CODEWITHSUNDEEP
matlabmatlab-figure
woofwoof
woofwoof

Reputation: 317

Add a line to a surface plot at a particular z value

I am trying to draw a line at z=0.5 for the following surf plot. The code is simple enough but now I want to include a line in the surf plot at 0.5 for example. My parameters are Xq, Yq and Vq, which I input into the surf command of MATLAB. Xq, Yq and Vq are all 2001x4001 matrices produced by meshgrid. I find the points in Vq equal to 0.5 given a particular tolerance, and I get out of the find command with and x and y coordinate, but I am lost from here on out.

What is the best way to accomplish this?

enter image description here

Upvotes: 1

Views: 1075

Answers (1)

Suever
Suever

Reputation: 65460

You can use contour3 to draw a line where your surface is equal to 0.5. You can specify that you want the 3D line where Vq is 0.5 by using the fourth input argument.

% Load in some sample data
[Xq, Yq, Vq] = peaks();

% Plot your surface
surf(Xq, Yq, Vq, 'EdgeColor', 'none');
hold on

% Now plot the 3D contour
contour3(Xq, Yq, Vq, [0.5 0.5], 'k');

enter image description here

If you want to get the Xq and Yq values that are associated with that contour, you can call contour3 with an output which will return a ContourMatrix associated with the contour

values = contour3(Xq, Yq, Vq, [0.5 0.5], 'k');

Upvotes: 2

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