Hello there. The width value on the tutorial only works in cybereality's case and it must be read as an example. Your should especialy pay attention to the "interpolation" part of the tutorial.

In the case of the LG Optimus 3D, the problem of depth at the sides may come from the content itself. Some years (decades?) ago people at Stereographics (Lenny Lipton) said that for autostereoscopic displays it was better to push the convergence plane out of the screen for best effect, which generates window violations at the edges.

I've experimented this myself with most of the content available for the 3DeeSlide (lenticular lens for the iPhone). I'm not sure it was such a wise decision to do this, I didn't find any justification to this rule.

I have the Nintendo 3DS, and I have tested the HTC Evo 3D, there is no issue with the side of the screen.

I mean that its ok to print horizontal lines instead of vertical lines on A4 paper ? bec it will help me to cover more area of screen

In A4 8.2*11.6 inch paper i can print horizontal 8.2 inch sized lines with 14 pixels?

Thanks Luthor70 and Cyberreality

i tried to understand the Interpolation part
my ppb is 14.6891
so i need to make pattern something like 1 black line and 1 white line with 15px and then 1 black like with 14 px ?
i am really confused ple someone help me..........

qingdao11 : The lines must be vertical at the screen, but you can print them horizontal, then rotate your sheet at 90°.
If you print using a resolution of 1440 your ppb is actualy 14.6891 (assuming your printer can do 1440 in b&w. Read well the doc of your printer). This number only works for your LCD grid itself, but your barrier will not lay exactly on the LCD (it must be set a few mm in front of the LCD (I personnaly put a picture frame glass between them)), the right number is a little bit smaller .. maybe around 14.5 or 14.6. As you can't directly enter complicated numbers( just whole numbers), you have to use interpolation. One 14 and one 15 gives a 14.5. One 14, one 14, one 14 and one 15 give : (14+14+14+15)/4 = 14,25. In this example this would give :
- one black line made by 14 pixels
- one white line made by 14 pixes
- one black line made by 14 pixels
- one white line made by 15 pixels.
Now you have the source pattern, you just have to save it as a motif, then finaly fill your sheet with it. Also the right number may be more complicated, maybe 14.552 or 14.621, so you have to create more complicated series of numbers for the interpolation.
I hope this will help you, but I advice you to read again and again the tutorial, it's well done, thanks to cybereality. Good luck.

14.5px might be close enough, meaning one blank line with 14px width, and a black line of 15px width. However you may need to tweak this further depending on your setup.

Thanks again....i just have 6 papers so i have to be careful...ok today i am gonna print it,very excited...i am going to use Epson Stylus Photo R290 - 5760 x 1440 optimised dpi with 3pl minimum droplet size and other printer is Canon PIXMA iX4000 with 4800* x 1200dpi but i will use R290...

you can go to near by print shop in your city....they will have some better printer...you can print there....very cheap

True, but it's a pita if you don't know the exact measures for the barrier. In my experience this practically has to be tested several times before you hit right.

Just a few questions :
- Do you notice more ghosting with this paralax method than with simple anaglyph glasses ? For me, the answere is absolutly yes.
- Is tere any solution to make a more opaque barrier with a printer ?
- Would you use this more than 5 min, I mean have you ever tried to watch a full movie ??

There is some ghosting with this method, particularly because its DIY, but its not horrible. I also get ghosting with Nvidia 3D Vision. You can't avoid it unless you use HMDs.

Make sure when you print, you go into the printer settings and choose "black & white" and the "best quality". That will make thicker lines.

I have played games with this, for as long as 30-45 minutes. Not sure I would want to sit and watch Avatar with it, but I guess you could do it. The issue isn't the picture quality so much as that you have to sit in a fixed position. The quality itself is actually not bad.

Thx for the answeres cyber. I'll try to play with my driver's printer to see if it can send deeper blacks.
That's such a pitty that the viewing angle is so small because the 3D is really impressive. I would say the main issue is the horrible viewing angle, then the low resolution of the image. I can't imagine what would give this diy with a real HD resolution !

I have a macbook pro 13' mid 2010 and would love to get this working. I really don't understand the method of doing this. The screen resolution 1280x800, PPI 113, 13.3 Inch screen. If you can help me out it would be greatly appreciated.

You are basically just printing out black lines that will block every other column of pixels. The tricky part is getting it to match your screen exactly. Takes some experimentation.

This is what i got so far. I'm not too sure how much thickness it is for the glass in front of the LCD screen.

That means the lines and the spacing are too small. You have to widen it out a bit:

Hi Cybereality what is your screen pbb ? and which pattern you are using ?

Its all explained in the tutorial:
viewtopic.php?p=55961#p55961

ppb is 15.987401568 so you used 11 lines at 16px and then 1 line at 15px ? last perfect pattern for you ?

