Hi Andrzej, the change only applies to rectangles completely outside of the polygon. I don't know why those areas cause trouble in other areas. Maybe the old data was somehow corrupting the memory in MapSource. Gerd ________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Andrzej Popowski <popej@poczta.onet.pl> Gesendet: Freitag, 12. Januar 2018 13:17:55 An: mkgmap-dev@lists.mkgmap.org.uk Betreff: Re: [mkgmap-dev] mkgmap r4048 seems to fix problem with hill shading Hi Gerd, great, thanks for quick solution! I haven't looked at code but I think mkgmap builds internal poly from tiles area, when dem-poly is missing. So DEM in overview is still clipped. I haven't noticed artifacts in this case, was it different form irregular poly? -- Best regards, Andrzej _______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev