Using special lenses one eye sees one screen and the other eye another screen, showing different positions for the same object creates the sense of dept.
Same for virtual reality headsets (instead of special lenses it uses 2 lenses to project 2 different images)
- Screen and Lenses
- Dolby 3D systems (red and blue lenses) [Color Filters]
- Real D systems [Polarizing Filters]
- Xpand 3D systems [Eclipse Method] (Expensive but very good performance)