One simple reason for this, among many others, is CAD’s ease of use. While some engineers still hold fast to 2D drawings for at least some applications, most have fully embraced CAD software and have never looked back. And from the other side of the table, looking down at a set of 2D blueprints and mentally turning them into a 3D object in your imagination is no easy feat. Yet even with years of experience and heaps of time to spare, it’s extremely difficult to accurately represent 3D, real-world objects on paper in 2D. These drawings would depict the precise dimensions of each aspect of their machine or other creation from multiple angles. Until CAD (computer aided design) software showed up on the stage a few decades ago, engineers, architects, and other kinds of professional designers would sketch their product and manufacturing designs out on paper, usually with pencils.
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