Entity size can be changed during simulation. To do so, two Entity Types, with the size characteristics needed, must be created first. Then, a Direction Modifier may be used to change Entity Type at the desired location.
Typically, this can be useful when modelling passengers who drop off luggage, subsequently occupying a smaller footprint. A social distancing application might be to change a very large Entity Type (defined so as to include a prescribed social distance, for example) into a normally-sized Entity Type in order for entities to be able to pass through narrow infrastructure, like ticket gates.
Linked below is a short mini-model to illustrate a social distance-related example. The model is of an ascending escalator, operating across two separate accessible spaces, representing a lower and higher floor. Entities entering the model are deliberately much larger than normal, to include a social distance. As they reach the escalator, which they would not be able to enter at social distance size, a Direction Modifier object changes entities' Entity Type to one defined as normal size. Entities then ascend and on leaving the escalator, cross another Direction Modifier, which changes their Entity Type again, this time back to the social distance size.
LEGION Soc. Dist._Entity Size Change mini-model.lgm