focus.

For comparison, I also played with my fresnel stacks again, with a single 7-inch display (my Nexus 7). It really needs to use one-third of the width (about two inches) of each side of the lens as I described. Because the two lens stacks are identical for both eyes (other than trimming to fit nose and eyebrow ridge), there should be no problem with assymetrical focus or stereo convergence as suggested elsewhere. So I believe that my experimental method can also produce a similar wider FoV as the one in this thread (but only estimated 150-degrees or so horizontally). My approach will not give the quality of the one in this thread, but it still give huge FoV and will costs half as much (or almost nothing if you already have a Nexus 7 or equivalent). Of course, there will be latency issues though, so it remains mostly for experimental use. And the lens stacks need the ridges toward the eye, unlike the version in this thread.

Based on past research (in the days when DIY HMDs were very low resolution) it was common to put a diffuser sheet (such as waxed paper) over the screen to minimize screendoor effect, so finding a compromise focus should be fine even IF not all pixels were in focus. Small blurring objects are easier for the brain to recognize than sharp blocky objects, which I verified while adjusting the focus and using the "wide-eye" quake image pair from the Rift Quake thread.

CONCLUSION: I am confident that the HMD in this thread will work well for superior image quality, and my method will work too for a quick 7-inch tablet FoV2Go clone using fresnel magnifiers.

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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by geekmaster »

MSat wrote:I admit that I don't know much about optics, but shouldn't it be possible to use appropriately designed fresnel lenses in a Leep-like manner, or perhaps in a fresnel/standard lens hybrid setup? It would be amazing to make a compact and light weight high-FOV HMD!
It should be possible to simulate the effect of wearing eyeglasses in Real Life, where the solid acrylic aspheric lenses provide central view, and the fresnel outer area provides peripheral view. If you see the border between the lenses, it should look no worse than eyeglass frames in RL. And even a shift in focus or distortion should at that border should be simlar to wearing Real Life eyeglasses.

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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by Fredz »

foisi wrote:About foamcore (ca veut dire carton-plume c'est bien ça?) can you tell me the density g/cm^3 so I can compare to expanded PVC ? Don't you think foamcore is a little weak to resist from tearing at the mounting points ?
Yes, foamcore is carton-plume, I don't know the density but it's very lightweight. I was also worrying about the mounting points with it, but I think it can be hardened with some other materials. After all there shouldn't be too much efforts at the attachment points once it's in place.
foisi wrote:Oh and Foisi is a terrible nickname (I will not explain why I chose it), it sounds a lot like "moisi" :lol:
I didn't think about that, may not be the best term then... :P
geekmaster wrote:But then "EyePhone/iPhone" was used in the film "Johnny Mnemonic", so who knows where Apple got their inspiration for that product name
EyePhone was foremost the name of the HMD released by VPL research (of Jaron Lanier fame) in 1989, so it may really not be a good idea to use this name.

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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by MSat »

geekmaster wrote:
MSat wrote:I admit that I don't know much about optics, but shouldn't it be possible to use appropriately designed fresnel lenses in a Leep-like manner, or perhaps in a fresnel/standard lens hybrid setup? It would be amazing to make a compact and light weight high-FOV HMD!
It should be possible to simulate the effect of wearing eyeglasses in Real Life, where the solid acrylic aspheric lenses provide central view, and the fresnel outer area provides peripheral view. If you see the border between the lenses, it should look no worse than eyeglass frames in RL. And even a shift in focus or distortion should at that border should be simlar to wearing Real Life eyeglasses.

What I had in mind was something more along the lines of http://www.vrtifacts.com/hmds/leep-on-the-cheap/ where a series of lenses are used to create a large FOV from relatively small displays, but possibly replacing one or more of the lens layers with light-weight fresnels.

