Quim Moya

When disabling FAST_BOOLS many models fail to load. The error message could vary, but is something like this:  or this  testing files: [S_Office_Integrated Design Archi.zip](https://github.com/IFCjs/web-ifc/files/9313960/S_Office_Integrated.Design.Archi.zip) [15.zip](https://github.com/IFCjs/web-ifc/files/9313965/15.zip)

This pull solves the issue #21 and #121

Improved example of IFC edition in examples/nodejs/index.js

Hello Is it possible to define closed NURBS in U or V or both?

Incorrect shadows

3

Some models expose incorrect shadows  This image shows shadows in non-visible faces of the model. Shadows must be applied on the visible faces only