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May 10, 2018, 02:36 AM
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3D modeling in freecad

Got a somewhat acceptable wing by creating 4 profile sketches, then lofting them. Freecad can't create a solid from a surface, so you have to create 2D slices for the lofting operation, with matching curve & line segments. Freecad did manage to interpolate the sketches into a smooth curve. Suspect this process would be much easier to tweek & give smoother results if it was built up from equations rather than paw sketching, but the reference design is going to change. The automated version would have to use a constant number of line segments for each profile sketch instead of curves.

The only way to create windows was writing the basic equations in a python script. There are no basic cutting, pasting, copying functions in the sketcher. The lion kingdom wanted see through windows instead of textures.

The script created a window creation tool. Then the tool cut out windows you can see through. OpenCAD has a few rounding errors, causing some windows not to open. Offsetting by 1mm in random places seemed to work. There's the issue of a tinted, reflective texture. The whole model may end up being from equations. Tweeking is a buster because it takes a long time to recompute the model.

The parts -> thickness tool doesn't work at all with booleans or constantly locks up. The only way to make hollow solids is sketching a cross section & revolving/lofting with solid mode enabled.
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