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Justyna posted a topic in AutoLISP, Visual LISP & DCLHi everyone! I need help to write an application which would do the following: - compare 2 drawings on the 3rd one (yes, I'm familiar with COMPARE plug in from Autodesk,) - both drawings are 2D, railway design built from lines and arcs on different layers - the application should compare those 2 designs and give as output: if the design is partly this same (no displacement) - grey line/arc. - if the shift/ displacement between 2 designs is less than 10cm - green line/circle - if the shift is equal or more than 10cm (=>) - red - the part of design that is =>10 cm on the 1st drawing - make black with dotted line (line type:HIDDEN 5), what means that this part has to be demolished. I paste drawing for general overview. drawing 03-08-2017.pdf I hope is clear - otherwise please ask me for better explanation HOW I DID IT TILL NOW? I copied the 2 drawings into the 3rd one, with this same scale, units, etc. I used commando OFFSET and value 10cm Everything what was above- I made red, what was under - made green, and the lines which were overlapping- grey. Disadvantages : - you have to check km of lines - you have to use BREAK A POINT every time lines crosses my 10cm offset Any ideas?