Hi Barend,

 

> Yes, I prefer that this issue is filed as a ticket. Especially after such a long time, and there were several items at that time, I cannot remember which was this issue and what I researched (though I can find these WKT's in my programs indeed).

 

Sure, done.

 

> Was this the issue with the spikey polygon going forwards and backwards over the same line? I remember that this was one of the issues you had. If that is the case, it will probably take longer to solve because I'm first concentrating on valid polygons...

 

Yes, I think one of them was exactly this issue. However, I cannot remember which one it was, either… It’s certainly a good idea to use Trac for things like this, so you can add your comments and they don’t get lost.

Thank you very much for your dedication!

   Volker