Re: gEDA-user: Adding inner polygons to a plane

[Duncan Drennan <duncan.drennan@xxxxxxxxx>]

> Packages like Altium (which springs to mind), let you define a layer in
> terms of its _negative_, so you split up a power plane by defining the
> _boundary_ between the two (or more) regions.

Negative layers are great for defining planes, especially when you
want complex splits...and they don't need to be rendered.

The solder mask layer is output to gerber files as a negative layer.


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