Changing the z-location of a 2D triplot

Good day,

I have the following code:

 numx=3;
 numy=3;
 xgrid=0:(1/numx):1;
 ygrid=0:(1/numy):1;
 [X,Y] = meshgrid(xgrid,ygrid);
 DT = DelaunayTri(X(:),Y(:));
 triplot(DT)

Which works fine.

I am combing this 2D plot together with a 3D plot. Now I would like to shift the triplot from z=0 to some other z value, for example z=-1.

Can anyone tell me how to achieve this?

Thank you in advance!

Answer 1

[Shaunak]

Hello Pieter,

You can shift your 2D ‘triplot’ into a 3D space by using the ‘trisurf’ function in MATLAB.

This function allows you to specify a constant z-value for the vertices of the triangles, effectively lifting your plot to a specified z-level.

Here's a simple way to achieve this:

% Define the grid resolution
numx = 3;
numy = 3;

% Create grid points
xgrid = 0:(1/numx):1;
ygrid = 0:(1/numy):1;
[X, Y] = meshgrid(xgrid, ygrid);

% Create Delaunay triangulation
DT = delaunayTriangulation(X(:), Y(:));

% Define the z-value where you want to shift the triplot
zValue = -1;

% Create a z-coordinate array of the same size as X and Y, filled with zValue
Z = zValue * ones(size(X(:)));

% Plot the triangulation using trisurf, which allows you to specify Z
trisurf(DT.ConnectivityList, X(:), Y(:), Z, 'FaceColor', 'cyan', 'EdgeColor', 'black');

% Optionally, adjust the view to see the 3D effect
view(3);
xlabel('X');
ylabel('Y');
zlabel('Z');
title('Shifted Triplot in 3D');
grid on;

The above implementation shifts your 2D triangulation plot to the specified z-value in 3D space, allowing you to integrate it with other 3D plots.

For more information on the 'trisurf' function, you can refer to this link:

• 'Trisurf' function : https://www.mathworks.com/help/matlab/ref/trisurf.html

Hope this helps!