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By cover, do you mean roof? it is no problem to make two arches, offset them, and make use a morph to cover them if that what you mean. https://www.screencast.com/t/PcMe3UhMm
I assume that it doesn't matter too much because there is going to be a limit. Use all 1's if you like. Typing in a bunch of 9's is just a way to make sure you have reached it. For all I know 99 is enough I don't care, as long as I know I have made it as smooth as it cab be. And like I said, I never have any problems with making everything as smooth as I can. The idea is to just click one digit any digit not 0 a few times because we don't know what the limit is and 7777777777 or what ever will do the job.LaszloNagy wrote: ↑Sat May 18, 2019 9:29 pmThat 9999 resolution sound way too much to me. That means that a full circle is approximated using cca. 10000 lines, a half-cylinder is approximated using 5000 polygons, a half-dome is approximated using 5000x5000 polygons, just for a single object.
The default resolution in GDL is 36, so a resolution of 72 or 108 or 180 could be more than enough for display purposes.
Of course it also depends on the absolute size of the element. A 100 m element will need a higher resolution than a 10 m element.