Translations:Part EditAttachment/73/en

This is a special mode for folding polyhedra. Select four lines that share a common point in this order: contour line (1), fold line (2), other fold line (3), other contour line (4). To determine the coordinate system the selected contour lines are made coincident by rotating line 1 around line 2, and line 4 around line 3. The origin is matched with the common point, the X axis is matched with line 2, the Y axis is aligned towards the direction of the coincident contour lines.