Fill the interior of a cylinder surface - SURF - generated by parametric equations
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William
il 4 Mar 2015
Commentato: Jetsadaporn Simsiriwong
il 15 Ago 2017
I've generated a cylinder using the parametric equations:
u = linspace(0,2*pi,50);
v = linspace(0,2*pi,50);
[u,v] = meshgrid(u,v);
x = cos(u);
y = sin(u);
z = v;
where u and v are 0-pi.
I've got a plot surf(x,y,z) of this cylinder and I want to fill all the interior points. Does anyone know how I can do this?
How can I do this?
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Brendan Hamm
il 5 Mar 2015
Modificato: Brendan Hamm
il 5 Mar 2015
If you are trying to just put anything in that location you can do the following to place circles there. First create a meshgrid of the x-y space.
surf(x,y,z)
hold on
u2 = linspace(-1,1);
v2 = u2;
[x2, y2] = meshgrid(u2,v2);
% Find distances
dist = sqrt(x2.^2 + y2.^2);
dist(dist>1) = 1;
dist(dist<1) = 0;
dist = logical(dist); % Logical matrix of exterior points
% Set exterior points to NaN
x2(dist) = NaN;
y2(dist) = NaN;
z2 = 2*pi*ones(size(x2)); % Just the highest point.
scatter3(x2(:),y2(:),z2(:)); % Scatter expects vectors, so stack everything
If you wish, you can fill the markers, change the colors, etc. If you need all the points filled you just need to do this for each value of z(:,1);
3 Commenti
Brendan Hamm
il 8 Mar 2015
The process would be similar as you can still solve for the boundary of your shape at each value of z in your grid.
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