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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by hle38 »

Hi Foisi,

Congratulation for your work! It looks very promising !!
2 months ago I tried something similar (as well as TheLostBrain design with beamsplitter miror) but stopped because of lack of spare time and software support at this time. And thanks for the 'castorama' tips for pvc sheet! I used pvc pipes flatten with a heat gun to build my case, not very practical nor pretty :D
Maybe I will resume the work soon now I see it looks like a real alternative.

Bravo!

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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by druidsbane »

In terms of chromatic aberration, is there a coating for the lenses one could get like we currently have for eyeglasses to get rid of reflections and glare that might help in addition to even better polishing and smoothing of the lenses from the manufacturer? Would that make it feel as if the lenses are barely there?
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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by foisi »

@TheLostBrain: I'm glad a guy with such talent at making DIY stuff is interested to come out of diy-retirement after seeing something I designed :)
the fresnels are the same as in the first post : http://optolife.com/diy_projector_lens/FRL021.html

@everyone:
I'm currently finalizing the plans for the release (and it takes a longer time than I thought), what do you think about the Creative Commons licence CC BY-SA for it ?

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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by MSat »

The CC BY-SA looks more than fair enough :)

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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by 3dpmaster »

foisi wrote:I'm not sure to understand why people tend to believe that focusing would change depending on the position of the eye... for what I know the focus is set by the distance between the lens and the screen. This distance is the same for the whole FOV because the lens is parallel to the screen. There is chromatic aberration (that can be corrected in software) and spherical abberation (because the fresnels are not aspheric lenses) but it doesn't have a significant impact because the eye is near the optical center :)
Yes. There is a possibility to predistort two images that are enclined too (in the two stereo pictures or 3d game images from enclined virtual camera's) as described in previous comments. This way, every optical distortion would be resolved completely.
I wish you a lot of success with your awsome project. ;)
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FOV: 40° diagonal

HMD project:
FOV: >180°

Link: http://www.mtbs3d.com/phpBB/viewtopic.php?f=26&t=14332

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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by Okta »

Software. This is the revolution we are seeing.

Before Palmer went public with the Rift many of us including Palmer discounted this and the Rifts designs because of the lack of non 100% overlap and warping support. When Palmer presented the Rift to Carmack I think a tipping point was reached when Carmack coded the warping in to Doom 3.
Then with the blitz of the Rift Kickstarter Cybereality and MaterialDefender and many other game devs began their "Rift" wrappers and games. The next hurdle was reached when Oculus announced the the 7 inch screen. This broke my heart because of the move away from 100% overlap but I slowly realised that none of the software guys had borked at it. It really wasn't a big deal to code in the overlap shift after all :)

Now the sky is the limit for new designs like this if in theory wrappers like Vorpx could add support without to much difficulty. The next problem is market fragmentation. All the new games coming designed with Rift support may never be revisited to include support for a new design like this if it takes off.

Very nice foisi. I feel I don't even need to get back to the shed with so much ground being covered now :)
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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by Zoide »

Okta: I see you have a home brew high FoV 2D HMD in your signature. Any plans to try building foisi's design? I'd love to hear other people's impressions of it :)

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Re: [DIY] ULTRA wide FOV HMD for approx 500$

Post by Okta »

Zoide wrote:Okta: I see you have a home brew high FoV 2D HMD in your signature. Any plans to try building foisi's design? I'd love to hear other people's impressions of it :)
I would love to build it and think its a great design but time is against me. I originally set out to build a HMD with 2x7 inch displays side by side or 2x pico projectors relying on optics to keep 100% overlap but decided there were too many caveats. The Lost Brains Brains similar design is an amazing achievement but it took a lot a work and the end result is a little bulky IIRC. The big/little thing the Rift has going for it is low cost, low weight, high/ish FOV and a little Luck (pun intended). Those are the reasons it is/will be so successful.
It is possible to build another design like foisi's here but...being bigger and more expensive will be a road block in uptake. The the dreaded software support is required, and without a large take up that is a problem.

Having a Rift coming has made me a bit lazy too, been thinking more about VR controllers than displays as the Rift has become a kind of default for most of us and now we have seen a bigger focus on the other aspects of VR and some great results.

