Surface : Modifier
surface - superclass: modifier; super-superclass:MAXWrapper - classID: #(321410692, 1573287214) 
Constructor
surface... Properties
<surface>.threshold Float default: 1.0 -- animatable The overall distance that is used to weld the vertices of the spline object. All vertices/vectors within the threshold of each other are treated as one.
<surface>.steps Integer default: 5 -- animatable The number of steps used between each vertex. The higher the step count, the smoother the curve you will get between vertices.
Note:
The Flip Normals, Remove Interior Patches, and Use Only Selected Segs. properties are not accessible by MAXScript.