I'm serious. The basic tools found in SketchUp's are the same ones found in the good old MS paint. There is the line tool, shape tool, eraser, paint bucket and everything else. The only things that ...
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, ...