AutoCAD Platform Customization. Ambrosius Lee

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      User Coordinate Systems (UCSs) All drawings contain a world coordinate system (WCS), which works well when you are drawing from a plan view. A user coordinate system (UCS) allows you to change the orientation of the working plane (X,Y) in addition to the Z-axis or placement of a drawing's origin. If you are drawing objects that are very far from the origin (0,0) of a drawing in 2D, adding ordinate dimensions, or using pattern fills, you might want to define a new origin to make entering coordinate values or controlling the pattern placement for a hatch object easier. UCSs are much more commonly associated with 3D modeling, though, because they allow you to align the UCS with the face of an object or change the direction of the Z-axis and the current working plane so that you can draw 2D objects at different angles in 3D space and then extrude them. The ucs and ucsman commands are used to create and manage named UCSs.

      Model Space Viewports You can divide model space (using the Model tab) into more than one viewport and then save it as a viewport configuration. This approach is useful if you are working on a 3D model because it allows you to start a command in one viewport and switch to another viewport that has a different view to finish the command. It can be helpful when you are working on large drawings as well. You use the vports command to create named viewport configurations or restore the original single-viewport configuration.

      Visual Styles Looking at 3D models in wireframe can make it hard to tell what is going on at times, and rendering your model can take some time based on the lighting, materials, and other rendering settings that are applied. Visual styles allow you to control a number of settings that affect the appearance of 3D objects. They can be used to show only the visible edges from the current viewpoint, apply colors of shading, and even make 3D objects appear semitransparent to see the objects beyond. Visual styles can be created and modified in AutoCAD on both Windows and Mac OS, but the process is slightly different. In AutoCAD on Windows, you use the visualstyle command to display the Visual Styles Manager, but in AutoCAD for Mac you use a combination of the Visual Style section on the Properties Inspector (properties command) when no objects are selected and the vssave command to save the changes to a visual style.