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mjhorvath avatar mjhorvath commented on June 16, 2024

Hi Crissov. Could you direct me toward some literature about Engineering Projection? I'm not familiar with it. Thanks.

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Crissov avatar Crissov commented on June 16, 2024

For dimetric axonometric drawings in engineering, ISO 5456-3, section 5.2, specifies a projection with skewing from the horizon by 42° and 7° and scaling of the former (i.e. depth) axis by ½. The standard does not say so, but these angles are apparently rounded from arcsin(⅛) and arccos(¾), respectively, which are sometimes (e. g. in the German DIN adoption of the standard) given more precisely as 7°10′ and 41°25′, respectively.

DIN ISO 5456-3 (1998) Bild 7 dimetrisch
DIN ISO 5456-3 (1998) Bild 8 dimetrisch


Wikipedia: Axonometry with 90° + 42 ° = 132° and 90° + 7° = 97°, i. e. angles measured from the vertical / height / z axis instead of the horizon.

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mjhorvath avatar mjhorvath commented on June 16, 2024

Okay, it will take me a while. Usually I start with camera orientations and work my way from there. In this case I will be doing the reverse.

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