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A friend of mine asked me this question, but I don't know if it is possible or not. If it is possible, please show me how to construct it. If it is not possible, please prove it. Thanks.

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object

Created in Fusion 360, this is a 3D object with a cross section of a circle when viewed from above, a triangle when viewed from one side and a square when viewed from another side 90 degrees from the first.

ortho views below:

circle cross section

square cross section

triangle cross section

The process is thus:

  1. sketch and extrude a square, creating a cube. select a face/plane,
  2. sketch and extrude a triangle, boolean intersect the two solids
  3. select a face/plane, sketch and extrude a circle, boolean intersect.

This is the sequence in creating an ambigram, a three dimensional object in which the appearance changes when viewed from different (orthogonal) angles.

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  • $\begingroup$ Reminds me of some screwdriver bits. $\endgroup$ – Dan Getz Oct 18 '19 at 17:05

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