I wanted to make a little IK node to use in sops to give things lots of legs.
Houdini 17.5 got a bunch of cool new vex functions like solveik() – these work like the agent solveik and agentsolvefbik and just process a joint chain and give you new angles. Pretty handy. http://www.sidefx.com/docs/houdini/vex/functions/solveik.html