The Babylon Toolkit: V5.0.0-A31 will support (Still Working Out The Kinks) the Houdini Engine Plugin For Unity Out-The-Box
Houdini Engine for Unity lets you bring procedural node-based assets into the Unity editor. These assets contain “recipes” that can be applied many times in multiple levels to create consistent, high quality game art.
Simple Unity Project With Houdini Engine Plugin
Babylon Export Using Houdini Vertex Color Shader Configuration