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The functions XBOUNDARY, YBOUNDARY and ZBOUNDARY allow the user to search for the position of a system boundary from an evaluation point:

 

XBOUNDARY("boundary name")

YBOUNDARY("boundary name")

ZBOUNDARY("surface name")

ZBOUNDARY(surface_number)

 

In each case, the function returns the X,Y or Z coordinate of the named boundary at the (Y,Z), (X,Z) or (X,Y) coordinates of the current evaluation.