Plot multiple contours in 3D without volume data

Question

Daniel 2021-9-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1446189-plot-multiple-contours-in-3d-without-volume-data

回答： Daniel 2021-9-14

I am trying to plot multiple contours in the same 3D plot without volume data. The resulting plot would look like a slice plot with, for example, two orthogonal planes each showing a contour. Instead, I have data for two different contours that I would like to put in the same 3D plot orthogonal to each other. I have seen answers that allow you to plot multiple contours in 3D if you have volume data (contourslice or slice) or to plot multiple 2D lines in 3D using plot3, but I haven't seen version that can do what I'm looking for.

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Answer 1

Daniel 2021-9-14

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https://ww2.mathworks.cn/matlabcentral/answers/1446189-plot-multiple-contours-in-3d-without-volume-data#answer_787204

在 MATLAB Online 中打开

The key is use of hgtransform. Here's a snippet that hopefully provides enough info.

hold on
ax = gca; % get the current axis
HG = hgtransform(ax); % make it a transform object
[~,h] = contourf(xm_xz/D, zm_xz/D, curly, vlevels, 'LineStyle','none', 'Parent', HG); 
% make a plot using the transform object
HG.Matrix = makehgtform('xrotate', pi/2); % rotate it
Z_level = -8/D - 27/D;
h.ContourZLevel = Z_level;
[~,h] = contourf(xm/D,ym/D,curlz, vlevels,'LineStyle','none'); % next plot
countour_height = 31.5/D+0.5;
h.ContourZLevel = +countour_height; % move the last plot
hold off

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Answer 2

darova 2021-9-5

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https://ww2.mathworks.cn/matlabcentral/answers/1446189-plot-multiple-contours-in-3d-without-volume-data#answer_781174

在 MATLAB Online 中打开

You can use surf

t = linspace(0,2*pi,50);

[x1,y1] = pol2cart(t,1+0.1*sin(5*t)); % first contour

[x2,y2] = pol2cart(t,1); % second contour

[x3,y3] = pol2cart(t,0.5); % third contour

v0 = x1*0;

X = [v0; x1; x2; x3; v0]; % contantenate

Y = [v0; y1; y2; y3; v0];

Z = [v0; v0; v0+1; v0+2; v0+2];

surf(X,Y,Z,'facecolor','r','edgecolor','none')

line([x1 nan x2 nan x3],...

[y1 nan y2 nan y3],...

[v0 nan v0+1 nan v0+2], 'linewidth',2)

light

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Daniel 2021-9-14

Unless the facecolor can use another vector so you're plotting a quantity on the surface, this is not what I meant. A colleague figured it out. See answer below.

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