>Apple has been doing this to the corners of laptops and iMacs for years, but this type of rounding didn’t penetrate iOS until version 7. This shape has classic

>Apple has been doing this to the corners of laptops and iMacs for years, but this type of rounding didn’t penetrate iOS until version 7. This shape has classically been difficult to achieve, because it wasn’t available in 2D design editors, though that’s starting to change. (My emphasis) However, bizarrely, it has been available in full 3D in parametric mechanical CAD for at least 20 years thanks to the advanced 3D blending functionality in the underlying modeling kernels: Parasolid, ACIS, ShapeManager etc. Meanwhile, the 2D sketching environment in those programs has lagged w.r.t. curvature continuous fillets. Witness this Solidworks 2012 tutorial on GrabCAD by Leandro Fernandes[0]. Because of the relative weakness of the 2D sketcher compared to 3D with respect to filleting, Leandro does (roughly) the following strange hack: 1. creates the profile of the wheel rim in the 2D sketcher 2. rotates the profile to form the 3D rim 3. fillets the profile in 3D 4. merges all the faces into one face 5. intersects the filleted 3D profile with a section plane to get back into 2D [0] https://grabcad.com/tutorials/tutorial-how-to-model-a-bbs-lm-wheel-in-solidworks-and-show-design-intent--1 https://grabcad.com/tutorials/tutorial-how-to-model-a-bbs-lm...