|The majority of the problems that CAAD deals with are located in
contemporary buildings. But many other buildings of the historical heritage
also need special attentions with their computer design prior to the
restoration projects. Generally, in restoration work, hand drawing and
artistic criteria have been more usual than work with precision topographic
data and accurate technical plans.
But a very rigorous design is not always enough to start restoration work.
The real state that presents a historical building could have been modified
substantially from its original state due to previous interventions, wars,
seismic movements, erosion, biological aggressions or any other
So, it is necessary to join CAAD tasks with a simulation of the historical
process suffered by the building. Historical data and ancient cartography
must be the basis of all the CAAD works, and the quality of the computer
3D model can be established comparing it with the original available
This paper explains the CAAD works and the intervention proposals for
the restoration of the City Walls of Hondarribia, a small Spanish village
placed in the frontier between Spain and France. These Renaissance
bastioned walls were partially destroyed throughout many wars with
France. The exact knowledge of their original trace and dimensions only is
possible comparing the real CAD models with the plans that exist in the
Spanish Military Archives since the XVIth. century.
The digital store and index of all the historical information, their
comparison with real photographs of the city walls, the creation of photo
realistic images with the intervention proposals, and the influence of the
structural repairs in the final project will be explained in the CAAD context.