View 3D photos from the food market "El Mercat de La Boqueria", Barcelona, ES.
The app demonstrates the Cardboard viewer feature used in the 3D/VR Stereo Photo Viewer app.
Also look at http://www.tekla3d.com
Roll Cardboard viewer to right to zoom in and see image detail, and roll left to zoom out.
Re-position the viewing window by moving viewer left/right (yaw), or up/down (pitch).