Yes, that's correct.

ok
My screen ppb is 14.6891
so i tried 14.5 px but its to small and 15px is too big
then i tried 3 line with 15 and one with 14 = 14.75 still too big
so now what to do ?
can i use 4 line of 15px and 2 line of 14px ? 14.6666 very close

Well that would be the same as 2 lines at 15px and 1 line at 14px. If that doesn't work you can try 5x 15px and 3x 14px or something like that.

so can i use 2 lines at 15px and 1 line at 14px ? but its not even....you said that we have to use even number
just one paper left so i want to make a final print....

ya i tried 5x 15px and 3x 14p...its the best so far...almost half screen with blue and red color so i think just have to widen a little bit

Yeah, you're right. It has to be even in order to tile correctly. Forgot about that.

Sounds like you are getting close. Maybe 15 x4 + 14 x2 will work better for you.

i tried 15 x4 + 14 x2 but its not working...bit bigger...when i go back from screen then it turn white but cant see 3d but can see two different image from different points...i am so sad...what to do now ?

Well if you can see two different images, then it can be 3D. You just have to get the position correct so each eye sees a different image (one for left, one for right). Then if you play 3D content, like with the Stereoscopic Player or IZ3D driver, it will be in 3D. If the viewing distance seems wrong you can try flipping the sheet over (so the printed side faces the monitor), or adding a blank sheet in between.

Hey cybereality
Can I watch 3d movie with this setup ?

Hi! I'm french guy and I saw your video (Cybereality) on YouTube. I read the entire tutorial but I have some questions:

First:
My screen is an Asus VW220D 22" which has a dot pitch of 0.277mm so 0.0109055118 inches. My printer can do 1440dpi so my result is: 0.0109055118 X 1440 = 15.703936992

If I do a patterin of 16px X 1px, it's too big. I have read the part about interpolation, but I'm french and I don't really understand what I must do in order to have a better pattern.

Second:
In France, a piece of paper isn't = to 8.5 X 11 inches but 21cm X 29.7cm (so 8.26771651 X 11.6929133739 inches). Can I do a barrier with this size? Is that the result will not be distorted?

Thank you for your understanding!

@hlmasterchief93: You can watch 3D movies, as long as they can be played with the Stereoscopic Player. So NOT Blu-Ray 3D, but basically anything else.

@jon08: The interpolation means you sort of "fake" a higher resolution. In your case, 16 pixels is too much. So what you want to do is make something like 3 lines at 16 pixels and then 1 line at 15 pixels. So the pattern will look like

| 16px | 16px | 16px | 15px | ...

This will end up being close to 15.75 pixels, which is almost what you need. That actually might work, but you will probably have to tweak it further. But that should give you an idea.

Ok! But how to do 3 lines at 16px and then 1 line at 15px? Using the pattern, my whole layer is covered.

Do I need a pattern containing several black lines?


EDIT: I found this combinaison: 5 lines at 16px and then 2 lines at 15px = 15.71. It's ok?
EDIT 2: I found an other combinaison: 12 lines at 16px and then 5 lines at 15px = 15.705882352!! So a difference of 0,0019453609411! It's good or it's better to use small combinaison (because 12 lines + 5 lines, it's bigger than 3 lines + 1 line )

It won't exactly correspond to your display anyway. First because the pitch may not be exact, second because the glass between the pixels and the surface of the display is refracting the light and altering angles and distances. This depends on the refractive index of the glass and its thickness, and you should also consider the distance between your parallax barrier and the screen. The best solution is to try with something close to what you've measured and to modify the pattern untill it looks ok.



Ça ne correspondra de toute façon pas exactement à ton écran. D'une part parce que le pitch n'est pas forcément exact et d'autre part parce que le verre entre les pixels et la surface de l'écran réfracte la lumière et modifie les distances et les angles. Cette modification dépend de l'indice de réfraction du verre et de son épaisseur, mais tu dois aussi tenir compte de l'écartement de ta barrière par rapport à l'écran. Le mieux est d'essayer avec une valeur proche de celle que tu as calculée et de modifier le motif jusqu'à ce que ça rende bien.

The pattern needs to be an even number of lines, or it won't tile. Thats why I suggested 3 lines at 16px and 1 at 15px (making 4 lines total). You can experiment with different combinations, but they need to add up to an even number.

Ok. I tried to make a pattern of 12 lines at 16px and 5 lines at 15px but I have a problem. My pattern ends with black which creates a "loop". A picture says more than words:


Ok, I see. I'll try to find a better combinaison

Read my post above. The pattern needs to have an even number of lines (like 2, 4, 6, 8, etc.).

Yes, I saw yout post later ^^'

I think that 1,75 is the best that we can have (3*16px + 1*15px).

Only one way to find out...

I go to sleep and I'll try this tomorrow (it's 3:00 am here )

Im trying to make this for my phone, so no Stereoscopic Player

You would need to find software that could play 3D videos in vertical interleaved mode. I don't believe there is anything that does this for phones, you would have to create that yourself.