Why does appear in a 3D mesh plot lines that should not be there?

Following the first example in the mesh documentation:

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

It should appear this:

But when I run the code, it appears other lines that are not in the example. I do not know why this is happening.

The funny thing is that if I copy the figure using Edit/Copy Figure it copies the image without those lines. Pretty strange.

Answer 1

[Titus Edelhofer]

Hi,

might be a problem with your OpenGl driver ... You could try either

set(gcf, 'Renderer', 'zbuffer')

or to switch from hardware opengl to software opengl:

opengl software

Let us know the outcome of either of those ...

Titus

[Dani Tormo]

The first option worked!

I will try the next one if the problem persists.

Thanks!

[Mike Garrity]

I think that was a bug in how a particular family of graphics card drivers handled OpenGL index buffers. I think that it was nVidia, but I'm not sure I'm remembering correctly.

As for it not showing up when you copy the figure, my guess would be that you have 'Preserve information' set in your Copy Options. That uses painters instead of opengl.

Anyways, the opengl renderer in MATLAB R2014b contains a workaround for this issue. I'd be interested to know whether you still encounter it after upgrading.