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Drawings giving detailed information about structure, dimensions, materials, and assembly instructions for a graphic product are done using one of a number of formal techniques. The main ones are isometric projection, planometric projection, perspective drawing, and - for working drawings - orthographic projection, section drawings and assembly drawings.
Because these formal drawings need to last and be used by others, you need to think about the preservation and presentation of your work.
Isometric projection
In isometric projection [projection: a representation of a three-dimensional solid on a two-dimensional surface ] all vertical lines on an object remain vertical [vertical: at right-angles to the horizon; straight up-and-down ] while horizontal lines are drawn at 30° to the horizontal [horizontal: parallel to the horizon; left-to-right and flat ]. Isometric drawings are usually produced with drawing equipment to ensure accuracy.
Isometric projection distorts shapes slightly in order to keep all upright lines vertical (and because perspective is ignored). Their advantage is that they show the object's dimensions accurately and in correct proportion to each other, making it easy to draw the projection correctly to scale [to scale: having a fixed relationship to the actual dimensions of an object. The relationship is usually stated as a ratio, eg 25:1. ] from a plan [plan: scale drawing showing an object as seen in a cutaway view from directly above ] view.
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