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Workshop

Snow Simulation Workflows in Houdini

A Workshop
by Diego de Mendizabal

Vellum Simulation Techniques with Diego de Mendizabal

intermediate
6h 5m 40s
9 Lessons
A Workshop
by Diego de Mendizabal
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Learn how to use Vellum in Houdini to simulate professional-quality snow interactions. This 6-hour workshop is created for intermediate-level artists looking to expand their FX skills. Diego de Mendizabal, a Lead/Senior FX TD at Sony Pictures Imageworks, demonstrates how to use Vellum to simulate snow and shares Pyro and POP tips and tricks for generating secondaries, and briefly touches on Solaris, Karma, and Houdini's own compositing tools for shading and rendering snow. 


Artists will learn tips and techniques to art-direct snow simulations using constraints and attributes.
By completing the workshop, artists will develop a solid grasp of how to use Vellum and its tools to create snow/mud/sand simulations with an iterative, art-directable approach. Diego also talks through typical problems that artists may encounter, how to troubleshoot and solve them, and ways to optimize the setup for minimal data and simulation time footprints. 


In the second half of the workshop, Diego teaches how to set up and add secondary elements to the main simulation to enhance its appearance and gain more control over it. He then covers how to shade and render these elements in Houdini's lighting toolkit, Solaris, as well as how to set up Karma renders and use its live viewport rendering capabilities.

To make this workshop easily accessible to artists, everything is built in Houdini, including all assets used (minus the featured free-to-use .hdr light probes), so there will be no need to use other content creation packages or download separate models and files. Project files for this workshop are provided by Diego as an additional learning resource.

9 Lessons

01Reference Gathering for Snow SimulationsFree

This first lesson in Diego de Mendizabal's workshop discusses the critical importance of studying real-world references before attempting to recreate natural phenomena in VFX. Diego demonstrates how convincing snow simulation requires understanding and replicating multiple simultaneous behaviors, from fine particulate matter to cohesive chunks, rather than treating snow as a single uniform material. This foundational analysis will be helpful when tackling the technical setup in the following lessons.

Duration: 13m 4s

Reference Gathering for Snow Simulations
02Terrain, Collisions & Snow Source Setup

This foundational lesson establishes key production practices for building professional VFX setups in Houdini. Diego demonstrates why successful simulation work relies heavily on proper preparation, organization, and workflow design rather than technical knowledge alone. By emphasizing naming conventions, modular design, and art-directable parameters, this lesson prepares artists for real-world production environments where setups must be maintained and used by multiple team members over extended periods.

Duration: 38m 50s

Terrain, Collisions & Snow Source Setup
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03Main Snow Simulation Setup: Part 1

This lesson explores the foundation for a sophisticated Vellum grain snow simulation by showing how to properly set up point sources, collision geometry, and layered physical properties. Diego emphasizes how to break complex effects into manageable components and use optimization strategies to efficiently handle heavy geometry calculations. His systematic approach creates a solid base for developing realistic snow interactions with characters and environments.

Duration: 52m 33s

Main Snow Simulation Setup: Part 1
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04Main Snow Simulation Setup: Part 2

This lesson covers a foundational workflow for creating Vellum grain simulations in Houdini, showcasing the importance of proper solver configuration and collision setup. Diego explains why many Vellum parameters are sensitive and can cause simulations to explode if pushed too far, making conservative adjustments and thorough testing essential. The next steps will involve low-resolution testing and increasing the complexity of the simulation setup.

Duration: 29m 15s

Main Snow Simulation Setup: Part 2
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05Main Snow Simulation Setup: Part 3

This lesson demonstrates a systematic approach to creating realistic snow simulations in Houdini, emphasizing the importance of proper constraint setup and troubleshooting techniques. Diego shows how to build from basic particle systems to complex clustered behavior that mimics real snow's tendency to form chunks while maintaining the ability to break apart under force. His workflow provides a solid foundation for creating believable snow effects that can be scaled up for production-quality results.

