vecmath | Fork of the javax.vecmath package

I have a load of vecmath Point objects (Point3d FWIM) which I would like to “group” based on the distance between them. I can probably write the code for this from scratch (I’ve done similar tasks in excel), but I like the idea of using existing libraries where possible. The problem is I can’t find any libraries like this.

I haven’t thought through the exact algorithm fully, but I hope I’ve done enough for the question not to be deleted. Please bear with me, I'm still new here at the time of this post.

I imagine the grouping would work as follows:

1. decide the distanceLimit
2. loop 1: for each Point, calculate the distance to each other Point
3. Make a "Set"

4. loop 2: for each Point

   • if the next Point is within the distanceLimit of any previously considered Points up to i, add it to current "Set"

   • Else make a new "Set".

Edit: ah the power of verbalising one's ideas. The above doesn't the capture the situation where points 1 and 2 are between one and two distanceLimits apart and initiate separate "sets", and point 3 crops up halfway between them meaning that all three should be in one set really. Need to think about this some more!

I’m also not sure yet what data structures I should really use for the input and output (ArrayLists? Sets?). Ideally I am looking for an existing library that does this or similar; if you’re confident there isn’t one, then any suggestions for the algorithm or the actual code would be more than welcome.

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