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Workshop

Cinematic Sand & Dust Simulations using Houdini

A Workshop
by Alvaro J. Segura

Creating a Desert Car Scene with Alvaro J. Segura

intermediate
3h 17m 28s
16 Lessons
A Workshop
by Alvaro J. Segura
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Discover how to create a cinematic desert scene with sand and vehicle interactions. This complex yet rewarding simulation is demonstrated using Houdini Indie by Senior FX Artist Alvaro Segura.


This 3-hour workshop begins by delving into the use of Vellum grains and combining them with Pyro simulations to create a variety of sand textures, ranging from fine, dust-like particles to denser clumped sand. Alvaro details the crucial attributes of both Vellum and Pyro, empowering artists with the confidence to tweak these parameters for the desired effects in their own sand simulations.


Alvaro demonstrates techniques for creating clumped textures and achieving a granular, detailed look while also discussing the behavior of fine, realistic dust. Additionally, artists will learn how to optimize collisions and design custom velocity fields for enhanced simulation realism. Alvaro also walks through how to set up multiple containers and leverage TOP networks for wedging to facilitate heavy simulations and segment them into separate containers for an efficient yet powerful mix. In the final leg of the workshop, Alvaro details how to combine these containers back into a single volume as velocity and density VDBs for lighter, optimized volume handling.


By completing this workshop, artists will have practical workflows and the technical expertise to elevate their sand simulations to a professional standard.


This workshop utilizes an SUV car model from Turbosquid.

16 Lessons

01IntroductionFree

Alvaro introduces his workshop, which delivers comprehensive training on creating professional-quality sand simulations in Houdini, leveraging his extensive industry experience. By combining multiple simulation techniques and focusing on optimization strategies, artists will learn to create realistic desert sand interactions that meet professional VFX standards. The emphasis on practical workflows and technical understanding positions this as a valuable resource for advancing sand simulation skills to an industry level.

Duration: 2m 14s

Introduction
02The Relevance of Reference: Evaluating Your Needs

Using high-quality reference material is fundamental to creating convincing VFX simulations that meet professional standards. By carefully analyzing real-world footage, artists can select the most appropriate technical approaches, validate their parameter settings, and ensure their simulations behave authentically. Alvaro shares how the key is understanding how different materials behave in reality and then translating that knowledge into the most efficient simulation methods available in tools like Houdini.

Duration: 9m 53s

The Relevance of Reference: Evaluating Your Needs
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03Quick Setups & Finding Relevant Attributes in Vellum Grains

This lesson establishes a systematic workflow for Vellum grain simulation development, emphasizing the critical importance of rapid prototyping with simplified geometry before tackling production-scale simulations. By focusing on key attributes like attraction weight, repulsion weight, and friction within a well-organized testing framework, artists can efficiently dial in realistic grain behaviors. Alvaro's approach of combining procedural setup techniques with strategic parameter identification provides a solid foundation for creating controllable, production-ready grain simulations while maintaining fast iteration speeds.

Duration: 20m 49s

Quick Setups & Finding Relevant Attributes in Vellum Grains
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04Quick Setups & Finding Relevant Attributes in Pyro Sims

This lesson establishes the fundamental technical approach for creating realistic pyroclastic dust simulations in Houdini. Successful pyroclastic effects require the careful combination of four main attributes (temperature, density, velocity, and divergence) along with proper vortex confinement and damping controls. Alvaro's workflow demonstrates the importance of rapid iteration through low-resolution testing to identify optimal parameters before committing to computationally expensive high-resolution simulations.

Duration: 15m 22s

Quick Setups & Finding Relevant Attributes in Pyro Sims
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05Preparing Source Geometries for FX Setup

This lesson establishes the foundational geometry setup phase for a complex VFX simulation involving vehicle-terrain interaction. Alvaro's emphasis on proper asset organization, velocity calculation, and production workflow standards demonstrates the importance of thorough preparation before beginning actual simulation work. He provides technical knowledge for procedural asset creation as well as practical insights into professional VFX pipeline requirements.

Duration: 10m 4s

Preparing Source Geometries for FX Setup
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06Procedural Extraction of Areas for Simulation

This lesson emphasizes efficiency and procedural thinking in VFX pipeline development. By focusing on contact areas, optimizing geometry, and maintaining subframe data integrity, the setup creates a foundation for realistic vehicle-terrain interaction simulations. Alvaro's methodical approach of iterative refinement and strategic caching demonstrates professional practices for handling complex, computationally expensive simulations in production environments.

