Apparent distance conservation in Matlab plot window while rotating 3D objects

Question

Nicolas Douillet 2023-8-12

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https://ww2.mathworks.cn/matlabcentral/answers/2007762-apparent-distance-conservation-in-matlab-plot-window-while-rotating-3d-objects

移动：Bruno Luong 2023-8-16

Hey,

When you plot a 3D object in Matlab and turn it around the apparent distance to this object will change, even if you set axis equal first for instance.

As far as I know, this has always been so, and still is (though my version is 2019b, not the latest one).

Would you please know a way, an other option to set, to make them static ?

Thank you

Best,

Nicolas

Edit : by the way, do you know an option to change/tune the field of view of the camera ?

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Bruno Luong 2023-8-13

在 MATLAB Online 中打开

Turn on the cameratoobar, and the rotation with this tool might also meets your reques) of constant distance?

figure
surf(peaks(40))
cameratolbar

Nicolas Douillet 2023-8-16

移动：Bruno Luong 2023-8-16

Ok I realized I have to be even clearer.

I am going to eplore the camera toolbar possibilities -which I didn't really know until now- and then come back here -with a relevant example if possible- if necessary. Thank you for your comments and answers.

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Answer 1

John D'Errico 2023-8-12

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https://ww2.mathworks.cn/matlabcentral/answers/2007762-apparent-distance-conservation-in-matlab-plot-window-while-rotating-3d-objects#answer_1286787

在 MATLAB Online 中打开

I'm confused. If you plot two things in 3-d, you change the view using the function view.

But OF COURSE things change when you rotate the axes.

x = [1;3];

y = [2;8];

z = [0;5];

plot3(x,y,z,'-o')

axis equal

% the default view

[az,el] = view

az = -37.5000

el = 30

% new figure

plot3(x,y,z,'-o')

axis equal

view(-20,-39)

And in the second, the two points appear now virtually next to each other. So you would expect the apparent distance to change, as a function of the perspective. I could have set them dead on, so the two points would be on top of each other too.

So what do you think is wrong in this?