There are many ways to create an object. As indicated elsewhere in this documentation, an object need not be something you can touch and feel (i.e. some built-matter) In TAD, one is able to work with spaces too. In fact, one can even insert pseudo-objects or objects that have no architectural meaning but are mere place holders (e.g. the viewpoint from where to look at the 3D scene, light locations, etc)
Objects may be 2D or 3D.
However; one always first creates a shape in plan on some reference plane (often the ground itself) and then extrude that shape later to get the 3D volume you want. In TAD 2D and 3D shapes co-exist. Of course, when you invoke the 3D Draft view command, only the 3D volumes would be visible.
IMPORTANT difference between TAD and CAD
In CAD softwares; an architect would lovingly create the shape in the manner the architect wants; as he inserts that shape into the CAD environment. TAD does not work like that. TAD wants you to first create some shape or the other so that you can quickly get to other aspects of your design. You can lovingly edit all shapes later on; to get it to be the way you wanted in your mind. This is a paradigm shift. TAD, initially seems more non-visual and conceptual. We believes it frees your mind and asks your mind to think about other logic of your design; other than the visual.
The Create menu will bring up a tabbed dialog; from where you can create the starting shapes for the objects in many different ways. Once you become an expert; you can also use the Headsup Command Line to directly create shapes.
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