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3d Geometry Building
3D Geometry building has concentrated on generating geometry in the 2D flat plane. The "2D style" method of geometry modeling can be used for 3D surface model creation as well. The construction of 3D geometrical object was also difficult especially when the participants were operating the 3D rotation mentally and physically with respect to their body. It was found that the simultaneously use of different frames of reference could help the construction of 3D geometrical objects.
Building information modeling developing and managing objects introduces new challenges for design firms because of the need to represent 3D geometry and encode other kinds of information. The cost and resources needed to develop objects can detract from designing and delivering buildings, which is the core focus of an architectural firm.
Techniques for Generalizing Building Geometry of Complex Virtual 3D City Models -
- Comprehensible and effective visualization of complex virtual 3D city models requires an abstraction of city model components to provide different degrees of generalization. In a preprocessing step, individual building models are clustered into cells defined by and derived from its surrounding infrastructure network such as streets and rivers.
- The first technique uses cell generalization; from a given cell it extrudes a 3D block, whose height is calculated as the weighted average of the contained buildings; as optimization, outliers can be managed separately. The second technique is based on convex-hull generalization, which approximates the contained buildings by creating the convex hull for the building ensemble. The third technique relies on oxidization, which converts the buildings’ geometry into a regular 3D raster data representation.
- AD simulates building components within a CAD-based environment, focusing on the 3D geometry of the building, the generation of 2D documentation from that 3D geometry, and the extraction of object data from the building components to provide information about quantities and object properties.
