- There are sufficient similarities in JuxtaView and Vol-a-Tile
that in the next generation design, a single framework should
be able
to support both requirements.
- This framework will be called
SAGE- the Scalable Adaptive Graphics Environment.
- SAGE will consist
of two major components: a rendering component, and a display management
component.
- The rendering component deals with the conversion of raw
data into visualizations.
- The display management component deals
with the routing of the rendered pixels to the displays themselves.
- This
model permits both localized and remote rendering and multicasting
for collaborative work.
- To support rendering of ever growing data
sizes SAGE must adopt multi-resolution techniques using some form
of compression mechanism
such as those in JPEG2000 using wavelets, or use a technique similar
to mipmapping. Furthermore view-dependent rendering techniques
must be used to help reduce the portion of the data that is in
the visible
view frustum.
- To support time-varying data sets, Time Space Partitioning
trees (TSP) should be used to encapsulate both geometry and time.
However
significant modification of the TSP concept must be made to accommodate
the various multi-resolution and view-dependent compression mechanisms.
- At
some point, the data sets will simply be too large to render in real
time. In this case, real time rendering will only be used
to give the viewer a low resolution image that the user can manipulate.
Then, as the user releases control to SAGE, rendering will use
either ray casting or sort-last rendering algorithms to fill in
the details.
Visual effects such as gradually fading between the higher resolution
and the lower resolution images can be used to reduce any abrupt
transition
between the two levels of detail.
- A scene graph hierarchy is needed
to manage collections of TSPs. Each TSP would represent one data
object that needs to be rendered.
Singe geosciences data sets usually come in multiple layers/dimensions,
one would need multiple TSPs- one per layer. Each of these TSP
layers could conceivably be rendered separately and composited
using sort-last
rendering when rendering in full resolution mode.
- SAGE’s display
manager should also be able to support incoming AccessGrid video
streams and integrate them as part of
the visualization
environment.
- Targeted display devices for SAGE are
- GeoWalls,
- GeoWall2s,
- Personal GeoWall 2s,
- Varriers.
- Papers at:
- "IEEE Visualization" papers between 2000 and 2004
- EVL reviews:
|
