Block Format Keyword Describes the hyper-ellipsoid surface definition.


(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
skew_ID n                
Xc Yc Zc        
a b c        


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)

skew_ID Skew identifier defining the initial orientation of the surface


n Degree of the hyper-ellipsoid

Default = 2 (Integer)

Xc Center coordinate


Yc Center coordinate


Zc Center coordinate


a Semi-axis length


b Semi-axis length


c Semi-axis length




  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. The equation of the hyper-ellopsoid is:
    | x x c a | n + | y y c b | n + | z z c b | n = 1
  5. A hyper-ellipsoid can only be a main surface of /INTER/TYPE14.
  6. Input format for MDELLIPS, see /SURF/MDELLIPS.