Retrieves the fault lines from a surface.

surf_id—(long) A valid ID for a gridded surface.

result—A (2,*) array defining the fault lines.

Maxpts—(long) Limits the number of points in the faults array.

Num_faults—(long) Returns the number of faults in the input variable.

The value of surf_id is obtained from the Surf_id keyword in the GTGRID function or from the output of the GTINSTALLSURF function.

Use GTGETFAULTS to regenerate fault vectors that were used to generate the grid for that surface. For example, after restoring a surface from a file (GTRESTORESURF) use GTGETFAULTS to obtain the fault vectors that were used to generate the grid.