Isometric Projection Essay

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Isometric projection In isometric projection all vertical lines on an object remain vertical while horizontal lines are drawn at 30° to the horizontal. 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 from a plan view. Planometric drawing In planometric projection (also sometimes called axonometric projection) all vertical lines on an object remain vertical, while horizontal lines are drawn at 45°. Again it is usually done using drawing equipment. Planometric projections (like isometric drawings) show all dimensions accurately and to scale, and are frequently used to show buildings or room layouts. As they are drawn with 45° angles, planometric drawings show one plane of the object with no distortion at all, so that a circular object - say, a stool on the floor - can be shown as a true circle and drawn with a pair of compasses. Perspective drawing In perspective drawing the forward face or edge of the object is drawn first, with the other lines receding away from the viewer and gradually approaching each other - just as they appear to do when you look at a real object. If the receding lines are extended they will meet at points that are called vanishing points. Perspective drawing can be done using drawing equipment or freehand. Perspective drawing can use one, two or three vanishing points. One-point perspective is often used for room interiors. Two-point perspective has many applications for developing ideas in 3D. Three-point perspective is often used for drawings of tall buildings. The advantage of perspective drawing is
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