# How to find Intersection of 2 surfaces ?

10 vues (au cours des 30 derniers jours)
Jay Talreja le 24 Déc 2021
Commenté : Jay Talreja le 27 Déc 2021
Hello
I have two surface made from discreate data. I want to find the cordinates of intersecting line. The surface are named as
Surface1 = (A1,A2,C)
Surface2 = (B1,B2,C)
My problem is that as data is discreate so I am not able to know the precise intersecting points of the surface.
For reference I have attached the file.
I want to find cordinates of this particular line.
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Matt J le 24 Déc 2021
Modifié(e) : Matt J le 24 Déc 2021
Which is X, which is Y, and which is Z?
Jay Talreja le 27 Déc 2021
X is A1 and A2.
Y is B1 and B2
Z is C which is same for both graphs.

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### Réponse acceptée

Matt J le 24 Déc 2021
Modifié(e) : Matt J le 27 Déc 2021
One way,
F1=griddedInterpolant({A1,A2},C,'linear','none');
F2=griddedInterpolant({B1,B2},C,'linear','none');
figure(1)
surf(A1,A2,C','FaceColor', [0 0 1],'EdgeColor','none','FaceAlpha',1)
hold on
surf(B1,B2,C','FaceColor', [1 0 0],'EdgeColor','none','FaceAlpha',1)
xlabel x; ylabel y; view(-30,50); axis vis3d
xl=xlim; yl=ylim;
x=linspace(xl(1),xl(2),500);
y=linspace(yl(1),yl(2),500);
C1=F1({x,y});
C2=F2({x,y});
cm=contourc(x,y,(C1-C2)',[0,0]);
[~,coords]=getContourLineCoordinates(cm);
for i=1:numel(coords)
tmp=coords{i};
tmp(:,3)=F2(tmp);
coords{i}=num2cell(tmp,1); %coordinates of the surface intersection
end
for i=1:numel(coords)
[x,y,z]=deal(coords{i}{:});
line(x,y,z,'Color','g','LineWidth',3);
end
hold off
##### 3 commentairesAfficher 1 commentaire plus ancienMasquer 1 commentaire plus ancien
Matt J le 27 Déc 2021
The intersection line which I see from that I need their cordinates. I was unable to to find the variables where these values are stored
I had thought that XData, YData would give you the coordinates, but apparently I was wrong. I have updated my answer, using Adam Danz's File Exchange tool that you referenced. It works well, as the plot shows.
I there a way that I can see this contour line on my actual graph.
That is now demonstrated.
Jay Talreja le 27 Déc 2021
Yes now it is working as excepted. Thanks for help

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