Freeciv WebGL has been released with a new version today, which supports Anaglyph 3D with red and cyan 3D glasses. This was made possible thanks to the Three.js 3D engine which is used by Freeciv WebGL.
“Anaglyph 3D is the name given to the stereoscopic 3D effect achieved by means of encoding each eye’s image using filters of different (usually chromatically opposite) colors, typically red and cyan. Anaglyph 3D images contain two differently filtered colored images, one for each eye. When viewed through the “color-coded” “anaglyph glasses”, each of the two images reaches the eye it’s intended for, revealing an integrated stereoscopic image. The visual cortex of the brain fuses this into the perception of a three-dimensional scene or composition.”, accoding to Wikipedia.
To play Freeciv WebGL in anaglyph 3D mode, enable it in the settings dialog and play with 3D glasses such as these:
Image credits: Wikipedia