World-to-paper transform: maps a world-space point (metres) to a point on the PDF page (millimetres), with Y flipped (paper Y grows downward, world Y grows "up"/"north" depending on section axis).
mm on paper per metre in the world. E.g. 1:100 -> 10; 1:50 -> 20.
World-to-paper transform: maps a world-space point (metres) to a point on the PDF page (millimetres), with Y flipped (paper Y grows downward, world Y grows "up"/"north" depending on section axis).