2. Department of Building Services Engineering, Technical University of Cluj Napoca, Cluj Napoca, Romania

Abstract: With the advent of the computer are dramatically influenced, both the shape and materialization of architecture, and of course the representation in architectural design. New trends, theories and styles appear in the architecture produced by digital. A new language of architectural forms, the so-called free forms, makes its presence felt in the built environment. The relationship between the shape of these free volumes and simple geometric volumes represents an evolution whose result is the change of the architectural paradigm towards a digital architecture. At the base of this new architecture is geometry, with its primary volumes. In this paper we want an inventory of buildings that use irregular and regular polyhedra as geometry. These polyhedral volumes allow modularity and repetitiveness, and this process can be extended to give rise to more complex forms such as free forms. Descriptive geometry must provide basic knowledge about the creation of space, shapes and methods by which they can be represented.