You can select elements and "land" them on the surface of other elements.

Calling:

ac_request("do_elements_landing", int iLandList, int iLandingElemsList, double doffset, int mmode);


Here:

iLandList - number of the internal list of elements where the elements defining the landing surface are selected.

iLandingElemsList - number of the internal list of elements where the elements to be landed are selected.

doffset - height above the ground at which to stop landing.

mmode - 0 - to land each element separately, 1 - to land taking into account the grouping according to the younger group, 2 - taking into account the grouping according to the senior group, 3 - the group of elements as a whole.