How do you rotate an ellispoid?

1 view (last 30 days)
Ali Almakhmari
Ali Almakhmari on 19 Jul 2022
Edited: Ali Almakhmari on 19 Jul 2022
So I have an ellispoid plotted in MATLAB. And I want to make an animation of this ellipsoid being rotated around its center with a certain speed. And possibly even save this animation as a gif or something. Is this possible? And how can I do it?

Accepted Answer

KSSV
KSSV on 19 Jul 2022
Proceed something like this:
xc=50; %xCenter
yc=50; %yCenter
a=25; %xRad
b=100; %yRad
m = 1000;
theta = linspace(0,2*pi,m)';
x = a * cos(theta);
y = b * sin(theta);
alpha = linspace(0,2*pi) ;
figure(1)
filename = 'test.gif';
for i = 1:100
R = [cos(alpha(i)) -sin(alpha(i)); ...
sin(alpha(i)) cos(alpha(i))];
rCoords = R*[x' ; y'];
xr = rCoords(1,:)';
yr = rCoords(2,:)';
plot(xc+xr,yc+yr,'b');
drawnow
frame = getframe(1);
im = frame2im(frame);
[imind,cm] = rgb2ind(im,256);
if i == 1
imwrite(imind,cm,filename,'gif', 'Loopcount',inf);
else
imwrite(imind,cm,filename,'gif','WriteMode','append');
end
end
  1 Comment
Ali Almakhmari
Ali Almakhmari on 19 Jul 2022
Edited: Ali Almakhmari on 19 Jul 2022
This is really good! However, this rotates an ellipse and not elliposid (an ellipsoid is an ellipse in 3D). Can you somehow make it work for an ellispoid?
Edit: Nevermind. I easily replaced few lines in the loop with the rotate command and it worked. Thanks!

Sign in to comment.

More Answers (1)

Matt J
Matt J on 19 Jul 2022
Use rotate.

Categories

Find more on Animation in Help Center and File Exchange

Products


Release

R2022a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by