The complexity of piping configurations requires a more descriptive “point of reference” be used to establish orientation between the orthographic and isometric views. Although the A can be seen in Figures 13.3 and 13.4, it is not an adequate point of reference. Similarly, on piping isometrics, establishing a point of reference is imperative. By using a point of reference, proper orientation of the isometric can occur by transferring distance and direction from the orthographic view. Note in Figures 13.1 and 13.2 how the height, width, and depth dimensions of the L-shaped object in the orthographic views are oriented on the isometric view with A as a point of reference.
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