Number of items in the string array and the
dir array. (Min = 1, Max = 150)

Number of items in the ID array for each string.
(Min = 1, Max = 402)

Indication of whether the string defined in id
should start from the beginning of the first curve
or the end of the first curve. This should be set
to either UF_MODL_CURVE_START_FROM_BEGIN or
UF_MODL_CURVE_START_FROM_END.

The array of items defining the string. This array
should be as long as the total of the number of
items indicated in string. Although not all
functions allow all the data types, this array can
typically include curves, faces and edges.