Lon presented some results of a Virtual Heritage projects to scan the
architecture of the Baths of Caracalla and the Colosseum. The work utilized
long range laser scanning to capture detailed model data of the structures.
Equipment and techniques varied based upon the resolution and purpose
of the scan. CNRC and Minolta systems were used for close range scanning
of objects. Longer range Cyra laser devices were employed to capture larger
sweeps of building architectures.
Lon wrote a paper a while back called "Virtualized Architectural
Heritage:New Tools and Techniques for Capturing Built History". This
was presented at the Virtual Systems and MultiMedia (VSMM98) conference
in 1998. It surveyed touch versus camera systems of the day. In general
there are touch, photogrammetric, and laser range-finding systems currently
employed in this type of data capture.
The LIDAR entry featured in SIGGRAPH 99's Computer Animation Festival
for the Cyra scanner was played to give participants a quick background
of its capabilities.
The Colosseum project was a massive multi-country, multi-discipline
project funded by the Bank of Rome. It employed multiple survey techniques
- all the way from classic paper/pencil/tape measure to LIDAR laser scanning.
The cross section that they scanned was done in a short amount of time
and thus was not the full structure. Future work may include the conversion
of the data clouds to surfaces.
The Baths of Caracalla used targets to synchronize the multiple scans
taken of the structures. It is common to take scans made of buildings like
these and run finite element analyses on them, especially helpful for strategizing
future repair strategies.
Lon ended the session by showing a recent scan of a San Francisco city
block done for Francis Ford Coppola, the film director.