Duration: 14m 43s

Procedural Extraction of Areas for Simulation
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07Optimize Collision for Each Part Involved

This lesson demonstrates essential techniques for converting CAD-style 3D models into simulation-ready assets. Alvaro emphasizes that geometry cleanup and preparation are a typical challenge in production environments, as models aren't usually designed with physics simulation in mind. His systematic approach of separating components, creating clean VDB proxies, and setting up proper collision sources provides a solid foundation for realistic car simulation scenarios.

Duration: 14m 14s

Optimize Collision for Each Part Involved
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08Create Vellum Grain Setup for Shot & Organizing DOP Net Elements

This lesson demonstrates a methodical approach to creating realistic sand simulations in Houdini using Vellum grains. The key to success lies in properly setting up collision objects, managing attribute transfers for selective simulation regions, and iteratively testing at low resolution before committing to computationally expensive high-resolution simulations. Alvaro's emphasis on starting simple and building complexity gradually provides a solid foundation for creating convincing sand interaction effects with animated vehicles.

Duration: 13m 30s

Create Vellum Grain Setup for Shot & Organizing DOP Net Elements
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09Build up Your Setup & Create Custom Attraction Weight Values

This lesson demonstrates a methodical approach to refining Vellum grain simulations through iterative testing and parameter adjustment. The key to successful grain simulation lies in balancing multiple interdependent parameters while maintaining an efficient workflow that tests changes at appropriate resolutions. The addition of noise-driven attraction weights proves crucial for achieving realistic material behavior with natural clumping and granular variation.

Duration: 11m 51s

Build up Your Setup & Create Custom Attraction Weight Values
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10Vellum Constraints for Optimal Control on Clumps & Granular Look

This lesson demonstrates sophisticated sand-simulation techniques that go beyond basic particle systems by incorporating constraint-based clumping behavior. While the approach successfully creates realistic granular effects with proper collision response and natural-looking sand accumulation, it also highlights the complexity of balancing multiple simulation parameters at higher resolutions. Alvaro's methodical approach to debugging velocity issues shows the iterative nature required for advanced particle simulations in production environments.

Duration: 16m 21s

Vellum Constraints for Optimal Control on Clumps & Granular Look
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11About Crazy Particle Behavior

This lesson demonstrates a practical approach to particle simulation in VFX production, emphasizing that initial results don't need to be perfect since the production process involves collaborative refinement. Alvaro prepares his convincing sand simulation effect in order to further enhance it with additional dust elements and timing adjustments to match his reference material.

Duration: 5m 6s

About Crazy Particle Behavior
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12Pyro Implementation for Thinner Dust

This lesson addresses real-world production challenges in Pyro simulation setup, emphasizing the importance of data cleanup and optimization techniques. Alvaro demonstrates how managing complex simulations often requires breaking them into smaller, manageable segments rather than attempting to process everything in a single container. These workflows are essential for achieving high-quality results while maintaining reasonable computational demands in professional VFX production environments.

Duration: 10m 24s

Pyro Implementation for Thinner Dust
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13Multiple Container Setup & Wedging

The multiple-container approach provides a more efficient, organized way to run Pyro simulations in Houdini. By dividing the simulation space into independent containers, artists can achieve better performance and more control over complex simulations. The setup requires careful node management and parameter tweaking, but ultimately offers superior workflow efficiency, particularly in professional studio environments where optimization is crucial.

Duration: 15m 8s

Multiple Container Setup & Wedging
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14Turn Collisions into a Velocity Field Source

This lesson demonstrates the complex technical process of creating realistic vehicular dust effects through systematic parameter adjustment and problem-solving. Alvaro successfully overcomes collision integration challenges by developing an alternative velocity-field approach, ultimately achieving convincing dust dynamics that react properly to car movement. His workflow prepares for high-resolution production rendering while maintaining flexibility for further artistic refinement.

Duration: 10m 26s

Turn Collisions into a Velocity Field Source
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15Setting up TOP Net for Wedging Containers

This technique enables efficient batch processing of multiple simulation variations, which can be seamlessly combined into a single, more complex result. Alvaro's workflow demonstrates advanced Houdini concepts, including proper data type handling, VDB operations, and TOP network automation. The final combined simulation maintains both the visual density information and the underlying velocity data needed for rendering, while optimizing file sizes and viewport performance through strategic compression and visualization settings.

