tailieunhanh - MasteringAutoCAD 2011 and AutoCAD LT 2011 phần 8

Mặc dù bạn có sử dụng vòng tròn với lệnh Sweep để tạo ống, bạn có thể sử dụng bất kỳ hình dạng polyline khép kín. Hình 22,40 đưa ra một số ví dụ về các hình dạng khác, bạn có thể sử dụng với lệnh Sweep. | visualizing solids 833 Figure The Generate Sec-tion Elevation dialog box Click the button to expand the dialog box. Figure A copy of the solid minus the section area is created using the 3D Section option of the Generate Section Elevation dialog box. You can access more detailed settings for the 2D Section Elevation 3D Section and Live Section Settings options by clicking the Section Settings button at the bottom of the Generate Section Elevation dialog box. This button opens the Section Settings dialog box Figure which lists the settings for the section feature. 834 chapter 24 editing and visualizing 3d solids If you create a set of orthogonal views in a layout the work you do to find a section is also reflected in the layout views Figure . FIGURE The Section Settings dialog box FIGURE A set of orthogonal views in a layout visualizing solids 835 Taking Advantage of Stereolithography A discussion of solid modeling wouldn t be complete without mentioning stereolithography. This is one of the more interesting technological wonders that has appeared as a by-product of 3D computer modeling. Stereolithography is a process that generates physical reproductions of 3D computer solid models. Special equipment converts your AutoCAD-generated files into a physical model. This process offers the mechanical designer a method for rapidly prototyping designs directly from AutoCAD drawings though applications don t have to be limited to mechanical design. Architects can take advantage of this process too. My own interest in Tibetan art led me to create a 3D AutoCAD model of a type of statue called a Zola shown here. I sent this model to a service to have it reproduced in resin. AutoCAD supports stereolithography through the 3dprint and Stlout commands. These commands generate an STL file which can be used with a Stereolithograph Apparatus SLA to generate a model. You must first create a 3D solid model in AutoCAD. Then you can use the Export Data