Game Development Reference
In-Depth Information
Figure 24-10. Lenticular lens screen
Here microscopic domed lenses are placed between the viewer and the screen. The lens
focuses the light such that only certain pixels are seen by each eye, due to the slightly
different angles by which the eyes view the lens. Benefits over the parallax barrier are
that the position of the user is less restricted and the image is brighter. With both parallax
barriers and lenticular lens arrays, it is possible to retrofit current screens with remov‐
able slide-in-place filters that allow for viewing of 3D content designed for use with
those filters. At the time of writing, several large TV manufacturers are doing active
research into widening the field of view of these technologies for use in a home enter‐
tainment environment.
Advanced Technologies
The displays we have discussed so far have all lacked some level of realism. For one, the
eye doesn't have to refocus to observe objects at different depths, so your brain isn't
totally fooled. Additionally, when you move around the object being projected and it
doesn't change view, you still see the object at whatever angle the object was recorded.
If you were viewing the world through a window, you could walk to the right and see
more of the left-handed view. However, try as you might, you can't see around the corner
of a building in a video game by moving your head at an angle of the screen. While it
might be possible to recreate that effect with some sort of head tracking, there are some
beyond-state-of-the-art technologies that could take this steps further.
One technology that is commonly thought of being able to produce 3D images is the
holograph , a staple of science fiction. It seems like we should be able to just whip up
 
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