Duration: 17m 19s

Setting up TOP Net for Wedging Containers
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16Rendering Overview & Final Thoughts

This lesson concludes Alvaro's workshop with a successful demonstration of complex grain and pyro simulations, while highlighting important technical considerations for volume rendering and time blending. Alvaro emphasizes that, while good results can be achieved with workarounds like masking, proper simulation settings (particularly sub-steps and advected interpolation) will yield superior outcomes. The straightforward shader approach, leveraging Karma's rendering capabilities, demonstrates that sophisticated visual effects can be achieved without overly complex material setups.

Duration: 10m 4s

Rendering Overview & Final Thoughts
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Primary tools

For this workshop you’ll need:

Nuke
Houdini

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

Project Files

When you download the project file, you'll have access to:


  • Houdini scene file – A ready-to-open project file that can be used as an example or a starting point for you to follow along with the workshop
zip
ASE01_ProjectFiles.zip
0.38 MB
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Skills Covered

Who’s this Workshop for?

This workshop is designed for intermediate to advanced VFX artists and technical directors working in film, television, or game development who have foundational knowledge of Houdini and want to master complex sand simulation techniques for cinematic productions.


Motion graphics artists, environmental designers, and simulation specialists will also benefit significantly from this comprehensive training. They'll gain professional-grade workflows for creating realistic desert environments and vehicle interactions that meet industry standards for high-end visual effects work.

Learning Outcomes

By completing this workshop, artists will master the technical expertise and practical workflows needed to create professional-standard cinematic sand simulations with vehicle interactions.


Key skills include:

  • How to combine Vellum Grains with Pyro simulations for varied sand textures and densities.
  • How to configure crucial Vellum and Pyro attributes for fine dust and clumped sand effects.
  • How to create granular, detailed looks while maintaining realistic dust particle behavior patterns.
  • How to optimize collision systems and design custom velocity fields for enhanced simulation realism.
  • How to set up multiple containers using TOP networks for efficient heavy simulation management.
  • How to combine separate containers into unified velocity and density VDBs for optimized workflows.
  • How to segment complex simulations for powerful mixing while maintaining production-ready performance standards.
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Workshop
Cinematic Sand & Dust Simulations using Houdini
Creating a Desert Car Scene with Alvaro J. Segura
A Workshop by Alvaro J. SeguraFreelance Sr FX Artist, FX Lead & FX Supervisor
intermediate
3h 17m
16 Lessons
Instructor Alvaro J. SeguraFreelance Sr FX Artist, FX Lead & FX Supervisor

Alvaro Segura is a Senior Houdini Artist at Brazen Animation with over 20 years of experience creating high-end visual effects for film and interactive media. Renowned for his expertise in simulation, dynamics, and procedural FX, he has become a trusted creative force for some of the industry's most demanding projects.


Throughout his career, Alvaro has contributed to leading studios including Blizzard Entertainment, CoSA VFX, The Mill, Digital Domain, Zoic Studios, and Framestore. His film credits span blockbuster franchises such as Blue Beetle, Black Panther: Wakanda Forever, Terminator: Dark Fate, Black Panther, Ant-Man, The Lion King, and Pirates of the Caribbean.

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  • Alvaro is a highly dedicated, flexible, and open-minded instructor who played a key role in helping me build a deep and lasting understanding of Houdini. He brings vast professional experience and consistently goes above and beyond to support his students.

    - Philipp Kratzer
    Lead CFX Technical Director at TRIXTER

  • Alvaro is a passionate and incredibly dedicated Houdini professional with a great artistic eye and a deep knowledge of the software. He is thoughtful, highly analytical, and holds himself to the highest standards, both professionally and personally. While working on a project together, I found him to be friendly, approachable and very efficient at communicating his progress on project deliverables.

    - Patricia Cornet
    Vicer President of Marketing at Slice

  • I had the pleasure of working with Alvaro on Ant‑Man, where he created complex full-CG environments in Houdini that seamlessly supported character interaction. He developed an extensive environmental toolset capable of meeting demanding artistic and technical challenges, including managing vast amounts of data across numerous shots. Alvaro takes on challenging tasks, communicating issues and proposing smart solutions before they escalate. Combined with his strong artistic vision and collaborative mindset, he is a joy to work with and a great asset.

    - Peter Claes
    Expert Technical Artist at Infinity Ward

  • Alvaro is a great artist and has a thorough understanding of the film industry. He has a solid work ethic and can always be found hard at work at his desk. Most of us had a hard time competing with his focus! He's a great friend and can always be counted on to get the job done.

    - Andy Seredy
    Sr. Technical Animator at Gearbox

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