[Scilab-users] A plane intersecting a surface

[Stéphane Mottelet]

Hello Paul

Do you have an example of typical 3D data ? Can it be safely projected on a principal plane ? Is it noisy ? 

S.

> Le 6 sept. 2018 à 21:50, Carrico, Paul <paul.carrico at esterline.com> a écrit :
> 
> Dear All
> I’ve not been using scilab for a while, but I’ve a good opportunity to dive into it once again ;-)
> Is there a tool implemented into Scilab to determine the cross section of a 3D (experimental) surface and a plane?
> Note that :
> -          the curve has not a Cartesian equation and it is composed of a point cloud coming for experimental measurement,
> -          ideally the tool looks for the closest out of plane points in order to perform interpolations
> Before reinventing the wheel, I’m wondering if something exists.
> Nb: I built a saddle surface, but of course only points (not necessary equally spaced) exist in the real life.
> Thanks for any advice and suggestion
> Paul
> function [z]=saddle(x, y)
>     z = x^2 - y^2
> endfunction
>  
> // surface making ... of course in the real life the surface comes from exprimental data (no cartesian equation is attached on))
> n = 50;
> x = linspace(-2,2,n)';
> y = linspace(-1,3,n)';
> z = feval(x,y,saddle);
> plot3d(x,y,z);
>  
> // plane equation: ax + by + cz + d = 0
>  
>  
>  
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