# General ellipsoidal geometry in Gambit?

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 September 23, 2009, 15:51 General ellipsoidal geometry in Gambit? #1 New Member   Lee Join Date: Sep 2009 Posts: 1 Rep Power: 0 Sponsored Links Hello, Perhaps I'm overlooking something obvious (I hope), but I can't seem to find a simple way (i.e. without resorting to spline surfaces) to obtain the geometry I require in Gambit. Essentially, I need a volume which is a general ellipsoid, that is, one which may in general have different values for the lengths of each of the three semi-axes. It is straightforward to create an ellipsoid with two of the semi-axes of equal length by rotating a half-ellipse, but the general case does not seem so easy. It seems like this shouldn't be too difficult; in any reasonably-designed program, one could simply enter the equation of the surface, but unfortunately, I am forced to work with Gambit. Does anyone know of a simple way to do this? Thanks. Lee

 September 28, 2009, 02:13 #2 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,232 Rep Power: 34 create a 2d ellipse, delete the surface BUT keep edges create an edge which will be your revolution axis (you will have to split the ellipse edge --> ratio 0.5). delete the bottom edges of the half-ellipse create the surface of the upper side create volume with revolution around edge (revolve face) that's it __________________ In memory of my friend Hervé: CFD engineer & freerider

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