| Term | Definition |
|---|
| Third Angle Projection | top view projected to the horizontal plane, front view projected to the frontal plane and rt side is projected to the profile plane; universal method in US and CAN |
| Elevations | Orthographic views that are projected to verticle planes (front, rt side, and rear) |
| Plans | Views that are projected to horizontal planes (top, bottom) |
| Elevations | Orthographic views that are projected in verticle planes (front, side and rear) |
| Plans | Views that are projected to horizontal planes and observed from the top |
| Floor Plan | Horizontal section view of bldg as seen from above |
| Section | Imaginary cut made thru an object w the mat in front of the cut removed |
| Cutting Plane Line | Imaginary cut on the related drawing |
| Orthographic | writing or drawing 90 degrees to the picture plane |
| Advantage of perspective projection | spatially inuitive, does not require interpretaion |
| Disadvantage of perspective projection | not dimensionally stable, you cant trust size info |
| Advantages of orthographic projection | more dimensionally stable, size info is more reliable |
| Disadvantage of orthographic projection | not spatially intuitive, requires interpretaions |
| Orthographic projections require what? | INTERPRETATION |
| Edge View | Plane surface is perpendicular to plane of projection |
| True Size | Plane surface is paralell to plane of projection |
| Foreshortened | Plane surface is situated at an angle to plane of projection |
| Edge | perpendicular to a plane of projection |
| Corner | POINT common intersection of 3 or more surfaces of edges |
| normal frontal | parallel to the frontal projection plane |
| normal profile | parallel to the profile projection plane. (simplest type) |
| normal horizontal | parallel to the horizontal projection plane. |
| ortho frontal | perpendicular to the profile projection plane. |
| ortho profile | perpendicular to the profile projection plane |
| ortho horizontal | perpendicular to the horizontal projection plane. |
| Normal surfaces | all of the true size information pertaining to a normal surface can be found by consulting a SINGLE orthographic view. |
| orthographic surfaces | You must consult at least two orthographic views in order to find all of the true size information about a simple INCLINED plane. |
| Complex or oblique surfaces | You must consult at least 3 or more orthographic views in orde rto fine al of the true size information about a complex INCLINED plane. |
| principles of projection | inclined surfaces are not parallel to the upper horizontal plane therefore they do not appear in their true shape. The ridges of the roof are parallel to the picture plane and appear as full length or true size. |
| orthographic theory | Said to be the clearest method for showing true shapes, the relationship of features, and dimensions of an object. (ortho means perpendicular) |
| planes of projection | When the front, top, and side views have been projected onto the frontal, horizontal, profile planes. |
| adjacent views | vertical- front, top, and bottom (equal width). Horizontal-rear, left, front, and right.(equal height) |
| Nonadjacent views | top, bottom, right and left side views |
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