I have mentioned a few more ideas I would like to build in older threads...maybe one day.
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Re: [DIY] InfinitEye, an ULTRA wide FOV HMD for approx 500$

Post by foisi »

Guys, I have edited the first post with the current release :)

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Re: [DIY] InfinitEye, an ULTRA wide FOV HMD for approx 500$

Post by WiredEarp »

@ Okta: you are absolutely right. I've been thinking the same thing for quite a while, PC's have become fast enough to do the predistortion in software, instead of requiring lenses to undistort the image. This is a very large part of the revolution.

I know what you mean about not wanting to work on HMD's with the Rifts coming - there are so many areas of VR that require work that its probably best to focus attention on the parts that are truly lacking currently. In many ways, this is why we are very lucky to all be VR hobbyists/enthusiasts - its one of the few science areas where people without any formal training, but with great ideas, can actually make a real difference and achieve something new and special (like the Rift! - of course, to make this difference involves learning a LOT about the areas you are working on).

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Re: [DIY] InfinitEye, an ULTRA wide FOV HMD for approx 500$

Post by PatimPatam »

foisi wrote:Guys, I have edited the first post with the current release :)
Perfecto! Thanks for the detailed instructions and pictures foisi!

Unfortunately i don't have the time to test it myself (busy enough with my own DIY project), but i can't wait to hear the opinion of others who try it, especially TheLostBrain and Palmer! :-)

Also i forgot to ask before.. what do you think is the lowest screen size that could work with this type of design, while still maintaining a wide FOV? Could it be adapted to use a couple of 5 inchers for instance? I guess by bringing the screens closer to the face somehow?

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Re: [DIY] InfinitEye, an ULTRA wide FOV HMD for approx 500$

Post by foisi »

I have two 5.6" LCD at home that I previously bought for this project, but since I read here that they are not produced anymore, I updated the project with two 7" instead.
I also have 4 spare fresnel lenses of the same type (FRL021) so I can try to see how is the FoV with this configuration this evening when I get home if you want.

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Re: [DIY] InfinitEye, an ULTRA wide FOV HMD for approx 500$

Post by PatimPatam »

foisi wrote:I have two 5.6" LCD at home that I previously bought for this project, but since I read here that they are not produced anymore, I updated the project with two 7" instead.
I also have 4 spare fresnel lenses of the same type (FRL021) so I can try to see how is the FoV with this configuration this evening when I get home if you want.
Well i think that would be a very interesting experiment indeed!

I believe there are lots of screens that could be used potentially (especially with a custom board) and it would be awesome if we could get similar FOV results but with a lighter and more compact design.

http://vr.wikinet.org/wiki/Displays

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Re: [DIY] InfinitEye, an ULTRA wide FOV HMD for approx 500$

Post by Zoide »

Especially now that the market is getting flooded with ~5" 1080p displays.

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Re: [DIY] InfinitEye, an ULTRA wide FOV HMD for approx 500$

Post by MSat »

Great plans, foisi! What application did you use to draw them? I feel honored that you chose to go with the name InfinitEye :)


I'm really curious how small the display can get, but I don't want to drive this thread too off topic so I'll start a new one in the R&D forum - I hope you'll join in with your thoughts and insight.

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Re: [DIY] InfinitEye, an ULTRA wide FOV HMD for approx 500$

Post by foisi »

@MSat :
I'm using Inkscape, a free and open source vector graphics editor : http://inkscape.org/index.php?lang=en
Thanks again for the name, it sounds really good :)

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Re: [DIY] InfinitEye, an ULTRA wide FOV HMD for approx 500$

Post by Zoide »

How much stereoscopic overlap is there in real-life human vision? It looks like the InfinitEye's overlap is much smaller than that of the Rift. Could changing the angle of the InfinitEye's screens improve overlap at the expense of a bit of FoV?

