Plot 3D line on top of surface plot in Octave

问题

I have plotted a surface from some data. In the same plot I want to have a 3D line (I have the [x,y,z] values for the line I want to plot). When I try to do this using plot3(x,y,z) in the same figure, the line is always below the surface.

Is there any way to fix this? I don't know if this problem appears in Matlab as well.

Minimal example:

figure;
hold all;

y = x = 0:35;
z = ones(1,36).*0.5;
plot3(x,y,z);

[X,Y] = meshgrid(-8:.5:8);
R = sqrt(X.^2 + Y.^2) + eps;
Z = sin(R)./R;
surf(Z);

The result (the blue line is below the surface):

回答1:

To answer part of your question, you don't get this problem in MATLAB with the following code:

figure;
hold all;

x = 0:35;
y = x;
z = ones(1,36).*0.5;
plot3(x,y,z);

[X,Y] = meshgrid(-8:.5:8);
R = sqrt(X.^2 + Y.^2) + eps;
Z = sin(R)./R;
surf(Z);

回答2:

I also had this problem with surf in Octave, so I used the mesh function instead. It is not as pretty, and has different parameters but does allow lines to overlay it:

I created that with the same code as above but replacing surf with:

    mesh ((X+8)*2.2, (Y+8)*2.2, Z);

Because mesh needed its parameters to be scaled up. The result is roughly the same.

来源：https://stackoverflow.com/questions/16835454/plot-3d-line-on-top-of-surface-plot-in-octave