Draw triangle on 3d mesh
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Hi, I have an irregualar 3d surface plot build just with faces and vertices. Now I want to select 3 random points from the plot and automatically draw a triangle with these corner points on top of the surface (so that the triangle nestles on the given 3D surface).
5 Commenti
Steven Lord
il 21 Ago 2020
"Hi, I have an irregualar 3d surface plot build just with faces and vertices. Now I want to select 3 random points from the plot and automatically draw a triangle with these corner points on top of the surface (so that the triangle nestles on the given 3D surface)."
Risposte (1)
darova
il 19 Apr 2020
What about this?
function main
opengl software
h = surf(sphere(20));
axis vis3d
set([h gcf],'hittest','off') % не знаю почему
set(gca,'buttondownfcn',@func) % клацать только на 'axes'
function func(hobj,hev)
p = get(hobj,'currentpoint');
p
line(p(:,1),p(:,2),p(:,3),'marker','o')
4 Commenti
darova
il 19 Apr 2020
Modificato: darova
il 19 Apr 2020
I want to explain you how does it work: you can't choose points you want directly. But you can pick some point and then calculate distances from this point to every existing points on plot. Having smallest distance using min you can choose closest point
Here is a simple script
x = rand(20,1);
y = rand(20,1);
plot(x,y,'.b')
p = ginput(1);
[~,ix] = min(pdist2(p,[x y]));
line(x(ix),y(ix),'marker','o')
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/285824/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/285825/image.png)
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