Using parameter macros is the smart choice when running studies in which some parameter values need to be combined with another parameter while both are varying.

For example, a simple macro, without variables, recorded while generating a fibrous structure with FiberGeo, can be modified to create a parameter macro containing variables. The introduced variables, random seed, object solid volume percentage (SVP) and fiber diameter, are used in combination to produce sequences of random realizations of the structure with a certain object solid volume percentage, i.e. series of structures are generated for every chosen SVP, while the SVP is gradually increased and the fiber diameter decreased.