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5 From the Angle Precision drop-down list, choose the degree of precision you want when AutoCAD displays angular measurements.
6 In the Insertion Scale area, choose the units of measurement for this drawing.Choose your base unit for this drawing — that is, the real-world distance represented by one AutoCAD unit. I discuss the significance of this in ssss1. The AutoCAD (but not the AutoCAD LT) Drawing Units dialog box includes a Lighting area where you specify the unit type to be used to measure the intensity of photometric lights. I introduce lighting as part of rendering 3D models in ssss1.
7 Click OK to exit the dialog box and save your settings.
Making the drawing area snap-py (and grid-dy)
For the first three decades, AutoCAD’s grid consisted of a set of evenly spaced dots that served as a visual distance reference. You can still configure a dot grid, but starting with AutoCAD 2011, the default is a snazzy graph-paper–like grid made up of a network of lines.
AutoCAD’s snap feature creates a set of evenly spaced, invisible hot spots, which make the cursor move in nice, even increments as you specify points in the drawing. Both Grid mode and Snap mode are like the intersection points of the lines on a piece of grid paper, but the grid is simply a visual reference — it never prints — whereas Snap mode constrains the points that you can pick with the mouse. You can set grid and snap spacing to different values.