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Hi, I am a PhD student currently working in a company in the Netherlands and I am using Klayout and Nazca for Photonic chip layout design. My main assignment is to investigate the grid snapping error when exporting the design from Nazca to Klayout.
It seems there is a random snapping of points when Klayout truncate floating coordinates after defining or moving polygons to the left or to the bottom. As you can see on the picture above, when the polygon is move to the left by 0.5nm, only the points on the left side is moved but not the points on the right, which effectively widen the polygons. Truncation of 0.5 to 1 nm didn’t happen for points on the right side. This happens for polygon of certain size and shape and the occurrence seems to be random.
I am wondering if there is an internal mechanism in Klayout that disable truncation in certain cases. Thank you very much for you time.