ENGINEER 1C03 Study Guide - Final Guide: Oblique Projection, Projection Plane, Angle

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Planar projections: subclasses are based on the orientation of the object with respect to the projection plane. Orthographic projection most commonly used for engineering; differs from oblique projection in that the parallel projectors are perpendicular (normal) to the projection plane; Isometric lines: lines parallel to a principal axis. Nonisometric lines: not parallel to any of the three principal axes. An objects longest principal dimension should appear as a horizontal dimension on the front face of the object. Third angle projection: used in the us, great britain, assumes that an object to be projected resides in the third quadrant; the projection planes are between the viewer and the object ; glass box opens towards you. First angle projection: used in the rest of europe and asia, the object to be projected is placed in the first quadrant; the projection plane are all placed behind or below the object.