Quiver plot arrows hidden by surface plot?

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Mark Lepage 2019-4-24

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https://ww2.mathworks.cn/matlabcentral/answers/458315-quiver-plot-arrows-hidden-by-surface-plot

评论： Star Strider 2019-4-25

Hello all,

I am creating a surface plot, and plotting on top of this a quiver plot. Everything works great, however where I have large "z" values on my surface plot, the quiver arrows are being hidden by the graph.

Any ideas how to solve this? I have attached an image of my problem, look at the yellow boxes, where the quiver arrows are hidden.

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Star Strider 2019-4-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/458315-quiver-plot-arrows-hidden-by-surface-plot#answer_372150

在 MATLAB Online 中打开

I was considering something like this:

x = linspace(-pi, pi, 20);
h = x(2)-x(1);
[X,Y] = ndgrid(x);
Z = sin(X) .* cos(Y);
[U,V] = gradient(Z,h,h);
W = zeros(size(U));
figure
surf(X, Y, Z)
hold on
quiver3(X,Y,Z, U,V,W, 0.7, 'r')
hold off
shading('interp')
grid on
view(0, 90)

All the arrows are visible because they all plot with respect to ‘Z’. The ‘W’ matrix simply makes them plot in a plane. (I made them red so they’re more visible.)

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Mark Lepage 2019-4-24

Thank you very much, this has effectively solved my problem, and produced a much nicer graph.

Could you please explain a little more how to implement the z-offset on the quiver plot.

I believe 100% that this is the problem.

I appreciate your help a lot.

Star Strider 2019-4-24

My pleasure.

The Z-offset is simply the zeros ‘W’ matrix that effectively plots the arrows on top of the surf plot. Instead of 3D quiver arrows, the ‘W’ matrix creates the arrows as a 2D plane, however with their origins on the ‘Z’ values of the surf plot. You can see this by using the GUI (‘Tools’ -> ‘Rotate 3D’) or the view function to rotate the plot to see the arrows with respect to the ‘Z’ surface elevation. They all plot above it, regardless of where they originate.

That’s probably as well as I can explain it.

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