kicad-developers team mailing list archive

[Dick Hollenbeck <dick@...>]

> How are the zones filled at this point? If they are filled with other
> tracks, then we could just do a region-growing algorithm on all the
> tracks in that filled region, much the same way the netlist is created
> from segments by propagating net codes. For each net, select one pad
> and propagate to all others that are connected by line & endpoint
> radius considerations -> those not affected are not connected. I do
> not think it is possible to determine whether a via is connected to a
> zone without an actual fill 'plan' or 'instantiation'.
Further research is desired before a solution is chosen. I for one am 
not in favor of tying the solution to the fill tracks a.k.a "class 
SEGZONE" instances, if we can find an alternative.

We should start out with an objective of finding a solution based on the 
zone container and invasive tracks from other nets, and the clearance in 
play from those invasive nets, and any internal keepouts.

Many folks are doing this now, including freerouting.net. Even the 
Specctra DSN file spec has no notion of "fill tracks", so that means 
CADENCE specctra, electra, etc., have all managed to do it without the 
ho-key fill tracks.

Dick