Help with 3D contours aligned to discrete surface data
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Brantosaurus
on 11 Oct 2022
Commented: Star Strider
on 11 Oct 2022
Running the included code produces the included plot.
Basically a 3D plot of Z along a non-equi-spaced orthogonal mesh in x and y. It generates 3D contours, but they do not lie on the surface. Most are hidden on the reverse side.
Close inspection suggests they appear to lie on a 'smoothed' invisible surface offset from coloured surface. I'm obviously missing something, but if possible, i wish to have black contour lines aligned with the colour interpolated surface.
Data;
figure()
surf(pc,of,c,...
'LineStyle','-',...
'EdgeColor',[0.5 0.5 0.5],...
'FaceColor','interp')
zmin=min(c(:));
zmax=max(c(:));
xlabel 'P_c [bar]'
ylabel '(o/f)_m'
zlabel '{\rho} [kg/m^3]'
set(gca,'xscale','log','yscale','log')
hold on
number=20;
range=zmax-zmin;
inct=range/number;
contourl=zmin:inct:zmax;
contour3(pc,of,c,...
contourl,...
'k')
hold off
colormap (jet(256))
colorbar
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Accepted Answer
Star Strider
on 11 Oct 2022
Reading the files is not an option, so I went straight for the ‘Problem.fig’ file.
I’m not certain that the contour lines aren’t plotting on the surface, however they appear to be the same colours as the surface, and that may be hiding them. One option is to make the surface slightly more transparent, and perhaps also to make the lines black (however the line colour does not appear to change) —
F = openfig(websave('Problem','https://www.mathworks.com/matlabcentral/answers/uploaded_files/1152063/Problem.fig'));
getF = get(F);
Ax = findobj(F, 'Type','Axes');
getAx = get(Ax);
Kids = Ax.Children
Kids(2).FaceAlpha = 0.75; % Necessary (Experiment With Different Values)
hc = Kids(1);
hc.LineWidth = 2; % Optional
hc.LineColor = 'k'; % Optional
I tried a few other experiments, however this is the only one that appears to work reliably.
.
8 Comments
Star Strider
on 11 Oct 2022
As always, my pleasure!
I wish there was a better (at least a more robust) solution.
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