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One of the best things about Houdini is the simplicity of creating explosions. This tutorial will go over the steps required to create, shade, and render great looking explosions in Houdini using RenderMan.
The first step is to get RenderMan setup work with Houdini. This video gives a great initial introduction to the initial setup for RenderMan for Houdini.
After getting started, you will want to create a torus, upon which we will add a Fireball pyro effect. You can add a torus, by hitting TAB in the Scene View and type out "Torus".