how to set a threshold for delauneyTriangulation?

Hi there, I am trying to triangulate a set of points in 3D with delauneyTriangulation() and visualise it using tetramesh(), but I've got a graph which connects every input points I feed in. However, I just want edges, say, below a certain threshold, so not all points connected to all points, but only those are close enough. Is there a way doing that? Thanks!

[Swaroop Mishra]

Have you gone through this example ?