Evidently, developments in one domain inevitably influence various different research fields and encourage the genesis of new questions related to the correctness with which we distinguish, describe and finally model the world. This profound need has led us to the description of our physical animate and inanimate surroundings in a higher dimensionality, both in theoretical and technological fields. Therefore, the constant need of the modern world to better comprehend and enhance the perception of the real world’s entities and phenomena through technological advancements has become clear. Furthermore, spatial relations and constraints between real world objects of this multidimensional build environment need to be translated and to be modeled adequately within a geometric and a topological concept and have to be incorporated within a semantics basis. This 3D representation of the composite urban cityscape or the mixture of information in land management systems is a rather laborious and a challenging task and generally constitutes a rather expensive and time-consuming process, both for the modeling approach as well as the effectiveness concerning the generation of suitable texture facades of edifices. This range of land rights, restrictions and responsibilities requires proper 3D registrations complying with each legal structure, as well as systematic encoding and modeling, fully exploiting technical capabilities of 3D representations (Dimopoulou & Elia, 2012). The detailed geometries of the model derived from the application of CGA (Computer Generated Architecture) shape grammars on selected footprints, and the process resulted in a final 3D model, optimally describing the built environment and proved to be a good practice example of 3D visualization.Ĭontemporary urban environment is distinguished by its structural complexity and the multiple use of space in which a range of different RRRs (Rights, Restrictions and Responsibilities) intersect with the corresponding land parcels. This algorithmic modeling concept is based on the principle that all real world buildings are defined by rules, since repetitive patterns and hierarchical components describe their geometry. In this paper procedural modeling is employed via CityEngine software focusing on the 3D visualization of the National Technical University of Athens (NTUA) campus' three-dimensional model, rendering a higher detail on the School of Rural and Surveying Engineering (SRSE). Procedural modeling refers to a variety of techniques for the algorithmic generation of detailed 3D models and composite facade textures from sets of rules which are called grammars. Within this context, GIS community's present demands concerning the third dimension are discussed, while a variety of 3D modeling techniques is presented, with special emphasis on procedural modeling. Besides, current technological advances as well as the availability of sophisticated software packages (proprietary or open source) call for 3D modeling especially in the GIS domain. Abstract3D space registration and visualization has become an imperative need in order to optimally reflect all complex cases of rapid urbanization of property rights and restrictions.
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