MATLAB Answers

Trajectory animation using coordinate points

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Tomer
Tomer on 30 Aug 2019
Edited: David K. on 3 Sep 2019
I have set of x, y and z coordinates of two objects and I want to create animation of the object's 3D trajectory/motion using these coordinates. Consider the first coordinate in the set as the initial position. Can anyone help me with this.

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Accepted Answer

darova
darova on 1 Sep 2019
Animation it is just changing of images like in cartoons
plot(x,y,z)
hold on
for i = 1:length(x)
h = plot(x(i),y(i),z(i),'^r'); % draw something on the trajectory
pause(0.2) % wait a minute
delete(h) % delete it
end
hold off

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More Answers (1)

David K.
David K. on 30 Aug 2019
Edited: David K. on 3 Sep 2019
I would do it like this:
% x1,x2,y1,y2,z1,z2 are your coordinate vectors
tstep = .1; % the amount of time between each value in the vectors
figure(1)
for n = 1:length(x1)
plot3(x1(1:n),y1(1:n),z1(1:n),'+-',x2(1:n),y2(1:n),z2(1:n),'+-')
title((n-1)*tstep); % label the time of each step
pause(.01)
end
If the default view of the plot is bad mess around with the view function to try and get a better one.
This will make an animation with both, to make the other two animations simply repeat it and leave out the xyz coordinates of the one you do not want to look at.
edit: fixed so it should actually work now

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darova
darova on 31 Aug 2019
Can you please show something? Did you try something?
Tomer
Tomer on 1 Sep 2019
See, the attachment
tstep = .1; % the amount of time between each value in the vectors
figure(1)
for n = 1:length(x)
plot3(x,y,z,'+-')
title((n-1)*tstep); % label the time of each step
pause(.01)
end
I could see only the plot but, not the animation video.
David K.
David K. on 3 Sep 2019
Oh woops the plot3 should actually be this, i've also updated my original answer with it.
plot3(x(1:n),y(1:n),z(1:n),'+-')
Then, the axis will auto update as the values are added. If you do not want the line change '+-' to '+'
You also may need to add this to it to hold the axis positions.
xlim([lowX upX]);ylim([lowY upY]);zlim([lowZ upZ]);

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