orthographically
Using an orthographic projection (a way of showing three-dimensional objects in two-dimensional engineering drawings).
orthographically: drawing what you see, not what you feel
Orthographically means using parallel projection to represent a three-dimensional object on a flat drawing surface. Unlike perspective drawing, where lines converge toward a vanishing point, orthographic projection keeps parallel lines parallel, preserving true dimensions and angles. A machine part drawn orthographically shows length, width, and depth without optical distortion, making it the standard language of manufacturing and engineering.
The method works by projecting light rays perpendicular to the drawing plane. On a typical engineering drawing, you might see three orthographic views: front, top, and right side, each showing the object from a different angle at the same scale. A rectangular block appears as rectangles in all views, not as a trapezoid as it would in perspective. This consistency lets a machinist or fabricator read exact dimensions directly without mental reconstruction of depth.
Standards and practice
Orthographic drawing follows strict conventions set by ANSI (American National Standards Institute) or ISO (International Organization for Standardization). The placement of views, the direction of projection, and the spacing between views are all standardized so that a drawing made in one country can be manufactured in another without ambiguity. Dimensions are placed on the views themselves, and hidden features appear as dashed lines to maintain clarity.
Orthographic views solve a real problem: a two-dimensional drawing must convey enough information for someone to build the part accurately. A perspective sketch looks realistic but cannot serve as a manufacturing instruction because an observer cannot trust the apparent angles or proportions. By contrast, orthographic views sacrifice visual appeal for precision. The front view shows true width and height; the top view shows true width and depth; the side view shows true depth and height. Together, these views are unambiguous.
CAD software generates orthographic views automatically from a 3D model, but understanding the principle remains essential for interpreting legacy drawings and catching errors. A missing dimension, an unclear hidden line, or a misaligned view can stop production. The term itself comes from Greek: ortho (straight or correct) and graphia (drawing), reflecting the method's reliance on right angles and parallel projection rather than optical illusion.