I think it’s the same kind of thing that makes parts of filled fonts sometimes cut each other out. I think it’s called like the inside out rule or something… googling to be sure.
EDIT: nope, it’s the even-odd rule.
I suppose it’s time to file my annual bug report that the Glowforge software still does not support “fill-rule: evenodd” in SVG files.
Simplest possible test case:
This SVG donut will render as a filled circle in the Glowforge UI (and will be engraved as a solid circle). The Glowforge ought to treat it exactly as the web browser does: a donut shape. (If your web browser doesn’t show a blue donut here then you need to upgrade your browser.)
[even-odd donut]
This PDF conversion of the file dis…
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