Grasshopper PointGroups RhinoCommon equivalent

Rhino Developer
,
1

Hi,

Is there any RhinoCommon function similar to the ‘PointGroups’ component in grasshopper, or it needs to be written from scratch?

image

Thanks in advance for your help!

2

I don’t think so? :thinking: but you could use Node in Code to achieve that.

cheers.

3

Hi Bob,

Thanks! I didn’t knew this.
But as I’m using RhinoCommon via a C# plugin, I won’t have access to this feature :frowning:

4

Oh I think It’s totally possible in C# you’ll just use the Rhino.NodeInCode namespace and it’s a little different implementation. Check out this post: Using the NodeInCode namespace

5

Hi, not fully tested but does this do what you’re looking for?

using System;
using System.Collections.Generic;
using System.Linq;
using Rhino.Geometry;

Func<List<Point3d>, double, List<List<Point3d>>> point_groups = (pts, minDist) => {
    var pointGroups = new List<List<Point3d>>();
    List<Point3d> lonePoints = pts;

    bool repeatLoop = true;
    while (lonePoints.Count > 0) {
        var inRangeGroup = new List<Point3d>{lonePoints.First()};
        lonePoints = lonePoints.Skip(1).ToList();
        while (lonePoints.Count > 0 && repeatLoop) {
            repeatLoop = false;
            var tooFarGroup = new List<Point3d>();
            foreach(var lp in lonePoints) {
                if (inRangeGroup.Any(p => p.DistanceTo(lp) <= minDist)) {
                    inRangeGroup.Add(lp);
                    repeatLoop = true;
                }
                else
                    tooFarGroup.Add(lp);
            }
            lonePoints = tooFarGroup;
        }
        pointGroups.Add(inRangeGroup);
        repeatLoop = true;
    }
    return pointGroups;
};

G = point_groups(P.ToList(), D);
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