Anaglyph views achieve a 3D look with red and blue glasses.
The red lens goes over the left eye, and views an image in red
that is displaced to the left as a function to elevation (for
vertical views) or distance out (for perspective views).
Anaglyph photographs go back to the 1850's.
Anaglyph maps: Right click on the map, and pick the
"3D map options" choice from the pop up menu.
- Stereo Anaglyph: creates a new reflectance map
with a shift of the red bit plane. You can change
the maximum shift, as well as the reflectance
parameters, by right clicking on the map display.
- Stereo Anaglyph/Merge: uses the image on screen,
and shifts the red bit plane to the left. This
may or may not be effective depending on the
imagery displayed. You will be asked for a
perspectives: select this option when
setting the perspective parameters. This can be done with
either a reflectance or a drape perspsective. Select the anaglyph option on the
Stereo tab of the
perspective options form.
- Anaglyph displace: one view, with the red bitplane
shifted to the left. You set the maximum shift
for the foreground, which decreases to a minimum
at the back of the view.
- Anaglyph, two scenes: two separate views are drawn, each
shifted a specified distance from the observer's
location. The red view is shifted to the right
and the blue/green view is shifted to the left. You can adjust
the eye separation; the correct distance will
depend on the resolution of the DEM and overlaid
imagery and the distance to the main features in the view.
Depart from the default value only carefully, and decreasing the
separation is probably better than increasing it.
Alternative 3D viewing
- Chromadepth options provide a
alternate 3D visualization, and requires different glasses.
- Polarized glasses require two projectors. One projector has a vertically
polarized filter, and is viewed by one eye with the matching filter.
The other projector uses a horizontally polarized filter, and provides an
image to the eye which has a matching filter.
- Shutter glasses change frequently (120 times for second), in sync with
the glasses. The eyes alternate viewing the two different scenes, but
the changes are fast enough that the brain fuses the two different
perspectives and sees 3D. The shutter glasses need batteries.
This was the technology for 3D TV, which did not quite catch on.
- Occulus Rift, and similar devices like Google cardboard which split you
cell phone screen.
Last revised 11/26/2017