So, I designed a nice PCB outline in Inkscape, namely a hyper-ellipse using built-in function plotter. There is a script, svg2poly.ulp that allows to import a SVG path as a polygon to Eagle. I import it to the Dimension layer. Is there a way to convert a polygon to a line? Does the Dimension layer require lines, not polygons?
Another unrelated question: I will send Gerber files to the board factory. Are there practical limitations on the number of vertices in polygons or lines? My design uses ~100 vertices.