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Re: [DIY] InfinitEye, an ULTRA wide FOV HMD for approx 500$

Post by foisi »

@zoide:
IIRC it is between 90° and 120°, it depends on the IPD and the size of the nose (mine is ~90°)
You are right, it can be modified at the expense of monoscopic peripheral vision. To get an idea of what is ~60° overlap (if you have ~90° stereoscopic vision like me, you can place a finger along your nose bridge and look around, to me it's not that bad :))

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Re: [DIY] InfinitEye, an ULTRA wide FOV HMD for approx 500$

Post by 3dpmaster »

foisi wrote:@zoide:
IIRC it is between 90° and 120°, it depends on the IPD and the size of the nose (mine is ~90°)
You are right, it can be modified at the expense of monoscopic peripheral vision. To get an idea of what is ~60° overlap (if you have ~90° stereoscopic vision like me, you can place a finger along your nose bridge and look around, to me it's not that bad :))
That is more than the 60° overlap from the catadioptrical hmd of H. Nagahara. :shock:
Full immersive research:

HMD:
SONY HMZ-T1
FOV: 40° diagonal

HMD project:
FOV: >180°

Link: http://www.mtbs3d.com/phpBB/viewtopic.php?f=26&t=14332

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Re: [DIY] InfinitEye, an ULTRA wide FOV HMD for approx 500$

Post by TheLostBrain »

Curious, are the PMMA fresnels that much better (optically) than the standard PVC ones?
Ex: http://www.3dlens.com/shop/fresnellens.php
My Current VR Setup
- N-Vision Datavisor 80 HMD (1280x1024, 80 FOV at 100% Overlap)
- Ascension Technology Flock of Birds 6DOF Magnetic Tracking + Extended Range Transmitter
- Prototype HMD (~100 FOV) - Specs and design to be shared after patent issued.
- IZ3D for non stereo-ready apps
- GlovePie for TrackIR emulation for apps without native Ascension Tech FOB Support
http://www.thelostbrain.com/?tag=/head+mounted+display" onclick="window.open(this.href);return false;

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Re: [DIY] InfinitEye, an ULTRA wide FOV HMD for approx 500$

Post by BillRoeske »

You and geekmaster have both been doing some pretty cool work in this area. Nice job! :)

A quick question from the hardware under-informed: are OLED screens significantly lighter than fluorescent-lit (or even LED-lit) LCD panels? Anyone have round ballparks by how much? Obviously they're not yet common or cheap for hobby projects, but I was curious (especially with weight being one of the primary downsides for a dual-display system).

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Re: [DIY] InfinitEye, an ULTRA wide FOV HMD for approx 500$

Post by KBK »

TheLostBrain wrote:Curious, are the PMMA fresnels that much better (optically) than the standard PVC ones?
Ex: http://www.3dlens.com/shop/fresnellens.php
PMMA is a bit better. It becomes a notable issue when you stack three of them. Go for coated, obviously. 6 sides is 0.5% per side as a cumulative(? IIRC), so it's not pretty, in the end. It's resolution and contrast loss, then add in a cheaper plastic. Ugh. The kind of smear to be encountered with PVC, might make me want to clear the gunk out of my eyes all the time.

The problem is the loss of contrast in low contrast scenes. I'm sure many of you folks know this already, though. IIC, the eye is stated to run at about 350:1 CR, but in practice it is higher than that. digital devices have problems reproducing contrast, not so much of a problem in the CRT end of projection. digital is only now getting close to what CRT could do, so it's not such a good idea to loose any on the lensing or in any other aspect. Every bit counts.

If you plan to slap them into a shaping mold and curve them, then the PMMA is probably the way to go. It's good enough for eye use, so it should be good enough here.

I've done large RP and front projection experiments (dual sided as well) with both types of plastic and find the PMMA to be the better choice there.

Regarding patents (reading your sig), I filed one in 2008, it only made it through recently. Things are a bit backlogged in the system, to say the least.
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