Now I am trying to set some control for rigging a character with a few nulls. Does anyone know how I can set some translation limit for the null?(e.g. maxValue =3, minValue =-3) I tried to edit the parameter interface but I could not have done it successfully.

In the previous version of Houdini, I remember that there were a function called subnetwork. It is for simplfy a complicated network. But I cannot find it in Houdini 9.1 Does anyone know how we could simplfy a complicated network in Houdini 9.1

Any help will be appreciated! thanks!

Select nodes for subnetwork then SHIFT + C.

I really think the thing stopping this from making sense is the fact that it's not available when right clicking on the selected nodes … you have to right click outside of the selected nodes to “collapse” that selection.

Does anyone know how I can set some translation limit for the null?(e.g. maxValue =3, minValue =-3)

Does the “lock” on the parameter controls work?

If you have animation in your parameter clamp will work (LMB click on parameter to switch between value/function).

clamp(bezier(),-3,3)

Unfortunately you can only do this once you have keyed the parameter. If there's no animation data this will not work.

If the parameter is promoted to top level of digital asset you can set limits on it in the type properties window using the ‘range’ toggle.