

It depends a lot on what you have in mind?
Something like a parametric mechanical gizmo will be very different than a sculpture thingy.
Parametric CAD:
I had to create a part that laid flat over decorative moulding. I took one end, traced its cross-section on paper, added an “L” traced with a square as a reference to compensate skew and to have an easy known dimension reference, then took a picture of that.
Opened in inkscape and traced path from bitmap, export to dxf, import into 3d cad software and use as sketch in the rest of the part.
Sculpting CAD:
Or maybe you’re talking about something like a mini and looking to do photogrammetry instead.
Haven’t tried that, but at least you know what it’s called










I hate the modern ones you need to hover above so they even display, and then it’s 1 pixel wide and a shade of grey that’s about 2% darker than white.
Less functional and 500 lines of js garbage.