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## Reconstruction

### Alpha Shape and Shape2D

Alpha shapes provide a nice mathematical definition of the
``shape'' of a set of points, particularly useful for making
molecular models.
*Alpha Shape* produces a set of tetrahedra, triangles and edges
connecting the points.
*Shape2D* does the same thing for points in the plane.
The alpha shape software has a new release and a sharp looking
Web page!
Documentation, references, credits and code are all available there.
For a very clear explaination of what alpha shapes are, try
this page by Patrick Moran.

By a team at the University of Illinois at Urbana-Champaign.

The convex hull program hull also computes
alpha shapes.

### Nuages

3-D model reconstruction from 2-D slices.
Binaries for various machines.
Now includes a database of contour data.
Web on over to
INRIA for more details.

By Bernhard Geiger, INRIA.

### Organ database

Data base of human organs, represented by polygonal
slices. Good data for testing reconstruction algorithms.
More information is in this announcement.

By Gill Barequet, of Tel Aviv University.

The database is available by
ftp.

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*The Geometry Center Home Page*
Comments to: nina@geom.umn.edu

Created: May 31 1995 ---
Last modified: Thu Jun 1 14:30:22 1995