| A | B |
|---|
| Isometric Sketch | A sketch in which an object’s parallel edges are drawn with parallel lines, typically at 30 degree angles to the horizontal baseline. There are no vanishing points and three sides of the object can be seen simultaneously |
| Multiview Sketch | A sketch typically including three primary views of an object that are sketched using orthographic projections. The top, front, and right primary views of the object are projected onto a drawing plane perpendicular to each view. An isometric sketch of the object is often included |
| Orthographic Projection | A method of representing views of a three-dimensional object by projecting the visible faces in each view on a two-dimensional plane |
| Perpective Sketch | A type of pictorial drawing in which vanishing points are used to provide the depth and distortion that is seen with the human eye. |
| One-Point Perspective | A method of realistic drawing in which the part of an object closest to the viewer is a planar face, and all the lines describing sides perpendicular to that face can be extended back to converge at one point, the vanishing point |
| Two-Point Perspective | A realistic way of drawing objects in three dimensions using a horizon line, a key edge, and two vanishing points |
| Thumbnail Sketch | A preliminary visual of a possible idea for a design. Most thumbnail sketches are not full-size and have little detail. Their purpose is to help quickly explore possible alternative designs |
| Construction Lines | lightly drawn lines that you can use to help you draw other lines properly. You can erase these lines after you sketch an object. |
| Object Lines | thick lines used to show visible edges of an object. Sometimes construction lines are converted to these lines |
| Hidden Lines | used to show interior (inside) details not visible from a particular view of an object |
| Center Lines | used to show the center of arcs, circles, or symmetrical parts of an object. |
