smr02

@JiamingSuen Amazing!

@Moult, right. I'm still trying to figure out my workflow. I guess, FreeCAD can't display a boolean difference void yet? Can it create them? 

@luzpaz ``` OS: Ubuntu Core 20 (ubuntu:GNOME/ubuntu) Word size of FreeCAD: 64-bit Version: 0.21.0.33668 +7 (Git) Snap 727 Build type: Release Branch: tag: 0.21.0 Hash: 41b058e2087de60dc8fef3d3e68c7d0129e13abf Python 3.8.10, Qt 5.15.7,...

I'm facing the same issue. It seems to be fixed by replacing: https://github.com/nschloe/meshio/blob/0138cc8692b806b44b32d344f7961e8370121ff7/src/meshio/_mesh.py#L179 with ``` python for k in [i for i, x in enumerate(data) if x is not None]:...