critical analysis of the absence of interior - Bilkent University

out the plan view of the object into a specified height. Nowadays, ‘extrude’ is the
most common ‘topological transformation’ used in most of the CAAD software.
Moreover, ‘sweep’ is a method that creates a geometrically complex 3D object
through pushing a 2D object through space while revolving it around an axis at the
same time (3D Animation Glossary, 2008). As a last ‘topological transformation’,
‘loft’ denotes creating a 3D surface by copying a 2D section through an axis
(Wikipedia, 2008). This method is mostly applied by 3D modeling software
packages.
‘Boolean operations’ are the basic operations in any CAAD software. ‘Boolean
operations’ include ‘add’, ‘subtract’ and ‘intersect’ operations (Szalapaj, 2001). The
‘add’ operation unifies two or more objects while creating an object based on the
total geometry of all. The ‘subtract’ operation, as the name implies, subtracts the
selected object from another by creating an object from the remaining geometry. The
‘intersect’ operation creates an object from the overlapping geometry
(MYCADSITE, 2008)
The last operation Szalapaj (2001) defined is ‘logical operations’ that includes
‘grouping’, ‘typing’ and ‘layering’ operations. Initially, ‘grouping’ operation
provides grouping of 2D or 3D objects as if they react like one object. Then, ‘typing’
operation is a process of grouping objects with similar characteristics to describe a
drawing in terms of its parts such as walls, windows, etc. As indicated by Szalapaj
(2001), ‘types’ in CAAD systems are associated with non-graphical information such
as area, cost, value, etc. that allow users to control the drawing information for other
purposes. Moreover, ‘types’ are the focus points in object oriented programming
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