3D Modelling of Construction Objects Based on the Integrated AutoCAD System

Abstract

Wide implementation of computer modeling of three-dimensional construction objects allows us to solve many technical, logistical and design problems. The development of a detailed electronic three-dimensional plan is a valuable virtual base that allows you to create, display and use for engineering purposes models of various types of engineering, telecommunications and computer networks, plan their construction, modernization and replacement. Connecting external databases to the electronic model allows you get a full specification of buildings, networks and any other objects, display a time record of repairs, replacements, etc. in addition, the 3D model allows you to enter the color differentiation of objects, which can give additional information, for example, the allocation of dangerous equipment (fire, explosive, etc.) in red or other color on the three-dimensional plan of the building. AutoCAD was selected to build a 3D model of the branched multi-storey building of one of the buildings of a modern University, which allows you to get accurate 3D models, has the means of obtaining sections and sections, and also provides a fairly realistic visualization. To obtain a 3D model of the University buildings, all the work was divided into the following stages: building two-dimensional electronic plans of each floor; building three-dimensional models of each floor; combining floor models into a common 3D model of the building. Models of buildings were created on separate layers, which makes it easy to turn off a particular layer, and to study the internal structure of buildings. The 3D model has real dimensions and is easily scaled. Engineering networks and other equipment items can be attached to the model elements in the future, and other tasks will also be solved, such as the location of fire-fighting equipment, escape routes, emergency exits, etc. When creating 3D models, we used the color differentiation of objects. We describe a mechanism for programmatically selecting objects by color in the AutoCAD environment, as well as a program that implements this selection mechanism using a data file with sequential access as an external database.