Tools > 3D Features > Fit to 3D Features - restructures corresponding polygons to match the ideal geometry of a 3D Feature.
Features group - specifies the one or more 3D Features on the object that will influence the restructuring when you press Execute.
Filter dropdown (All, Plane, Cone, Cylinder, and Sphere) - limits the members of the List to the 3D Features of a given type.
List of 3D Features - Click one, Ctrl-Click two or more, or Shift-Click several names. The highlighted 3D Features will affect the restructuring when you press Apply.
Selection group - specifies the method by which selected Features will influence the restructuring
Unnamed radio buttons -
Correspondence radio button - specifies that only "corresponding" polygons will be shifted to match the ideal 3D Feature. See the definition and instructions for editing a correspondence at Tools > 3D Features > Create 3D Features, Detect 3D Features, or Edit 3D Features.
By Distance radio button and Max. decimal field - specifies that polygons touching the 3D Feature(s), and polygons that are within Max. distance of the 3D Feature(s), will be shifted to match the 3D Feature(s).
Apply button - restructures existing polygons to match the 3D Feature(s).
Next button - accepts the most recent fitting and prepares the dialog for a subsequent operation.
OK button - accepts the most recent fitting, saves changes to the object in the Model Manager, and closes the dialog.
Cancel button - terminates the dialog without saving changes to the object in the Model Manager.