I've built multiple interactive semi-automated solutions for my own use (Flash based, JavaScript, SVG) which have a stop at the isometric angle between 35 and 36 degrees. That kind of "cheat" was arguably forgivable in the days of drafting machines, plastic templates, and Rapidiograph pens. One of the most common and most egregious error was committed when a beginning illustrator would forget and use ordinary 35° drafting ellipse templates with full measure along axes, resulting in dead-giveaway grossly disproportionate objects. That practice also was a rather inaccurate approximation a foreshortening of 75% was commonly used, when the proper scale would actually round to 82%. Inversely, "isometric projection" referred to using down-scaled (foreshortened) measure along the axes in order to use ordinary drafting ellipse templates. It's a rounding of a value which is similar to an approximation "cheat" which was commonly used in the pre-computer days of iso drawing "on the board," and which was considered rather sub-standard even back then, because dedicated isometric ellipse templates were commonly available.īack in those days, there was a distinction sometimes made between what was referred to as "isometric drawing" as opposed to "isometric projection." In a nutshell, "isometric drawing" referred to using enlarged ellipse templates (accurate templates labeled isometric) in order to use full-measure (not foreshortened) along the axes. So it's not an error, just approximation matter.
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