kicad-developers team mailing list archive

[Kelton Stefan <kelton.stefan@xxxxxxxxx>]

Hello!

I tried sending an offending board file to JP Charras, but never heard 
anything back, maybe it was blocked. If I plot gerbers from it, they 
exhibit the problem with having self-intersecting polygons. Does anyone 
else want to look at?

Here is a link to it: 
https://drive.google.com/file/d/0B3AfPBE03TLaUXAtQVJFR1pmNnc/edit?usp=sharing

Kelton

On 5/13/2014 3:48 PM, Lorenzo Marcantonio wrote:
> On Tue, May 13, 2014 at 02:52:05PM -0400, Kelton Stefan wrote:
> > Lorenzo, I'm not exactly sure what the 'butterfly' is that you mention I
> > should produce a summary test with. Can you explain?
> This is a quad:
>
> 3        2
>   --------
> |        |
> |        |
> |        |
> |        |
>   --------
> 4        1
>
> swap the node 1 and 4, twisting the polygon, and you have the butterfly:
>
> 3        2
>   --------
>   \     /
>     \ /
>     / \
>   /     \
>   --------
> 4        1
>
> AFAIK that's the simplest self intersecting polygon you can have. Also
> the bane of all the polygon algorithms (it would be convex, too, anyway!)