Block Format Keyword Describes the surfaces inside the box.


Only one box is allowed:
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
/SURF/BOX/surf_ID/unit_ID or /SURF/BOX2/surf_ID/unit_ID


Field Contents SI Unit Example
surf_ID Surface identifier

(Integer, maximum 10 digits)

unit_ID Unit Identifier

(Integer, maximum 10 digits)

surf_title Surface title

(Character, maximum 100 characters)

box_ID Box identifier, which is defined in Boxes

(Integer, maximum 10 digits)



  1. All nodes must belong to a shell element, a brick element or a triangular shell element.
  2. A surface cannot be defined using Madymo surfaces.
  3. A surface cannot be defined by associating a hyper-ellipsoid and another type of surface.
  4. If type is BOX, all segments supported by solids, shells and 3-node shells with all nodes inside the box or on its external surface are selected (segments lying on solid elements are not considered).

    If type is BOX2, all segments with at least one node inside the box or on its surface are selected.