The problem of finding intersection point of triangle mesh
4 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Now I have drawn a triangle mesh. (The function to generate image I use are as follows. )I want to ask for the intersection point, as shown in the figure(Red line with the mesh). But I don't know how to solve it.
PS:You can define the expression of a line at will,like "x=5".
If you want, I have some expression here.
trimesh(face', vertex(1,:), vertex(2,:), vertex(3,:),'LineWidth',1,'EdgeColor','k');
hold off;
vertex0=vertex';
V=vertex0(:,1:2);
x1=V(:,1);
y1=V(:,2);
z1=repmat(-20,1380,1);
tr = triangulation(face',x1,y1,z1); %x1.y1.z1 is a set of three coordinates of vertices
trimesh(tr);
axis equal;
colorbar('vert');
brighten(-0.1);axis on; % 'face' is the index list of triangle patch vertices;'vertex' is the index list of triangle vertex coordinates.
2 commentaires
Réponse acceptée
darova
le 24 Nov 2019
Modifié(e) : darova
le 24 Nov 2019
To check every edge:
for j = 1:size(face,2)
i1 = 1;
for i2 = [2 3 1]
% checking edges [1 2], [2 3], [3 1]
xx = [V(face(i2,j),1) V(face(i1,j),1)];
yy = [V(face(i2,j),2) V(face(i1,j),2)];
% intersection of edge and line x = [20 -150], y = [-40 -40]
[xc,yc] = polyxpoly(xx,yy,[20 -150],[-40 -40]);
i1 = i1+1;
% if intersection exists
if ~isempty(xc)
plot(xc,yc,'.r')
end
end
end
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Surface and Mesh Plots dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!