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I am trying to get an orthographic render out of Blender with precise accuracy. The scale that I would like is 1"=1'. To prepare my scene, I have changed units to Imperial with separate values. I then changed the output dimensions to 7200x5400 - so that I can get an 24"x18" output at 300ppi. My problem now is setting the orthographic scale. I have tried 12 (for 12 inches in a foot), but the resulting render is too small. After fiddling with the scale manually, I figure that I'd need something less than 7.4, but I don't know how to get a precise scale for my use case.

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    $\begingroup$ blender.stackexchange.com/questions/64914/… $\endgroup$ – Duarte Farrajota Ramos♦ Mar 19 '20 at 17:42
  • $\begingroup$ Hi :). I made it work with scene units set to inches. The orthographic scale is then 0,6096. But it took me another hour to figure out why. Turns out 24 inches=609,6mm. $\endgroup$ – Jachym Michal Mar 20 '20 at 0:04
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    $\begingroup$ I'm voting to reopen this so Qwerty can post his solution as a full answer. Not everyone has @Duarte's big brain :). $\endgroup$ – Jachym Michal Mar 20 '20 at 0:08
  • $\begingroup$ reopened @qwerty you should post your edit as an actual answer below. $\endgroup$ – Duarte Farrajota Ramos♦ Mar 20 '20 at 1:02
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Unfortunately the answer by Duarte Farrajota Ramos does not address the orthographic scaling in imperial units. However, after pulling my hair out for a few hours, I finally understood that the Blender cameras do not respect the scene units (is this a bug?). So what I did was to set the orthographic scaling to 0.9144 so that it would match a yard (it seems that a yard is a better target than a foot) and then adjust the unit scaling in the scene properties, and voila, it works!

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