BIM课程-02-计算机建模.pptVIP

页眉 * The size of the model can be just as critical as the complexity of the building. Most of the time very large models are the result of inappropriate modeling techniques. Typical example of this problem is when very detailed furniture or sanitary objects are??? 页眉 * Finding the best modeling approach requires full understanding of the application’s capabilities and clear definitions of the modeling goals. Although the features of the programs can largely influence the best modeling strategy there are a few general rul??? 页眉 * As a general advice we can say that if you work with large projects you should buy the best hardware that you can afford. There are four components of the computer hardware that are critical; the processor, the physical memory, the hard disk and the graphi??? 页眉 * According to the classic BIM workflow the 3D modeling, the complete documentation and the visualization work is done in the BIM application. This approach can be very effective in case of small to medium scale projects. 页眉 * For large or complicated buildings a more complex solution is required that usually means the combination of special purpose modeling software with the core BIM application. The figure shows a project where the early design phase mass model was developed i??? 页眉 * Over the course of time many computer modeling techniques were developed. Without going into technical details let’s have an overview of the most important ones. Polygonal modeling is the most widely used technique in CAD programs and computer games. The ??? 页眉 * The NURBS technology solves the problem of curved shapes as it is using mathematical models to describe them. On the other the implementation of NURBS in a program requires extensive programming. For this reason NURBS are primarily used in freeform modeler??? 页眉 * Constructive solid geometry can be very effective if a complex object can be derived from Boolean operations made between two simple shapes. The basic Boolean operations are: