drag = pan, pinch/wheel = zoom, tap = add point
Pick two points you've placed, then type the real-world cm distance you measured between those same two spots on the actual object.
| Span | Real cm | px/cm |
|---|
Or place a printed ArUco marker (dictionary DICT_4X4_50, id 0) flat next to the piece and auto-detect it - adds 4 calibration spans (one per edge) with no manual clicking. Measure your printout with a ruler first, since printers don't always scale exactly.
Point labels in order, comma separated (e.g. g,h,i,j,k). Sums segment-by-segment, each using its own nearest calibration.
| Label | Points | mm |
|---|