Copyright Goodheart-Willcox Co., Inc. 336 AutoCAD and Its Applications—Advanced To create dimensions that properly display, it may be necessary to modify the dimension text rotation. The dimension shown in Figure 13-9A is inverted because the positive X and Y axes are incorrectly oriented. Using the Properties palette, change the text rotation value to 180. The dimension text is then properly displayed, Figure 13-9B. Alternately, you can rotate the UCS before drawing the dimension, but this may be more time-consuming. PROFESSIONAL TIP PROFESSIONAL TIP Prior to placing dimensions on a 3D drawing, you should determine the purpose of the drawing. For what will it be used? Just as dimensioning a drawing for manufac- turing purposes is based on the function of the part, 3D dimensioning is based on the function of the drawing. This determines whether you use chain, datum, arrowless, architectural, or some other style of dimensioning. It also determines how completely the object is dimensioned. A B Figure 13-8. A—An example of a 3D object dimensioned using the aligned technique. B—The object dimensioned with unilateral dimensions. A B Figure 13-9. A—This dimension text is inverted. B—The rotation value of the text is changed and the text reads correctly.