4.3 Stereo 3D Viewing
The "Funny Glasses" (stereo 3D) parameter screen is presented only if
you select a non-zero stereo option in the prior 3D parameters. (See 3D
Mode Selection (p. 106).) We suggest you definitely use defaults at
first on this screen.
When you look at an image with both eyes, each eye sees the image in
slightly different perspective because they see it from different
places.
The first selection you must make is ocular separation, the distance the
between the viewers eyes. This is measured as a % of screen and is an
important factor in setting the position of the final stereo image in
front of or behind the CRT Screen.
The second selection is convergence, also as a % of screen. This tends
to move the image forward and back to set where it floats. More positive
values move the image towards the viewer. The value of this parameter
needs to be set in conjunction with the setting of ocular separation and
the perspective distance. It directly adjusts the overall separation of
the two stereo images. Beginning anaglyphers love to create images
floating mystically in front of the screen, but grizzled old 3D veterans
look upon such antics with disdain, and believe the image should be
safely inside the monitor where it belongs!
Left and Right Red and Blue image crop (% of screen also) help keep the
visible part of the right image the same as the visible part of the left
by cropping them. If there is too much in the field of either eye that
the other doesn't see, the stereo effect can be ruined.
Red and Blue brightness factor. The generally available red/blue-green
glasses, made for viewing on ink on paper and not the light from a CRT,
let in more red light in the blue-green lens than we would like. This
leaves a ghost of the red image on the blue-green image (definitely not
desired in stereo images). We have countered this by adjusting the
intensity of the red and blue values on the CRT. In general you should
not have to adjust this.
The final entry is Map file name (present only if stereo=1 or stereo=2
was selected). If you have a special map file you want to use for
Stereo 3D this is the place to enter its name. Generally glasses1.map is
for type 1 (alternating pixels), and glasses2.map is for type 2
(superimposed pixels). Grid.map is great for wire-frame images using 16
color modes.
This screen is not available if you have selected a ray tracing option.