Build a browser based rendering GUI

The project is about completing an already started javascript project. In the project [login to view URL] library is used to extrude a circular/tubular cross section through a path in 3D space determined by user entry. The entry needs to be 3 parameters i.e. Length of straight line, degree of bend, degree of rotation. These parameters shall be entered in a grid that is dynamic. This means as a user adds a complete set of the above parameters, another blank row appears ready for another set.