How to generating surface without plotting?

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Daniel Chou
Daniel Chou el 30 de Dic. de 2020
Comentada: Daniel Chou el 30 de Dic. de 2020
I wonder if it's possible to create a surface by ''surf'' without plotting?
That means, I only want the surface data, but I don't want the figure.
Anyone has idea?
Thanks a lot and happy new year :)
  2 comentarios
Ameer Hamza
Ameer Hamza el 30 de Dic. de 2020
Can you explain what surface data are you referring to?
Daniel Chou
Daniel Chou el 30 de Dic. de 2020
Editada: Daniel Chou el 30 de Dic. de 2020
Sure!
For instance,
I would like to generate a surface of ellipsoid by
[x, y, z] = ellipsoid(3,3,5,1,0.5,0.5)
s=surf(x,y,z)
direction = [rand() rand() rand()];
rotate(s,direction,rand()*360)
Then use this surface to do further things
The plot of ellipsoid will be generated when I use ''surf'' command.
I just wanna know if it's possible to purely generate surface by surf without plotting it!
Thanks a lot!

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Ameer Hamza
Ameer Hamza el 30 de Dic. de 2020
Since it is a graphical object, you cannot create it without plotting somewhere. However, you can make the figure invisible so that it does not appear on screen
[x, y, z] = ellipsoid(3,3,5,1,0.5,0.5)
f = figure('Visible', 'off');
ax = axes(f);
s = surf(ax,x,y,z)
direction = [rand() rand() rand()];
rotate(s,direction,rand()*360)
  1 comentario
Daniel Chou
Daniel Chou el 30 de Dic. de 2020
I'll try this later.
Thanks for your patience and replying
Happy new year as well :)
Sincerely
Daniel

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Cris LaPierre
Cris LaPierre el 30 de Dic. de 2020
If I look at the first example on the surf documentation page, it first creates X, Y and Z, then uses surf to plot/create the surface. So is what you want X,Y and Z?
% Example modified to create surface data but not the surface
[X,Y] = meshgrid(1:0.5:10,1:20);
Z = sin(X) + cos(Y);
% surf(X,Y,Z)
  1 comentario
Daniel Chou
Daniel Chou el 30 de Dic. de 2020
Thanks for response
Actually I'm currently design a code to generate the ellipsoid inclusions in given space.
I try the build-in function of AlphaShape to detect overlapping, if the current ellipsoids are too close to each other, the current ellipsoid will be replaced by a new ellipsoid.
However, since I use the ''surf'' function to convert the ellipsoid [x,y,z] in to surface, the plot (from surf command) will be retained.
The output figure will look like a disaster.
Sincerely and happy new year!
Daniel

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