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Draw triangle on 3d mesh

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Jerry
Jerry 2020-4-18
评论： Steven Lord 2020-8-21
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).
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Steven Lord
Steven Lord 2020-8-21
This is a copy of the original question in case it gets edited away like this one.
"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)."

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回答（1 个）

darova
darova 2020-4-19
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')
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Jerry
Jerry 2020-4-19
no, unfortunately I don't
darova
darova 2020-4-19
编辑：darova 2020-4-19
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')

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