Clear Filters
Clear Filters

Visualise 3D trajectory data as a volume plot

8 views (last 30 days)
I have 3D trajectory data (x, y, z coordinates) which I would like to visualise as a volume plot. I'm using plot3 but just getting a line plot - see attached pdf with images of what I'm getting using plot3 and what I would like to get.
I've also attached a .mat file containing my 3D-trajectory data.
Many thanks for your help.
KSSV on 26 Jul 2018
Edited: KSSV on 26 Jul 2018 looks complex for me.....Do you need to remove some points? There is difference in the line plot and the plot you wanted..
Impala on 26 Jul 2018
Yes, points can be removed - its just for visualisation purposes.
I have read posts on similar topics but haven't been successful so far. I'm getting stuck on the bit where I need to transform my 3D trajectory data into a form that the matlab volume visualisation tools can use as inputs.

Sign in to comment.

Accepted Answer

KSSV on 26 Jul 2018
Edited: KSSV on 27 Jul 2018
Check the below trial code:
S = matfile('C:\Users\srinivas\Downloads\3DTraj.mat') ;
x = S.xSmooth ;
y = S.ySmooth ;
z = S.zSmooth ;
x = x(1:5:end) ; y = y(1:5:end) ; z = z(1:5:end) ;
N = [diff(x) diff(y) diff(z)] ;
C = 20*ones(size(x)) ;
hold on
Cx = zeros([],[]) ;
Cy = zeros([],[]) ;
Cz = zeros([],[]) ;
for i = 1:1:length(x)-1
center = [x(i) y(i) z(i)] ;
normal = [N(i,1) N(i,2) N(i,3)] ;
radius = C(i) ;
P = plotCircle3D(center,normal,radius) ;
Cx(i,:) = P(1,:);
Cy(i,:) = P(2,:);
Cz(i,:) = P(3,:);
h = mesh(Cx,Cy,Cz) ; shading interp
h.FaceAlpha = 0.5 ;
Download the functions from the link:
Impala on 27 Jul 2018
This works really well :) thank you so much! One last question - how do I get it to be the same colour throughout and also a little transparent so I can see the line plot through it? I've tried modifying the h.FaceColor and h.FaceAlpha values but it's not doing anything.

Sign in to comment.

More Answers (0)

Community Treasure Hunt

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

Start Hunting!