This page
illustrates the progressive coding technique for isosurfaces as
described in the paper "Progressive
Encoding of Complex Isosurfaces". We also provide, for evaluation
purposes only, an implementation
of the paper. The application can open volume files with an extension
.iso containing scalar values defined on a regular 3D grid which range
from -1 to 1. An isosurface with a predefined isovalue 0 will be
extracted after transforming scalar values to binary signs as inside or
outside the isosurface. During the extraction, a binary octree file with
geometry can be saved and read by specifying or dragging a *.bbm file
into the tool. The given tool allows the user to progressively encode
this binary volume data with geometry in 4 files (*_header.txt, *.sign,
*.leaf, *.geo), then progressively decode or decode in full.
Several options
(quantizations) are available for encoding. We list the resulting
bit-rates, given in bits per vertex for geometry and connectivity, as
well as the final size of the compressed version. The executable has
been compiled for a Win32 platform (Windows 9x/NT/2000) and uses the
OpenGL library. We suggest that you take a couple of minutes to see how
to tune
the encoding process on a volume example.
Downloads
Executable
(668 KB, Windows 9x/NT/2000 application, requires OpenGL).
Models in .zip format
(PLEASE, if you use these meshes, acknowledge where they are coming as
indicated):
Bonsai,
Engine,
MRI-head,
Courtesy of Rezk-Salama
et al.
HeadScan,
Dragon,
Buddha,
Feline,
Courtesy of Caltech and Stanford Graphics Group.
Scientific
Simulation Data, Courtesy of Mark Duchaineau,
LLNL.
Temple,
Courtesy of Scott Schaeffer.
Triceratops,
Eight, Horse, Sphere by applying Sean
Mauch's Close Point Transformation to meshes
Paper (4.9
MBytes)
Slides
(8.2 MBytes)
Note
The source files are not
available, and we will not provide any additional technical support
other than what is in the how-to
section.
Acknowledgments
The code was written by Haeyoung Lee. The current implementation
uses one version of the Adaptive Arithmetic Coding
Source Code developed by Fred Wheeler.