matlab - Adjacency matrix from three-dimensional real world coordinates possible or nearest neighbour necessary? -

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problem statement

i have 3 dimensional coordinates point cloud , create adjacency matrix in order use:

http://www.mathworks.com/matlabcentral/fileexchange/12850-dijkstra-s-shortest-path-algorithm

problem definition

my coordinates stored in bm(40000x3) (columns:1=x, 2=y, 3=z). have seen questions in forum creating adjacency matrices two-dimensional coordinates, possible three-dimensions ? , yes me set-up algorithm?

or necessary use nearest neighbours knnsearch find adjacency? points equally spaced (x=5,y=1,z=5).


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