OpenSCAD, drawn as you type

The OpenSCAD reader the library ships -- the one behind cadaclysm.open("part.scad") in every language, the viewer and the desktop apps -- running in your browser. Edit the file on the left and the mesh on the right follows; a mistake is reported with its line. Drag to orbit, Shift+drag to pan, wheel to zoom. The menu holds more files; yours can be opened and saved, and nothing is uploaded.