One of the new features that rolled out along with Houdini 16, is the ability to have custom node shapes. This was part of the network editor redesign that also included alignment and layout tools, dot nodes and more.
how to create custom node shapes for Houdini 16.
You can quickly set node shapes by selecting a node and hitting S, and selecting one from the list. Adding node shapes to the network can make it much easier to see what is going on at a glance —Very useful for organizing really large node setups in Houdini. Did you know that you can create your own custom node shapes, instead of selecting from the stock list?
Simon Fiedler and Bastian Schiffer dug mourned to find a way. Watch Bastian Schiffer walk through the process for creating your very own custom node shapes for Houdini. It’s a bit of a complex process, but it might be worth it if you want to add your own spin on nodes in your favorite 3D app.