In this VFX shot workshop, Simon Littlejohn introduces his background as a professional VFX artist and outlines the series. Covering everything from basic curve growth to complex tentacle shots, he provides a comprehensive workflow for creating realistic, unsettling organic effects at a production-level standard. The lessons are aimed at artists seeking to advance their skills in creature effects and procedural animation techniques.

Duration: 43s

In this first lesson, Simon walks through his workspace setup and personal preferences within Houdini. A key focus is the geometry spreadsheet and the importance of keeping it visible, as monitoring parameter changes in real time is critical for effective effects work. With this setup in place, the workshop is ready to move into production-focused topics.

Duration: 1m 27s

Simon establishes the foundational setup for procedural tendril growth on a character. By converting the character into a unified, properly triangulated mesh and defining start and end regions through painted attributes, the geometry is prepared for algorithmic path-finding that generates organic-looking tendrils extending from the feet to the extremities. The lesson concludes by outlining the transition to implementing the growth system using for-loops.

Duration: 8m 36s

This lesson showcases Simon’s workflow for creating complex, organic structures on character models using iteration-based randomization. By combining for-loops with noise-based pathing and defined start and end points, the system generates varied, natural-looking tendrils that avoid repetitive or overlapping patterns. The modular setup allows for quick adjustments to coverage and density through simple mask painting and iteration count changes, making it a flexible solution for adding procedural detail to 3D models.

Duration: 13m 27s

In this lesson, Simon presents a comprehensive workflow for dynamically modifying curve-based elements attached to animated geometry in Houdini. By combining randomized color attributes, animated noise, and UV-based attachment points, a sophisticated system is created in which curves maintain their surface relationship to the character mesh while exhibiting individual variation in thickness and movement. This technique is particularly effective for organic effects such as hair or tentacles that must follow deforming geometry.

Duration: 13m 8s

Simon discusses methods for animating growing curves, including approaches that offer significantly more control than other techniques. By leveraging VEX code, UV attributes, and randomization, his preferred workflow enables natural-looking, staggered growth with customizable timing variation and animation easing. Emphasis on cleaning up geometry and maintaining consistent point counts reflects professional pipeline practices that help prevent issues in downstream meshing operations.

Duration: 15m 58s

In this lesson, Simon demonstrates the creation of organic, animated tendrils by combining curve growth, careful attribute management, and VDB conversion techniques. Achieving natural-looking results relies on layering size, color, and timing variation while using VDB reshaping to simulate surface tension. Simon’s approach to testing and adjusting thickness distribution ensures the final effect maintains clear visual hierarchy, with smaller tendrils visible beneath larger ones.

Duration: 15m 24s

Simon now presents a procedural system for adjusting and animating the tendrils, adding growth and pulsation effects. The workflow demonstrates advanced Houdini techniques, including solver SOPs for data accumulation, attribute manipulation for coordinated animation, and VDB conversion for the final result. The effect produces visually rich, irregular organic forms that grow along curves while maintaining temporal coherence and adding secondary pulsating motion.

Duration: 34m 24s

In this lesson, Simon showcases a fully procedural approach to creating organic slime or goop effects without relying on full physics simulations, allowing for greater artistic control and faster iteration. By using solvers for data persistence, attribute transfers for spatial relationships, and VDB operations for mesh generation, convincing effects are created that appear physically based and travel with the character. The workflow emphasizes the importance of subframe data for smooth motion and demonstrates how layering simple operations can produce complex, believable results suitable for production.

Duration: 22m 16s

This lesson examines how artists can create an organic web effect that dynamically connects a character to the surrounding environment. A key innovation at this stage involves using custom radial normals and frozen raycast positions to maintain visual stability while allowing the character to move. By combining careful attribute management, UV-based animation controls, and randomized growth parameters, the technique produces believable partial web tendrils that form the foundation for more complex secondary webbing geometry in subsequent lessons.

Duration: 24m

Simon covers the technical elements involved in creating organic, web-like tendrils by building a system of branching curves with randomized, staggered growth patterns. While the result is visually compelling, it is emphasized that this stage represents preparatory geometry rather than a finished effect. The structure serves as the foundation for a Vellum simulation, which adds realistic physics and dynamic behavior to produce the final result.

Duration: 17m 32s

In this lesson, Simon demonstrates the process of creating realistic wire simulations attached to an animated character using Houdini’s Vellum solver. Success depends on properly defining which points follow the base animation and which are simulated, then fine-tuning physical properties to achieve the desired look. The lesson concludes by outlining how these simulated curves are prepared for shaping into final renderable geometry.

Duration: 9m 41s

In this lesson, Simon presents a procedural approach to creating realistic spider web geometry that conforms accurately to surfaces while maintaining organic variation. By using multiple attribute systems, including UV ramps, color masks, normals, and connectivity, different aspects of the geometry are controlled independently, preserving both artistic control and technical precision. The techniques demonstrated extend beyond web creation and apply to any scenario involving twisted, varied curves that must conform to complex surfaces with specific attachment and blending behavior.

Duration: 24m 4s

Simon now covers Houdini techniques for creating detailed connective tissue geometry between curves, emphasizing the importance of proper data flow and attribute management throughout the node network. The workflow demonstrates how mathematical precision, combined with procedural noise and randomization, can produce organic-looking technical structures. The resulting geometry maintains visual continuity while preserving the flexibility to adjust parameters procedurally before final caching.

Duration: 17m 38s

In this lesson, Simon presents a workflow for creating a final animated tendril with realistic variation and motion, directed toward the shot camera. Success comes from layering multiple techniques, including proper curve setup, noise application, VDB smoothing, and careful attribute management. The result is a visually compelling effect, with tendrils shooting dynamically from the character’s hands toward the camera.

Duration: 27m 36s

In this final lesson, Simon shares practical production decisions commonly seen in VFX work, emphasizing efficiency over complexity. His refinement choices, including the use of simpler shaders, rendering in Mantra instead of Karma, and strategic render optimizations, highlight the importance of balancing quality with render time constraints, particularly for solo artists. The techniques demonstrated for velocity transfer, procedural growth effects, and rendering optimization are applicable across a wide range of VFX scenarios, including fluid simulations, volumes, and rigid body dynamics.

Duration: 12m 35s