Hey guys,

How can we create custom rop nodes which work in dependency in out context of houdini?
Eg. I created a null node & added a button parameter to it. This button is linked to a python callback script.
I want this null node to work in dependency with other rop node.
So if I have geometry cache node on top, then this null node, then a mantra node. First the geometry node will cook, then this null's callback script should execute & then mantra node should start cooking.