Duration: 45m 1s

Main Snow Simulation Setup: Part 3
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06Secondary Simulations Setup: Part 1

This lesson discusses the importance of proper preparation and optimization when creating secondary simulations in Houdini. Diego explains why investing time in creating high-quality source volumes and in understanding the relationship between particle data and volume fields will yield more realistic dust effects and reduce troubleshooting later in the process. His approach of starting with lower resolution settings and gradually increasing detail provides a practical workflow for production environments.

Duration: 31m 48s

Secondary Simulations Setup: Part 1
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07Secondary Simulations Setup: Part 2

This lesson demonstrates a practical, production-oriented approach to creating secondary dust and particle effects in Houdini. Diego emphasizes the importance of understanding parameter relationships through experimentation rather than simply copying values, and provides essential optimization techniques to manage the computational demands of volume and particle simulations. His workflow establishes a solid foundation for creating realistic environmental effects that can be scaled up for final production renders.

Duration: 43m 46s

Secondary Simulations Setup: Part 2
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08Solaris & Karma

This comprehensive lesson establishes a robust foundation for rendering realistic snow simulations in Houdini. The volumetric approach, combined with gradient fields and real-time GPU rendering, creates an efficient workflow that balances visual quality with performance. Diego emphasizes the importance of proper volume limits and lighting setup to achieve bright, convincing snow while maintaining reasonable render times, setting up the groundwork for the next lesson on AOV setup and compositing.

Duration: 1h 14m 24s

Solaris & Karma
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09Compositing the Final Image

This final lesson provides an overview of render-layer workflows in Karma, demonstrating how breaking down renders into component passes enables significantly greater control in post-production. While the concepts shown are fundamental, Diego emphasizes that these techniques can be applied across different compositing packages and encourages experimentation to develop personalized workflows. His combination of a proper AOV setup and thoughtful compositing opens up creative possibilities beyond what's achievable with a single beauty pass.

Duration: 36m 59s

Compositing the Final Image
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Primary tools

For this workshop you’ll need:

Houdini

* Note that these programs and materials will not be supplied with the course.

Skills Covered

Who’s this Workshop for?

This workshop is designed for intermediate-level FX artists and technical directors who want to expand their simulation skills and knowledge using Houdini. It's ideal for professionals in VFX, animation, or game development with basic Houdini knowledge who want to master professional snow-simulation techniques.


Junior artists looking to advance their FX capabilities will also benefit significantly from Diego's comprehensive training. His workshop provides valuable insights into industry-standard workflows, troubleshooting methods, and optimization techniques that are essential for production environments, making it ideal for anyone seeking to enhance their technical artistry skills.

Learning Outcomes

By completing this workshop, artists will have developed a comprehensive understanding of Vellum-based snow simulations and professional FX workflows in Houdini.


Key skills include:

  • How to set up and configure Vellum systems in Houdini for realistic snow simulation FX.
  • How to art-direct snow simulations using constraints and custom attributes.
  • How to troubleshoot common simulation problems and optimize setups for efficient workflows.
  • How to create secondary elements using Pyro and POP systems to enhance simulation realism.
  • How to implement professional shading and lighting techniques using Solaris and Karma.
  • How to utilize Houdini's compositing tools for final snow simulation rendering and post-processing.
  • How to build iterative, art-directable simulation setups that minimize computation requirements.

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Workshop
Snow Simulation Workflows in Houdini
Vellum Simulation Techniques with Diego de Mendizabal
A Workshop by Diego de MendizabalLead/Senior FX TD
intermediate
6h 05m
9 Lessons
Tools
Instructor Diego de MendizabalLead/Senior FX TD

Diego de Mendizabal is a visual effects artist currently working at Sony Pictures Imageworks, with over 15 years of professional experience. He specializes in VFX for both live-action and feature-film animation projects, with credits including Dune (Part 1), Avengers: Infinity War, Spiderman Across the Spider-verse, and, more recently, How to Train Your Dragon, and Sony Animation’s GOAT, among many others.

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