Want to know more about it? Here
is a paper that will be presented at the Late Breaking Hot Topics session
at the 1999 Visualization conference.
Here are intermittent IBR frames that were obtained using just one 'key
frame'. Actually, a key frame is not just a single image, but consists
of a set of slab images. Each of these slab images is a volume rendering
of an image-aligned volume slab, enhanced with object geometry that is
generated on-the-fly during the volume rendering. To demonstrate the range
of views that can be obtained from one key frame, we started from the angle
at which the key frame was originally obtained and then rotated out.
We observe that artifacts start to appear around 16 degs. Generally,
transparent datasets, such as the tomato, and dispersed datasets, such
as the nerve, allow larger angular deviations than opaque, more regular
objects, such as the head. Thus the IBR rendering allows the viewing angles
to be varied within a cone with angle 16 degs. Hence, the user can tilt
the object back and forth within a range of 32 degs. The IBR framerate
was close to 30/s for all cases. In our full IBR-assisted volume rendering
system, new key frames are supplied as the user rotates out of the current
key frame's active range.
Finally, here are some quicktime clips with real-time screen captures of the IBR system at work. Again, just one key-frame was used.
LBNL tomato dataset
Ganglion nerve cell
The underlying, on-the-fly generated
geometry mesh associated with the UNC head dataset
to Research Homepage