How to view the entire 3D object in XY plane and access the values from it

I have 3 ellipsoids that I have created using the ellisoid function. I need to view the ellipsoid in XY and XZ axis and access the values of all the 3 ellipse for some other calculation. I am familar with the view function, but how could I access the values from it. Can somebody help / suggest how could I calulate it in matlab?

Thanks,

[Varsha Radhakrishnan]

Hi @Matt J: Can I apply a similar technique here as in the below link:

https://uk.mathworks.com/matlabcentral/answers/805926-making-a-2d-image-from-3d-shape

Could you please help me to sort it out?

Thanks

Answer 1

[darova]

Try rotate

[x,y,z] = ellipsoid();
h = surf(x,y,z);
rotate(h,angle,dir,origin)
z1 = get(h,'zdata');

[Varsha Radhakrishnan]

Hi @darova,

I didn't get you clearly. If I use view(0,0) and view(0,90) I can get my whole surface in XY and XZ plane, But how can I access the data from view to calculate the major and minor axis of ellipse? is that possible?

Thanks

[darova]

I dont'' understand. view() function doesn't return any data. I thought you want some after rotation. Isn't it?

[Varsha Radhakrishnan]

Hi @darova,

Thanks for the message. What I was looking for is to view the ellipsoids in XY and XZ plane so as to get an ellipse and then find their major and minor axis. I hope the question is clear now.

Thanks,

[darova]

No, it's not. I still don't understand. Are you asking how to manipulate using view() or what?

[Varsha Radhakrishnan]

No its not I was just saying view as an example..

I was trying it out and could you tell me if this is right? Can I find the major/minor axis values of ellipse by using Maxis =max(x)-min(x); and max(y)-min(y)? if wrong, is there any way to find it?

e=[4.00e-04 -0.0015 -1.5000;      %a,b,c values of ellipsoid
  -7.00e-04 8.00e-04 0.6667];
ec=[71.0561 -129.2695 7.7346;     %Ellipsoid centres
   71.0576 -129.2728 1.3333];

function getEllXY(e,ec) %Get ellipsoid in XY plane (Ellipse)
f2=figure;
t=linspace(0,2*pi);
    for k=1:numel(e(:,1))
    x=e(k,1)*cos(t)+ec(k,1);
    y=e(k,2)*sin(t)+ec(k,2);
    plot(x,y,'r');                  %Plot ellipse
    hold on;
    end
end

[darova]

• Can I find the major/minor axis values of ellipse by using Maxis =max(x)-min(x); and max(y)-min(y)? if wrong, is there any way to find it?

If the axes horizontal or vertical then answer is YES. But if the ellises will be rotated at some angle then answer is NO

[Varsha Radhakrishnan]

Thats great. Thanks @darova

[darova]

im jsut doing my job