Hey guys! Welcome to Houdini Houdono! Ronald here, and we’re diving into Season 2, Episode 3.

In this episode, I’ll show you how to use custom attributes to control your Vellum simulation—just like the effect you see on screen. This was a popular request on my Instagram, so if you’re curious about using custom attributes to drive simulations, this video is for you!

As always, I’m covering how to go from your native software to Houdini. Today, we’ll be importing Blender’s famous Suzanne model into Houdini and discussing some differences in the workflow. We’ll create a custom falloff attribute to drive both the simulation and the materials, giving you full control over how it all evolves.

Here’s what we’ll cover:
1. How to import models from Blender to Houdini.
2. Setting up a custom infection solver for falloff, using Pyro Source Spread.
3. Using the falloff attribute to drive the Vellum simulation and materials.

✨ Don’t forget! Head over to my Instagram post by 13 Oct and comment "Morph" to get the annotated working file for this setup. Can’t wait to see your renders! ✨

Instructor: Ronald Fong
Editor: Jasmine Seo