threejs-slice-geometry
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support lines
they are basically normal geometries without faces, see here
This would require a very different approach to what I'm using for triangles, so it's out of scope for this tool.
all I did to make it work was this:
I don't see why you couldn't do 'virtual' faces on your side.
That's quite wasteful, a lot of work is done to deconstruct and reconstruct faces.