kicad-developers team mailing list archive

[Wayne Stambaugh <stambaughw@xxxxxxxxxxx>]

On 5/13/2014 1:23 PM, Lorenzo Marcantonio wrote:
> On Tue, May 13, 2014 at 01:14:07PM -0400, Kelton Stefan wrote:
> 
>> I'm experiencing this strange issue where the gerbers I generate produce
>> warnings when I try to import them into GC-Prevue. The warning says that
>> there are self-crossing polygons. It is my understanding that Clipper is
>> supposed to convert any self crossing polygons into several simple polygons.
>> What can be done to ensure that it is doing its job thoroughly. Has anyone
>> else experienced this issue?
> 
> Never happened to me... however it's correct that gerbers can't have
> self intersecting polygons... have you tried at least the 'butterfly'
> for a summary test?
> 
> Otherwise the incriminated board could be useful to pinpoint the issue
> 

I've had this problem several times as well when I view gerbers with
Pentalogix ViewMake.  My board vendor seems to be able to deal with it
just fine so I haven't flagged the issue.  I also think this issue is
related to the odd DXF exports that I am experiencing.  I'm not terribly
familiar with the zone polygon clipping code so I don't know how much
help I will be in resolving the issue.  I would be more than happy to
send someone an offending board to debug the problem.