3D glasses provide the ability to put two totally separate images on a screen at once. Normally, the technology this is used to provide a stereo-3D effect (Figure 1).
But we could use this same technology to show subtly (or entirely!) different films to different groups of people in an audience.
Fig. 1: Each lens lets through a specific type of light. Here, the colored lenses separate out red and green light.
Instead of everyone’s glasses having both a left and a right lens, we can instead supply a LEFT/LEFT set of glasses and a RIGHT/RIGHT set of glasses, as seen in Figure 2. (We could also apply this idea to three groups—imagine another audience member with a BLUE/BLUE set of glasses.)
Fig. 2: One person would get a pair of glasses that was only the “left” lens, and the other would get only the “right” lens. Now we can display a different image to moviegoers (or game players) #1 and #2.
Possible applications in film:
- In horror movies, one group of people could get the “ultra gory and horrifying” version of a film, while the other group gets a tastefully understated version with minimal blood and guts.
- Additional horror movie option: for people who hate jump scares, the video footage accompanying the traditional “jump scare loud violin noise” could just be video of an actual violin, rather than of a cat and/or hockey-masked killer jumping out of a closet.
- Two version of a film could be shown at the same time in a theater (for example, a PG-13-rated film and an R-rated film).
- For example, if a film is rated R for brief nudity, the PG-13 version of the film could be generated by adding a bunch of computer-generated tumbleweeds. Ratings problem solved!
- In a Sherlock-Holmes-style mystery, some people are annoyed by the fact that it’s usually impossible to “play along” with the mystery solving—instead, you wait until the detective reveals the obscure clues at the very end. With this “two movie” approach, the crucial evidence could be pointed out (e.g. with a red circle / arrow), so that the viewers would know which evidence Sherlock Holmes thought was important. But if you didn’t care about that, you could still watch the original cut!
* For the benefit of people with face blindness (https://en.wikipedia.org/wiki/Prosopagnosia), a hovering name tag could be added above each actor’s head (like the floating name tag present in many multiplayer games). This would also help normal people in shows with a large cast of characters (like Game of Thrones or Arrested Development).
Possible applications in games:
- You could have a game in which player #1 has the controller, but can only see a limited view of the world, while player #2 has no controller, but can view critical on-screen information that is not visible to player #1. For example, player #2 could have a map, or perhaps be able to see certain invisible walkways / invisible enemies / secret passages, etc.
Fig. 3a: In the haunted house movie above, we want to only show the full Grim Reaper to one portion of the audience members (the other viewers should see the glowing eyes but not the specter itself). See figure 3b for a description of how this is done with a traditional set of red/green glasses.
Fig. 3b: A colorized version of 3a, ready for 3D-glasses viewing. Yellow = shown to all viewers. Green = only shown to the “right lens glasses” viewers. In this case, the flying Grim Reaper thing will only be visible to a green lens-wearer. See figure 3c for specific images.
Fig. 3b: Top: “red lens” view where only the eyes of the haunting specter are visible. Bottom: “green lens” view where the entire Grim Reaper is visible.
PROS: Creates additional jobs in post-production. Allows multiple versions of a film to coexist without compromising a director’s original vision.
CONS: Prevents the use of 3D. May increase production costs.
Footnote: Existing applications for console games:
This “show two totally different images” technology has been commercially available for split-screen video games as a semi-standard feature of 2012-era 3D televisions.
The screen could be split (either vertically or horizontally), and one half of the screen would go to the “left” 3D channel while the other would go to the “right” 3D channel. In this fashion, players with left/left and right/right glasses (as seen in Figure 2) would get an entire full screen all to their own. (This also greatly reduced opportunities for screen-looking, although some light still leaks through.)
Unfortunately for this technology, both split-screen games and 3D televisions appear to be a thing of the past.