Visualise 3D trajectory data as a volume plot

Question

Impala 2018-7-26

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https://ww2.mathworks.cn/matlabcentral/answers/412230-visualise-3d-trajectory-data-as-a-volume-plot

评论： Impala 2018-7-27

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 2018-7-26

编辑：KSSV 2018-7-26

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 2018-7-26

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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Answer 1

KSSV 2018-7-26

3
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/412230-visualise-3d-trajectory-data-as-a-volume-plot#answer_330456

编辑：KSSV 2018-7-27

在 MATLAB Online 中打开

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:

https://in.mathworks.com/matlabcentral/fileexchange/26588-plot-circle-in-3d

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KSSV 2018-7-27

Edited the code...:)

Impala 2018-7-27

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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