The camera mode refers to any of several
stereo and mono viewing options.
The camera mode of the Chimera graphics window can be controlled with
the command stereo,
the Camera tool,
or the menu raised by double-clicking the eye position in the
It can also be specified at Chimera startup with
The Image type
(camera mode for output image files)
can differ from the mode shown in the graphics window.
Available camera modes:
- mono - standard single view, not in stereo
- stereo left eye - single view from the left-eye position
- stereo right eye - single view from the right-eye position
- cross-eye stereo
- side-by-side views, with the left-eye view on the right
and the right-eye view on the left
- wall-eye stereo
- side-by-side views, with the left-eye view on the left
and the right-eye view on the right
red-cyan stereo (also known as anaglyph)
- overlapping left-eye and right-eye views in different colors, to be viewed
with "glasses" (often inexpensive cardboard/plastic) with colored filters.
The red channel is used for the left-eye view,
green and blue for the right-eye view.
This setting works best with red-cyan glasses, but reasonably well
with red-blue or red-green glasses. Some ghosting will always be present
unless the glasses are perfectly matched to the frequencies of light
emitted by the display. Stereo cues will be greater when colors
with a balance of red and blue/green components are used, for example,
grayscale, magenta, and yellow rather than red, green, blue, or cyan.
The red, green, and blue component values of a color can be viewed by
entering its name in the
- sequential stereo
- rapid flickering between left-eye and right-eye views,
to be viewed with special synchronised glasses.
Sequential stereo is not always available.
- reverse sequential stereo
- as above, but swapping the two views to accommodate devices that
use the opposite convention
- row stereo, right eye even
- row-interleaved stereo, with even rows used for the right-eye view
and odd rows used for the left-eye view.
Row-interleaved stereo is used by 3D displays from
Zalman, and others.
Users of these devices can try both row stereo options in Chimera
to see which gives the best result.
- row stereo, right eye odd
- as above, except swapping the two views to accommodate devices that
use the opposite convention
- angular fisheye of the hemisphere in front of the camera,
with horizontal field of view
locked to 90°
- truncated dome
- same as the dome mode, except with the bottom of the hemisphere cut off
- DTI side-by-side stereo - for stereo viewing with
Sequential stereo is only supported on workstation-class graphics cards
with graphics drivers configured for stereo (e.g.,
ATI FireGL/FirePro and NVidia Quadro graphics cards for Windows and Linux,
NVidia Quadro for Mac OS X).
For sequential stereo on Macs, the Aqua version of Chimera
may be preferred over the X Windows (X11) version. The latter requires
enabling X11 for stereo by entering the following in a Terminal window:
defaults write com.apple.x11 enable_stereo -bool true
X11 must be restarted after this setting is changed.
The setting is saved in the ~/Library/Preferences directory and will
apply to future sessions.
UCSF Computer Graphics Laboratory / August 2012