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f33e652
(Get the code!)
One thing we need to decide before this fix is released is what the value in this field should actually mean. It could be:
* the absolute diameter of the aperture,
* the difference in radius between the clearance aperture and the copper ring,
* the difference in radius between the clearance aperture and the drill hole
I think the way I've implemented it presently, it's the absolute diameter of the aperture, which is the value that's stored in pcb files. Since you don't always want to have any clearance, this might make the most sense, however, it's not what I'm used to.
FWIW, polygon clearance is stored as the difference in radius between the copper ring and the aperture in the polygon. So, when you say a clearance of 20 mils, there will be 20 mils of separation between the two copper objects.