Houdini Tutorial - optical Flow with Flip Tank

Hi everyone. In this tutorial, we are going to learn how to use optical flow to control our fluid simulation. This technic can be used in different simulations like particles, fluids or smoke. I want to say this tutorial is a follow up from the original one from Mark Fancher. Big thanks to him for making his awesome video about optical flow, where he is emitting fluids from the footage and using optical flow to control its velocity. On this tutorial, we are going to explore a similar workflow but inste