The two-dimensional graphical interface estimation system is entirely intuitive—what you see is what you get. It extracts graphics related to estimation, using two-dimensional graphical objects to represent the estimation operation mode through spatially correlated graphic logic. This also clarifies the definition and scope of each component. The two-dimensional estimation diagram includes columns, beams, plates, walls, stairs, footings, and decoration spaces. Each component is a complete object formed by continuous lines, providing a basis for calculating area or length.
However, simulating the operation logic and object transformations of three-dimensional space on a computer remains a challenging task. In this article, the author discusses the importance of exploring BIM applications starting from a two-dimensional estimation approach.
The two-dimensional architectural decoration estimation process begins with reading the drawings and obtaining a complete set of architectural plans, including both architectural and structural drawings. Estimation software is then used to extract and convert AutoCAD drawing information. The data is output as a detailed engineering decoration table through computer estimation software, though its database system remains independent. If any changes or corrections occur in the drawings, the AutoCAD information must be re-extracted and converted.
Traditional estimation relies on the dimensions and numbers present in AutoCAD drawings, which are interpreted visually and processed through human judgment. The conversion of numerical and textual information into a format accessible to computer programs marks a significant step forward in building estimation accuracy. The information needed includes dimensions and codes of various building structures, as well as data for calculating decoration space quantities—such as floor, ceiling, wall perimeter, skirting perimeter, floor openings, ceiling lintels, edge beams, wall openings (doors, windows), top beams of wall edges, ceiling height, and paint material definitions.
As illustrated, traditional estimation not only requires analysis of drawing component dimensions but also the organization of numerous spatial conditions to achieve accurate calculations. This complex process has become a major reason why traditional estimation speeds have not improved significantly.
In the 21st century, advancements in computer graphics interfaces and object-oriented, automated operation modes have transformed estimation methods. Since 2010, the adoption of complete graphic interfaces and object-oriented programming, along with the widespread use of BIM technology, has significantly elevated estimation practices.
BIM directly extracts drawing information from building object usage modes and converts it into 3D components. Compared to the cumbersome 2D editing mode—which cannot directly obtain or export information from AutoCAD DWG files—the 3D object-oriented estimation approach offers higher efficiency, smoother quantity calculations, simpler functionality, and leverages fully vector-based spatial mathematics.
By utilizing 3D object-oriented programming concepts and technologies, building estimation tools now feature enhanced editing, spatial mapping, and computational capabilities, aiding engineers in managing complex designs and estimations. In conclusion, it is clear that exploring BIM applications from a two-dimensional estimation standpoint is essential. The author encourages everyone seeking to improve work efficiency and reduce errors to embrace BIM technology.
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