MATLAB: I am getting an empty triangulation for an existed data as shown below

DT =

delaunayTriangulation with properties:
              Points: [3307x3 double]
    ConnectivityList: []
         Constraints: []

Error using delaunayTriangulation/freeBoundary The triangulation is empty.

Best Answer

Please do not post new questions as a comment. The right place for a new question is a new thread.

The error "Undefined function ..." means, that the function cannot be found by Matlab. Save the function to a user defined folder and add the folder to Matlab's PATH, e.g. by addpath or pathtool. See the help for these commands, e.g.:

doc addpath

Hint: many newcomers get this error, such that a search in this forum or in the internet would reveal the solution soon.

Related Solutions

MATLAB: Divide a 3D shape into equal-volume subregions

Based on the comments, my original question was too open ended, so I am answering this to bring it to a close. A simple 3D division of the space inside the volume into cubes is good enough, something like,

load('seamount.mat', 'x', 'y', 'z'); % Generic data that comes with Matlab; contains 3D points
% Make the example shape less flat!
x = x*5000; 
y = y*8000; 
DT = delaunayTriangulation(x,y,z); % 3D triangulization of points
[C, volHull] = convexHull(DT); % Compute convex hull, which is cone-shaped
figure('Name', 'Convex Hull');  
hPatch = trisurf(C,DT.Points(:,1),DT.Points(:,2),DT.Points(:,3), ...
    'FaceAlpha', 0.1);
nCubesDesired = 100; 
cubeLength = range(z)/round(nCubesDesired^(1/3)); 
xGrid = min(x):cubeLength:max(x); 
yGrid = min(y):cubeLength:max(y);
zGrid = min(z):cubeLength:max(z);
% Loop through each cube and check if it is inside the volume using 
% in_polyhedreon from File Exchange
% https://www.mathworks.com/matlabcentral/fileexchange/48041-in_polyhedron
% If it is not inside the volume, throw the cube out.
set(gca, 'xtick', xGrid, 'ytick', yGrid, 'ztick', zGrid);
grid on;
% Iterate on cubeLength until you get the desired number of cubes

MATLAB: How to make delaunayTriangulation object from points and connectivity in 3D

You should use the function triangulation for this. Read about this.

https://in.mathworks.com/help/matlab/ref/triangulation.html

Best Answer

Related Solutions

MATLAB: Divide a 3D shape into equal-volume subregions

MATLAB: How to make delaunayTriangulation object from points and connectivity in 3D

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