Creating an FX Production Shot in Houdini with Simon Littlejohn

Follow along as FX Supervisor, Simon Littlejohn, creates a series of effects using Houdini and Nuke, from bone-crushing tendrils to a slimy tentacle attack. Simon approaches the workshop as the creation of a complete shot, from start to finish, revealing his processes and techniques along the way.

With over a decade of industry experience, Simon walks through his tried-and-trusted methods for procedurally generating curves using for-loops, and shows how to attach those curves to any animated character using simple yet powerful VEX. From there, he instructs how to “grow” those curves over time in visually interesting patterns, and ultimately create high-fidelity 3D geometry from them. The second technique in this workshop details how to create a slime trail left behind as the tendrils take over the character’s body. Simon shares how to create this highly controllable effect without the need for FLIP simulation, which can often be expensive and unpredictable.

The following effect focuses on shooting webbed tendrils from the character’s body and attaching them to his surrounding environment. Simon explains how to create constraints using simple VEX, and run animated curves through a vellum simulation to aid in the realism of the effect. Additionally, you will discover how to create highly detailed webbing patterns that follow the animation of your curves. For the final effect, Simon revisits all the techniques covered to create a tentacle that bursts from the character’s hand, firing directly into the camera.

Each effect demonstrated in this workshop is highly adaptable, and can be repurposed for a wide variety of needs. In the final segment of the tutorial, Simon discusses how to shade and render the effects, and offers his final thoughts as well as a review of the final render.

The downloadable resources provided with this workshop include the Houdini project and character files.

01. Introduction 02. Houdini Workspace Setup 03. Scene Setup and Character Preparation 04. For Loops and Find Shortest Path 05. Curve Color and Attaching to the Animated Body 06. Growing the Curves Using VEX 07. Shaping Coloring and Meshing the Curves 08. Shape Variation With the Solver SOP 09. Creating a Goop Trail With Solver SOPs 10. Building and Animating Webbing Part 1 11. Building and Animating Webbing Part 2 12. Wire Simulation in Vellum 13. Creating Spiraled Geometry from Wires 14. Making Connective Knots for Wire Geo 15. Shooting Tendrils Toward Cam 16. Final Tweaks, Final Render and Closing Thoughts SLI01_projectFile_T.7z [Gnomon] Creating an FX Production Shot in Houdini with Simon Littlejohn_Subtitles.7z

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