# lib-openscad These fundamental modules are helpful when playing OpenSCAD. ## 2D - [line2d](https://openhome.cc/eGossip/OpenSCAD/lib-line2d.html) - [polyline2d](https://openhome.cc/eGossip/OpenSCAD/lib-polyline2d.html) - [circular_sector](https://openhome.cc/eGossip/OpenSCAD/lib-circular_sector.html) - [arc](https://openhome.cc/eGossip/OpenSCAD/lib-arc.html) ## Transformations - [hollow_out](https://openhome.cc/eGossip/OpenSCAD/lib-hollow_out.html)