# Rialto 3D Modelling: Blogpost 3

Last three weeks have been crucial in the developing of our project about the modelling of the three different scenarios of the Rialto Bridge in Venice. Finally, our researches on the literature have been successfully brought off. In particular, what we’ve focused on since the very beginning was to collect an adequate of elements to be used in the modelling of the bridge in the 3D CAD environment. Since the layout of the Rialto is very complex, including a wide amount of details and architectonical particulars, our intention has been to define, when possible, the main elements of the layout and find in the literature the quotes and dimensions to represent it.

According to this, the very first step involved the sketching of the rough layout of the Rialto (as shown in the figure hereunder), finding on the book “Rialto: le fabbriche e il ponte” by Donatella Calabi and Paolo Morachiello, the main dimensions of the three different version of the bridge we want to represent by means of a 3D modelling.

The main issues we’ve faced have been about finding exact measures about every architectural element of the Rialto. For example, in the project developed by Andrea Palladio the only reliable dimensions we found on the literature are about the total length of the bridge and about its height. Of course, by means of just three measures, it is very hard to define the whole geometry and implement it in the CAD software. This particular task has revealed very challenging throughout the last weeks but, at the same time, we’ve managed to handle this issue by consulting both the Internet (finding all kind of references and information related to our project) and another book, i.e. I quattro libri dell’archittettura written by Andrea Palladio. What we’ve found very useful has been the specification of the ratio between the main dimensions of the bridge. Iterating this approach for all three different versions of the Rialto we’ve been able to derive all the exact quotes of the layout. Another important element to underline is that our researches have been focused on the main architectural elements of the layout, i.e. the subdivision of the total length in equal parts, the number of support pillars in the bridge, the radius of the different arches (the central one and the ones on the side) and the ratio between them, diameter and length of the columns, etc.

Once we’ve carried out this preliminary study, after few training sessions on the software suite Google Sketch Up Make, we started modelling the Rialto in a 3D environment.

The figure above shows what we’ve come up with so far, i.e. the modelling of the Rialto Bridge developed by Scamozzi. As shown in the figure, the main elements of the geometry have been defined by means of exact dimensions and the overall layout has just to be adjusted implemented further details.

Our commitment during the next weeks is to apply the same methodology to the remaining two scenarios: starting from the dimension already derived we just have to model the layout by means of the software.

Marco Liborio Biancolillo. Omar Flores