Starting with a sketch, the geometric parameters are then added (e.g. The generation of a parametric object can be illustrated very well by a Revit family element (flange).Ĭreation of a parametric object in Autodesk Revit In contrast to direct modeling, the creation of parametric elements requires good 3D modeling knowledge and requires some experience and practice. A change of the main elements results in a change of the sub elements. Windows are related to walls, railings are related to stairs and fittings are related to pipes. The control of the objects is thus exclusively done via parameters. material, dimension, color) and dependencies among each other in addition to the parameters of pure geometry. In parametric modeling, the objects are defined with attributes (e.g. In practice, this type of modeling is very popular for complex objects or interfering edge models and is often used because "as-built" modeling can be done very quickly and easily. by scaling, stretching, rotating, etc.) the objects are acquired realistically and without dependencies to each other. The objects are represented by edge, surface and solid models. This modelling type focuses on pure geometry. The most economical results are achieved by the clever combination of both types of modeling. In practice, there is usually no "either-or" principle. While only a few years ago only pure geometry (classic and/or direct modeling) could be modeled, today it is possible to assign and define parameters and dependencies (parametric modeling). The question of which type of modeling should be used plays a major role in project management. Starting with the elements "construction" the pumping station was refined step by step and filled with technical information.Įlements "Construction", complete model section The modeling was done according to the principle of "big into small".
PARAMETRIC 3D MODELING DEFINITION SOFTWARE
The georeferenced point clouds were then parametrically modeled with the software Autodesk Revit. The scan data was captured and registered with a terrestrial laser scanner. View: Point cloud (small image) and model (large image) of the pumping station Further considerations will focus on the elements of the sewage technology. The 3D model is to be used subsequently for reconstruction planning. The pumping station consists of three structural levels with different sewage engineering systems, electrical engineering, plumbing and ventilation/air conditioning technology. The scan data of a pumping station were processed to a complex and very detailed as-built model. The further development of 3D models with their advantages and disadvantages as well as various questions regarding modeling are explained, analyzed and considered in this project. Our current case study is from the field of wastewater technology. The information in the models is becoming more and more versatile and detailed and increasingly requires expert knowledge and modelling tricks and skills from the modellers. technical building equipment, wastewater facilities, underground supply channels, etc. In the meantime, we are receiving more and more requests for the creation of user-specific data, e.g. So far, the focus has been mainly on building geometry. Many of our customers have identified the advantages of 3D modeling in recent years and actively use these models in further data processing.