# Old Fashioned Geometric Design

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 March 6, 2007, 05:51 Old Fashioned Geometric Design #1 Paolo Lampitella Guest   Posts: n/a Hi to everyone, i'm working on my own 3D panel code and i'm trying to implement a simple geometric model for the entire aircraft. What i have are two different models, the NACA 4-digit wing model (with spanwise variation of the coefficients) and the super-ellipse cross section with variation of the coefficients along the fuselage. Now i would combine the two models but i don't know how to make the intersections and obtain two surfaces that exactly match in the same grid points. Any help is appreciated.

 March 6, 2007, 10:33 Re: Old Fashioned Geometric Design #2 Charles Guest   Posts: n/a Have a look at Open Cascade (www.opencascade.org)

 March 6, 2007, 12:07 Re: Old Fashioned Geometric Design #3 Paolo Lampitella Guest   Posts: n/a Thanks for your suggestion, it is a very interesting site, but what i'm looking for is a low level mathematical tool because i'm not able to handle such complex surfaces (NURBS, B-Splines). What i need is more like: "Given the points on a boundary of a 3D surface and the approximate slopes at this boundary (in function of adjacent points) how can i obtain the internal points of the surface that is as smooth as possible?" Obviously i'm looking for the simplest method available because i will handle always the same case and i don't want to build a CAD. Thanks again.

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