The OpenSCAD script rotates the objects to the correct orientation and intersects them to form the final object. Just having a 3D shape of one view isn’t sufficient, though.

used pstoedit to convert the EPS output to DXF format. DXF files are still two dimensional, but OpenSCAD can extrude DXF files into 3D shapes. Inkscape is a vector graphics program and generally creates SVG files, although it can also save EPS files. They aren’t exactly orthographic projections of the final product, but the idea is similar. His final product though, was made by creating two views in Inkscape. When wanted a laptop stand for his workbench, he started trying to do a 3D model. After all, the 3D printer software is going to expect a model. These days, you are more likely to create a 3D model of an object, especially if you are going to 3D print it. Even if you didn’t take the class, you’ve probably seen drawings like this where you view a 3D object as a series of 2D views from different angles. If you had a formal drafting class, you probably learned about making orthographic projections–engineering drawings with multiple views (for example, top, front, and right).

Inkscape 2d to 3d