Connect near points with polyline in Houdini Vex with user-defined radius and max point count.

hou_connectNearPts.h

// Set Wrangle to 'Run Over Points'.

// Collect closest pts for each pt, based on radius and max pts.
// Includes user-managed channels for radius and max pts.
// Note that this list will include the current point being run
// through this point wrangle.
int pts[] = pcfind(0,"P",@P,chf('search_radius'),chi('max_points'));

// Used to visualize list in geo spreadsheet; for debugging.
i[]@pts = pts;

// Iterate through each collected pt.
foreach(int pt;pts){
    // Process only those pts in list that are not the current pt.
    if (pt != @ptnum) {
        // Connect each pt in list to the current pt with a polyline.
        addprim(0,"polyline",@ptnum,pt);  
    }
}