Fig. 1.

Hierarchical structure of the measurement prefab, as implemented in Unity. The measurement object has five child objects, as illustrated. Objects marked with ‘I’ have physics interactors. Blue and purple arrows indicate the linking of the connector lines to the start point, end point and label. Green arrows indicate the Unity scripts governing the scale of the objects. The red arrow indicates the redirection of editing (translate, rotate) from the connector to the measurement parent. Shapes, colours and label text are a representative example