How to create strata boundary line

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If you want to know strata area, you can still use the "polyline" command. If wall thickness is unique, you can just pick up outer of building corners to create a ployline then offset inward by half of width of wall. If the wall thinness is not unique, in other word, varies with different segment, then you have to create some auxiliary lines to link all pair of corners in order to find out center of wall. And after creating the polyline, you need to delete all auxiliary lines. Is it possible to create polyline without creating auxiliary lines in advance, instead, can we just pick up wall corners then create the polyline straightforward? The answer is Yes. Just pick up points, then create polyline, no auxiliary lines, no deleting. That is it.

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