The device (20) has two sources arranged such that directions of the two sources are not parallel. Light sources (S1, S2, S3) include adjustable light intensity with an arrangement such that direction (D1) of a source is not parallel to directions of other...

The method involves determining an authorized circulation pipe between initial and final positions, for a particular point (P1), and calculating a current position and a current direction of displacement of the point. A target direction of the point for di...