Why CAD?
Because CAD let’s you do so much more with a drawing than just look at an image on some paper. An electronic drawing can be adjusted as many times as you need, without having to start again each time. It can be printed or copied inexpensively and it can be transmitted directly by e-mail. If you want, the drawing can be done in a ‘solid-modelling’ programme and then you can generate photo-realistic rendered images of your idea, you can view them from any position, and you can also calculate some of the physical properties of the object, such as its surface area, its weight, centre of gravity and even map stress lines in it. And after all that, you can change the drawing a little and render or calculate it all over again.
