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Improve detection of silkscreen over vias


I was thinking of looking into making KiCad better at alerting when
silkscreen markings are over a via (since it won't show up when fab'd), and
was wondering where might be a good place to start.

I also heard from one fab to not silkscreen over annular rings, so was
thinking of adding a config option to filter those intersections out as

Some options, perhaps in increasing order of difficulty:

1. Add an option to the raytracer to clip silkscreen over annular rings (it
already can filter out silkscreen over vias).

2. Improve the OpenGL renderer to clip text over vias & annular rings.

3. Add a DRC check to detect silkscreen intersecting vias / annular rings.

Any thoughts or recommendations?


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