Lines sometimes visible, although under/behind slice layer (should be hidden) - depending on camera position

I have a Simulink-based 3D model of a wind farm and I plot the resulting wind speed on hub height using the coneplot and slice functions. Each wind turbine is indicated by a couple of simple lines using plot3 and fill3. The results look fine and can be saved as an animation:

I wanted to extend the animation by implementing a moving camera through the scene (based on https://de.mathworks.com/help/matlab/creating_plots/example-moving-the-camera-through-a-scene.html). However, I noticed that at some point, the results get weird. This happens when changing the camera settings in the figure window manually or through my script. It looks like the slice was not the top layer anymore, but the wind turbine line plots begin to overlay the slice layer. The proportion of overlay changes with moving the camera forward/back, there is no hard transition (which could occur if the order of objects was changed, i.e. wind turbine drawing to top instead of slice).

1) everything is fine:

2) first errors occur after a little forward movement:

3) fully developed incorrect visualisation after further forward movement. The rotor surface is now completely visible (although only the upper half should be visible and the rest should be covered by the slice layer) as well most of the wind turbine tower:

4) further forward movement reduces this behavor again:

To me, it looks like the figure itself is fine but there is some issue with the camera settings (at least in this specific case).

Where should I begin to look for the cause of this? What could be a possible solution?

[Adam Danz]

Is it possible for you to attach the fig file and share the section of camera motion code you're using?

[Nathan Hardenberg]

Maybe it is possible that you accidentally move the windurbines up/down during the simulation? It seems unlikely, but maybe there is a variable that gets used twice or something else. Thats at least something I would double check.

It could also be the slice plane that moves, but it does not look like it if you compare the grid lines in the back of the images you posted (always four equidistant spaces). And your arrows also stay in that plane.

And one Question: Your z-axis is labeled "v m/s", so probably the velocity. That does not really makes sense to me, since in your case it looks like a third spacial dimension and the color is velocity (or pressure?)? If this v is changing over time you maybe also change the z-height (e. g. if you do plot3(x,y,v)).

Those are just ideas i had

[v k]

I've attached a figure, which is a snapshot of the instantaneous wind speeds in the wind farm.

With its default camera settings, everything is fine. As soon as there is a slight movement forward, the visualisation gets erroneous.

For the camera movement, just step through (F10) the script attached. Or use the Camera Toolbar in the 'View' menu to manually adjust camera position forward/back.

As there is no change in time, it can be ruled out, that the turbine positions are being changed. The slice can't move either.

@Nathan Hardenberg you're totally right. The z-axis label is wrong, it shoule be "z in m". The color corresponds to velocity (I've removed the colorbar)

[Nathan Hardenberg]

There seems to be an issue when the camera is to close to the "plotted" area. Only then this glitches out. No clue what that could be. But I could reproduce the problem with similar code (see below). This can probably help when debugging. Maybe @Adam Danz has some insights, or you can make a bug report.

In the code the sine-plots should be cut exactly in half. But this does not happen, if you get "too close". This is even more obvious when looking at the "animation" (executing the code below on your device).

clear all
clf('reset')

x = -100:1:100;

[X,Y,Z] = meshgrid(x,x,x);
V = 1+sin(X/20)+cos(Y/20);

f1 = figure(1); 
h = slice(X,Y,Z,V,[],[],[0],"linear");
set(h,'edgecolor','none');
hold on;

plot3(x, -60*ones(1,length(x)), 5*sin(x/1.5), LineWidth=3)
plot3(x, -20*ones(1,length(x)), 5*sin(x/1.5), LineWidth=3)
plot3(60*ones(1,length(x)),x, 5*sin(x/1.5), LineWidth=3)

axis equal
axis vis3d
xlabel('x');ylabel('y');zlabel('z');

xvec = linspace(-400,-40,400);

camtarget([0 0 0])
camva(40)
camproj perspective

for x = xvec
    campos([x,0,20])
    drawnow
end

Also sometimes red plot lines get drawn over the camera in your example, see below:

[Adam Danz]

Thanks for the files @v k and thanks @Nathan Hardenberg for the reduced reproduction steps.

I suggest contacting tech support and to include the reproduction steps and any files needed to reproduce this behavior.