tailieunhanh - Modelling with AutoCAD 2002 Episode 4

Tham khảo tài liệu 'modelling with autocad 2002 episode 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 11 Model space and paper space and untiled viewports AutoCAD 2002 has multi-view capabilities which allow the user to layout organise and plot multiple views of any 3D model. The multiple viewport concept has already been used with our wire-frame models these viewports being TILED . fixed. In this chapter we will investigate how to create UNTILED or FLOATING viewports which are used in the same way that the tiled viewports were used. The creation of untiled viewports requires an understanding of the two AutoCAD drawing environments - model space and paper space. The model paper space concepts required by the user are 1 Model space This is the drawing environment that exists in any viewport and is the default. All models which have been created have been completed in model space. Model space is used for all draughting and design work and for setting 3D viewpoints. Multiple viewports are possible in model space but are TILED . they cannot be moved or altered in size - Fig. a . While model space multi-views are useful they have one major disadvantage -only the active viewport can be plotted . model space multiple viewports cannot be plotted on one sheet of paper. 2 Paper space This is a drawing environment which is independent of model space. In paper space the user creates the drawing sheet . border title box etc. as well as arranging the multiple viewport layout. The viewports created in paper space are UNTILED . they can be positioned to suit altered in size and additional viewports can be added to the layout -Fig. b . In paper space the 3D viewpoint command is not valid although objects particularly text can be added to the sheet layout. The real advantage of working with paper space multiple viewports is that any viewport configuration can be plotted on the one sheet of paper. 3 Tilemode The system variable which controls the type of viewport to be created is TILEMODE and a TILEMODE 1 model space FIXED viewports and paper space .