Dear all
Thanks Christophe, Rafael and Stéphane for the first feedback;
Only obvious things in the code hereafter, but it highlights I guess what I
would like to do (to cross section the surface); the results are not really
noisy and their number is of about few hundred.
Concerning the Delaunay approach, I thought about it but I've been thinking a
simplest solution may exist if I can plot the surface (interpolation from the
grid) ?
Paul
###########################################
mode(0)
function [z]=saddle(x, y)
z = x^2 - y^2
endfunction
function [z]=x_square(x, d)
z = x^2 - d^2
endfunction
function [z]=y_square(y, d)
z = y^2 - d^2
endfunction
// surface making ... of course in the real life the surface comes from
experimental data (no Cartesian equation is attached on))
n = 50;
x = linspace(-2,2,n)';
y = linspace(-1,3,n)';
z = feval(x,y,saddle);
scf(0);
plot3d(x,y,z);
// obvious cases
// n = (0 1 0) then z = x^2 - d^2
d = 0;
z1 = x_square(x,d);
scf(1);
plot(x,z1);
// n = (1 0 0) then z = d^2 - y^2
d = 0;
z2 = y_square(y,d);
scf(2);
plot(x,z2);
-----Message d'origine-----
De : users [mailto:[email protected]] De la part de Dang Ngoc
Chan, Christophe
Envoyé : lundi 10 septembre 2018 09:15
À : Users mailing list for Scilab
Objet : [EXTERNAL] Re: [Scilab-users] A plane intersecting a surface
Hello,
> De : users [mailto:[email protected]] De la part de Rafael Guerra
> Envoyé : samedi 8 septembre 2018 14:52
>
> If your cloud of points behaves well enough, you can interpolate it first
> into a dense
If nobody is expert in this field, then I could invoke a memory when I was a
student.
I've heard about an algorithm using intercept with tetrahedrons,
it was used for surface rendering.
So you might perform a Delaunay tessellation of your cloud,
determine which tetrahedrons are cut
and determine the coordinates of the intercepts.
Or ask some CGI specialists.
HTH
Regards
--
Christophe Dang Ngoc Chan
Mechanical calculation engineer
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