Visualise 3D trajectory data as a volume plot

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Impala il 26 Lug 2018
Commentato: Impala il 27 Lug 2018
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.
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KSSV il 26 Lug 2018
Modificato: KSSV il 26 Lug 2018
Huumhh..it looks complex for me.....Do you need to remove some points? There is difference in the line plot and the plot you wanted..
Impala il 26 Lug 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.

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KSSV il 26 Lug 2018
Modificato: KSSV il 27 Lug 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)) ;
figure
hold on
plot3(x,y,z,'r')
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,:);
end
h = mesh(Cx,Cy,Cz) ; shading interp
h.FaceAlpha = 0.5 ;
Download the functions from the link:
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KSSV il 27 Lug 2018
Edited the code...:)
Impala il 27 Lug 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.

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