Re: [brlcad-users] Creating an Ogive shape in BRL-CAD

[Philippe de R. <ph...@fr...>]

Hi,

Have you tried creating either an Elliptical Hyperboloid (ehy) or an Elliptical Paraboloid (epa) in BRL CAD?

Cheers,

Philippe



> Le 13 oct. 2014 à 17:08, Cook, Kathy <kat...@lm...> a écrit :
> 
> I am looking for suggestions on the best way to model a nose cone section that is formed as a tangent ogive (or any other ogive shape for that matter).  There would be an outside ogive solid and an inside ogive solid subtracted from it to form the nose cone skin. For a tangent ogive, the base would be tangent to a following cylindrical component with radius, R, and the nose cone would have a length, L.   The ogive shape is defined by an ogive radius, p, whose origin is at the base and p>= R. (note these formulas are from Wikipedia, Nose_cone_design)
>  
> p = (R^2 + L^2)/(2R)
>  
> The shape is revolved around the centerline and the distance, y, from that axis to the surface is at any point, x, is:
> y=sqrt(p^2 – (L-x)^2) + R – p
>  
> For my purposes, the centerline for revolution is the model x-axis and the tip of the outer nose cone would be at x=0, but I guess this would not be the case in general, but could be constructed that way and then the component (region) formed by subtracting the two ogives  translated/rotated to its location in the overall model, if that is possible.
>  
> So, what would be the best way to go about this and get a relatively smooth surface?
>  
> Thanks,
>  
> Kathy
>  
>  
>  
>  
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