projection of 3D plot onto 2D.

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Kwame Atta Gyamfi
Kwame Atta Gyamfi 2019-10-6
评论： Star Strider 2019-10-6
Dear all,
saved1.png
Dear all,
Above is a 3D plot of a data and a line plot(white). The line plot starts from x=-0.2 and proceeds in a peicewise linear way up. However, as shown above, the lower part of this line is hidden. Possibly overshadowed by the 3D color graph.
My desired output is to show the full shape(or lenght) of the while line above the color map. Below is the code I used for the above plot.
figure(5);
clf
[xx,yy] = meshgrid(gridX,time_t);
HH = mesh(xx,yy,U);
view([0 90])
hold on
%for the white line
plot(xi_t,time_t, 'w', 'linewidth', 1.9);
ylabel('t')
xlabel('x')
colorbar
hold off
How do I solve this problem? Someone help me please. I have looked up and tried suggesstions on how to project a 3D figure onto 2D surface but to no avail.
THanks in advance

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采纳的回答

Star Strider
Star Strider 2019-10-6
You can change the transparency ('FaceAlpha') of the surf plot. The problem is that the line is white, so even with a very low 'FaceAlpha' value, it will not be visible. I would reduce the 'FaceAlpha' value, and make the line a colour that will contrast sufficiently with the surf plot to be visible beneath it.
Experiment with this:
[X,Y] = meshgrid(-1:0.01:1);
Z = X.^3 + sin(Y*2*pi);
figure
HH = surf(X, Y, Z);
HH.FaceAlpha = 0.3;
hold on
plot((1:20)/20, rand(1,20)*2-1, 'r', 'LineWidth',1.9)
hold off
shading('interp')
% view(0, 90)
  2 个评论
Kwame Atta Gyamfi
Kwame Atta Gyamfi 2019-10-6
Thanks it worked. I can see patches of the peicewise line at the bottom if FaceAlpha = 0.8. It appears there's a compromize on the quality of the color map though.
Star Strider
Star Strider 2019-10-6
As always, my pleasure.
There are always trade-offs. Experiment with the colormap and caxis functions to see if it’s possible to get a better result.

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