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Engineering Drawing Principles
Published in Keith L. Richards, The Engineering Design Primer, 2020
A dimetric projection is an axonometric projection of an object where two of its axes make equal angles with the plane of projection and the third axis makes either a smaller or a greater angle (Figure 2.16). The two axes making equal angles with the plane of projection are foreshortened equally, while the third axis is foreshortened in a different proportion.
Methods of Spatial Visualisation
Published in Ken Morling, Stéphane Danjou, Geometric and Engineering Drawing, 2022
An axonometric projection is a projection method where a pictorial view is created by rotating the object on one of its axes, relative to the projection plane. In this way all three dimensions can be shown. However, not all of them are shown in true size (Figure 4.15).
The role of a graphical interpretation factor in the assessment of Spatial Visualization: A critical analysis
Published in Spatial Cognition & Computation, 2023
Kristin A. Bartlett, Jorge Dorribo Camba
Understanding the gap between the 2D stimuli and its 3D interpretation is a challenge that involves many procedures and biases. One of these procedures is known as the principle of “genericity” or “non-accidentalness,” which is particularly relevant in computer vision research for understanding the perception of line drawings (Biederman, 1987; Hoffman & Richards, 1984). The principle of genericity states that we interpret what we see assuming that the scene is not viewed from an “unstable” viewing position, i.e. viewing position which, if perturbed slightly, would lead to a change in the topology or structure of the image (Albert & Hoffman, 1995). An example of an unstable or “non-generic” viewing position is the isometric projection of a cube (Figure 2). This non-generic view where the line of sight matches one of the diagonals of the cube causes two opposite vertices to align precisely, which results in a regular hexagonal contour that can be interpreted in a variety of ways. Likewise, a cube in an axonometric projection can either be perceived as a 3D cube with volume, or as 3 planes that each share 2 edges with the others and converge at a single point, with no volume, as in this common optical illusion (Figure 3) because the viewer cannot use the visual clue of converging lines that is present in perspective drawing.