Tomas Slancik

If you want to procedurally define key positions and values use spline() [www.sidefx.com] or ramp_lookup() [www.sidefx.com] function

You can likely also just multiply sin() and -exp() functions for similar shape without having to sample any ramp

You can probably register node event callback [www.sidefx.com] for each HDA instance to handle hou.nodeEventType.ParmTupleChanged

You likely want to add it during HDA's OnLoaded callback as the node event callbacks don't persist between sessions

likely because you don't have UVs on the remeshed geo since displacement map relies on that

you may have some luck with Labs UV Transfer to transfer vertex uv attribute from original geo to remeshed geo

or alternatively you can create new UVs and bake the new displacement map