I'm not sure if this is the right forum - please move the thread, if not - but, here goes... I have a collection of 3d coordinates, each with a radius of varying amounts. Each of the coordinates is to be linked to each of the others, unless a third coordinate - with its radius - blocks the straight line path between the first two. I'm thinking of an adjacency table where the intersection of the X, Y lines would be the length of an unbroken vector between the two points. Any ideas? Thanx in advance for any help!