I provided an example of creating a cross hatched polygon in pcb-rnd in the following discussion thread, which can then be exported in kicad format for use in pcbnew:
There is also a related blog post:
We had to implement polygon cross hatching to allow export of non rectangular fills when saving in legacy Protel Autotrax/Easytrax file formats, but the :PolyHatch(interactive) routine can be used on any polygon in a layout.
IIRC, the PolyHatch() command is in svn head currently, but I believe the next pcb-rnd release scheduled for release in the next week or so will include it by default, so that debian/Ubuntu should have the new package which includes it shortly by default.
Two cautionary notes:
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kicad does not support arcs on copper, so any arcs on copper created in pcb-rnd will not export nicely to copper layers at present (interpolation with segments is planned)
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if you have vias in the polygon zone, their connectivity will not map properly during the round trip to and from pcb-new. In Eagle, gEDA PCB and pcb-rnd a polygon is just a polygon, not an “administrative zone” dictating connectivity of vias within it.
Enjoy responsibly,
Erich.