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 OpenDX (dx) is public domain
visualization software that can display 2D or 3D data. It can do volume
visualization, isosurfaces, cutting planes, streamlines, image processing,
molecular modeling, animation, scalar and vector glyphs, and many other kinds
of visualization. It runs on various UNIX machines (including Linux) and
Windows.
The Cornell Theory Center
is a repository for Data Explorer information and examples. The repository
contains a wide variety of application-specific examples, as well as general
tools. There is also a news group called
"comp.graphics.data-explorer."
OpenDX Image and Animation Examples
Figure 1 shows a 3D
visualization of the fluorescence intensity of cells as detected in a flow
cytometer on three photomultiplier tubes, where each is associated with a
different color filter. The FL1, FL2, FL3 data values are the intensity of each
cell for each of the three colors. Each cell is represented by a sphere plotted
at its (FL1, FL2, FL3) coordinates, and colored by the RGB value formed by the
three intensity values.
The cells in this experiment have been stained with three different
fluorescent tags that reflect different aspects of immunological competence.
Visualizing the cells in 3D allows for insights into the complex clusters that
the mixed cell populations form. The data is from experiments associated with
an NIH Program Project at the Dartmouth Medical School (Charles R. Wira, PI) on
the "Immunology of the Female Reproductive Tract." The
experiment was a collaborative effort between Hillary D. White, Ph.D., Alice L.
Givan, Ph.D., and Karen Crassi.
Figure 2 (1.4 Mb mpeg
movie) shows a 360-degree rotation of the 3D visualization. Figure 3 (1.8 Mb) shows a
QuickTime version of the movie.
This example illustrates the results of a study of Antarctic sea ice from an
ice station in the Weddell Sea. To identify the external forces responsible for
the sea ice processes, six buoys were positioned on the iceflow, and their
drift velocities were measured, along with wind and ocean current measurements
during a four-month period in 1992.
This animation shows a
portion of the four-month time series. The sea ice drift and deformation
processes are displayed on the graphs in the left part of the window, and the
position of the iceflow in the Weddell Sea is shown on the right side of the
window. The buoy velocities filtered with a nine-hour low pass filter displayed
at the top left illustrate the high frequency processes that are driven by the
12- and 24-hour daily tides, as well as the low frequency processes caused by
winds from storms and steady ocean currents. The 30-hour low pass filtered
velocities at the bottom left show only the low frequency processes.
This data and animation is part of the doctoral research of Cathleen Geiger,
Thayer School of Engineering, Dartmouth College.
The air flow in normal human airways and those with sleep apnea was modeled
using FLUENT. The results were taken from FLUENT and visualized using DX. Figure 1 shows the surface
pressure surrounding a normal human airway. Figure 2 shows the streamlines of
air flow velocity that have been colored by the internal pressure. Figure 3 is an animation (~1MB)
that shows the view inside the airway as the camera is positioned on one of the
streamlines and moved along the streamline from the entrance, to the airway,
down through the curved airway, to its end. The images and data are from the
doctoral dissertation of Yong Zhou, who completed his Ph.D. in Biomedical
Engineering at Thayer School of Engineering at Dartmouth in May 1995.
This group, which is part of the Physics department at Dartmouth, does
research into the very early origins of the universe. This spinodal
decomposition animation
(~5Mb) was produced by Carmen Gagne, a graduate student working with Marcelo
Gleiser.
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