I went through this with a couple of student requests last semester. The following is the way I finally ended up “faking it”:
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Decide on a common base point for the following operations - preferably one that lies on the front face of the object.
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From the Top view, scale 1D along the Y axis using the basepoint above as origin and a factor of “1 divided by the square root of 3” (~0.57735) This is necessary if you want the drawing to have true dimensions along the diagonal. For a more realistic effect, a smaller scale factor might be appropriate, the classic “cabinet oblique” style drawing used half the real dimension on the diagonal, so half of the scale factor above.
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From the Right view, Shear the model +45 deg. (CW) using the basepoint as origin and a horizontal line as the axis.
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From the Top view again, Shear the model -45 deg. (CCW) using the basepoint as origin and a vertical (Y axis) line as the axis.
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Voilà! Now do a Make2D with the Front view…
Obviously the 3D model is completely useless after this operation, so either do this on a copy or Undo back to where you started… I can create a quick vid tutorial if you need later.
Edit - it occurs to me that one might be able to set this up as a series of components in Grasshopper, so you could just plug the model into it, bake the result, then Make2D…
HTH, --Mitch