Customizable and flexible variant of DIY stereoscopic viewer for smartphones, made with commonly available materials and compatible with Google Cardboard. Open-source DIY VR kit was developed by Hrvoje Spudić and Damir Prizmić as part of radiona.org educational program.

Our prefabricated kits support smartphones with flowing dimensions:

• design A) unlimited height and up to 153mm width
• design B) unlimited width and up to 77mm height

In case you phone doesn't fit we recommend you modify the design to your requirements and 3d print or laser cut the plastic case.

Both Android an iPhone platforms are supported. It is preferable that smartphone has gyroscope sensor, you can google your phone for specifications to find out. Note also that it can still work without it, but its since gyroscope is the main sensor used for detecting movement it will be mostly useful for looking at static stereoscopic images (3D).

* if 60mm screws are not available, use M3 threaded rod cut to length and 4 more M3 cap bolts at the end of each rod.

1. Start with the upper plastic plate containing holes for the lenses (01)
2. Fix and tighten long screws (05) to the plastic plate
3. Prepare the lenses (04) – using pliers break the three tabs (try not to damage or scratch the lenses)
4. Put on the lenses (04) – they should be sandwiched between two plastic elements (02). Note the orientation of the lenses – more convex (more curved) side of the lens should be facing towards the screen.
5. Put the rubber bands (09) to the bottom plastic plate (09).
6. Connect the upper and bottom plaste and adjust screen to lens distance. Start with 50 mm distance between and the plastic plates. If the image is not sharp while watching trough the lenses, then distance should be adjusted closer of further
7. Fix the remaining screws

Interpupillary distance is distance between the centers of the pupils of the two eyes. This should be adjusted to the face properties of the viewer (normal range for most individuals is between 54 and 74 millimeters). Ask someone to help you measure the distance using ruller. While measuring look at the distant object. Note this number for later viewer calibration.

Use the Viewer Profile Generator to define your device's key parameters. Add the QR code to your viewer so every Cardboard app will automatically adapt to your viewer. You will need PC with which you will change parameters while looking at the calibration image on the smartphone.

https://vr.google.com/cardboard/viewerprofilegenerator/

If you smartphone doesn't support WebGL technology and cannot run Google Profile Generator, there are few options. For example VR Calibration for Cardboard on Android. Changes made with this tool are NOT saved anywhere and will NOT affect your smartphone's Cardboard profile directly. Once you are happy with the VR viewer parameters please visit the official Cardboard profile generator page to create a new VR viewer profile based on your discovered parameters.

https://play.google.com/store/apps/details?id=com.anrael.vrcc

For buttons select these options:

• Primary button type: Touch
  
• Screen vertical alignment: Center

There are a lot of apps for VR smartphone viewers. Just search for “cardboard” or “VR”.

Android:

• Google Cardboard https://play.google.com/store/apps/details?id=com.google.samples.apps.cardboarddemo&hl=en
• Youtube (search for “360 video”)
• Cardboard Camera https://play.google.com/store/apps/details?id=com.google.vr.cyclops
• Google Street View https://play.google.com/store/apps/details?id=com.google.android.street
• works without gyro Sites in VR https://play.google.com/store/apps/details?id=air.com.ercangigi.sitesin3d&hl=en
• works without gyro PlainVR https://play.google.com/store/apps/details?id=com.plainconcepts.vr&hl=en
• works without gyro VaR's VR Video Player https://play.google.com/store/apps/details?id=com.abg.VRVideoPlayer
• works without gyro 3Dsteroid https://play.google.com/store/apps/details?id=jp.suto.stereoroid&hl=en

Demos:

• War of Worlds VR https://play.google.com/store/apps/details?id=com.https://play.google.com/store/apps/details?id=com.MWB.BAMF&hl=enBDH.WarofWords
• Apollo 15 Moon Landing VR https://play.google.com/store/apps/details?id=com.ThomasKole.Apollo15VR
• works without gyro Space VR demo for Cardboard https://play.google.com/store/apps/details?id=com.sriley.game.cardboard

Games:

• Gravity Pull https://play.google.com/store/apps/details?id=com.VRMersive.GravityDrop
• BAMF VR https://play.google.com/store/apps/details?id=com.MWB.BAMF&hl=en
• VR Jump n Run https://play.google.com/store/apps/details?id=nl.bigcathq.vrjumpnrun
• works without gyro Space VR for Cardboard https://play.google.com/store

iOS:

• War of Worlds VR https://itunes.apple.com/us/app/war-of-words-vr/id944293466?mt=8