Hierarchical models (GMS)

GMS (grid modeling system)(Nakano and Nakajima):
The same way as SPMODEL but for finite difference models

Define and prepare operators by the use of structured variable
Variables are defined as structured 
Functions (such as adding, subtracting, ...) should be prepared and explicit memory handling are needed.
Indices are eliminated

Can it be used for vertical difference of 3D primitive model???