Houdini Spring Constraint
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How to do a quick set on a spring constraint with RBD.
here is the point wrangle vex code (why type if you can copy and paste:)
vector anchor = pointattrib(1, "P", 0, 0);
int point = addpoint(geoself(), anchor);
int prim = addprim(geoself(), "polyline");
int vert01 = addvertex(geoself(), prim, point);
int vert02 = addvertex(geoself(), prim, @ptnum);