This tutorial will show how to set up a complex Particle Flow system to make a tornado inside of 3ds Max. Going beyond a traditional vortex field, the tornado that we'll create in this tutorial will employ recursive logic to keep the system alive while still being lightweight enough to be animatable inside the viewport. We will then look at getting much more natural movement by simulating FumeFX based off of the particle simulation. We'll also touch on Krakatoa and using that to render a large number of particles. Partitioning will be covered along with some of the rendering options available. Finally, we'll look at some techniques to fix artifacts in NUKE.