plotting a triangle with surf

Hi all,

I have plotted a ellipsoid with the surf function and would like to add a triangle to this plot in a way, so that i can specify the height and length of the triangle.

Is this possible?

Thank you for your help!

Answer 1

[Abhas]

Hi @Carsten,

Yes, you can add a triangle to your existing 3D plot in MATLAB. You can use the "patch" function to create a triangular surface by specifying the vertices of the triangle.

Here's an example to achieve the same:

[x, y, z] = ellipsoid(0, 0, 0, 5, 3, 2, 30);

figure;
surf(x, y, z);
hold on;

% You can adjust these coordinates to change the position, height, and length of the triangle
v1 = [1, 1, 1]; % Vertex 1
v2 = [4, 1, 1]; % Vertex 2
v3 = [1, 4, 3]; % Vertex 3

% Create the triangle using the patch function
patch('Vertices', [v1; v2; v3], 'Faces', [1, 2, 3], 'FaceColor', 'red', 'FaceAlpha', 0.5);

% Set the axis for better visualization
axis equal;
xlabel('X-axis');
ylabel('Y-axis');
zlabel('Z-axis');
title('Ellipsoid with a Triangle');

% Adjust view angle for better visualization
view(3);

You may refer to the below documentation links to know more about "patch": https://www.mathworks.com/help/matlab/ref/patch.html

I hope this helps!

[Carsten]

Thank's alot, worked perfectly.