Use AutoCAD's "Extrude" and "Revolve" commands to turn 2-D designs into 3-D models. "Extrude" is how 3-D modelers to refer to the technique of stretching a 2-D shape into 3-D space. AutoCAD performs ...
SKP is a 3D file format that is native to SketchUp software, a 3D modeling software. Like any 3D format, SKP files also store 3D models, and they consist of sketches, layers, model information, ...