OK I have a DDPAK component and I'm filling the top layer with a polygon. But I don't want the polygon to fill in under the DDPAK component.
If I put a ring around the component on the "keep out" layer, it will mess up the polygon I have on the bottom layer. I tried putting a "No Net" ring around the component which looks stupid. A top layer "keep out" does the same thing and also looks stupid.
The top layer keepout would be the way I would normally do this sort of thing. I would probably use one or more layer specific keepout fills around an sensitive parts of the design to control where the polygon should pour and where it should not. A thin strip of keepout fill is often enough to prevent the pour from encroaching into undersired spots.
It may look silly but remember that layer specific keepouts (Place-Keepout and check the choices) do not plot on gerbers.
Ian Wilson
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