Hi all, first time joining RTVFX community art night. 
Big thanks to Manus for encouraging me to post the work with breakdown instead (since I finished it without making a thread and post my process here)
Here’s the finished looping tornado
Things I want to include in my breakdown post
- Seperate element of effect
- Tornado mesh in Houdini
- Tornado’s main body’s shader
-3.1. Issue with Fresnel on Up Axis (and what I did)