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Workshop

Vellum Hair Simulation in Houdini

A Workshop
by Saravmit Singh

Production-Level Character FX Workflow with Saravmit Singh

intermediate
4h 56m 54s
10 Lessons
A Workshop
by Saravmit Singh
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Develop a complete understanding of how to simulate hair within a production-level Character FX workflow with this comprehensive guide by Saravmit Singh. Focusing on bridging the gap between personal experimentation and industry-standard practices, Saravmit teaches how to build production-level templates, create custom tools with the dGroom workflow, and set up an automatic caching system to make your simulation more efficient and reliable. These professional techniques will be applicable to both studio pipelines and personal projects.


This 4.5-hour workshop is designed for intermediate- to advanced-level artists who are familiar with Houdini and want to elevate their grooming skills to meet the demands of production. Through practical examples using a premade groom (not provided with this workshop), artists will learn how to create robust production templates and build custom tools that streamline workflows.


Key techniques covered in this workshop include building and localizing HDAs, designing a custom bend constraint with curve ramp controllers, and developing automated setups that can seamlessly rerun simulations when assets are updated. In addition to technical training, the workshop also provides valuable industry insights drawn from real production experience, including tips on collaboration, asset management, and troubleshooting common issues encountered on large-scale projects.


By completing this workshop, artists will gain a comprehensive understanding of how to simulate hair in a production environment while maintaining efficiency, scalability, and consistency across shots.


The Chipmunk scene project file provided with this workshop was created by Andriy Bilichenko and Aleksandar Horak, courtesy of SideFX.


The groom featured in this workshop is by Gnomon Workshop Instructor, Luis Cadavid. Saravmit also utilizes the dGroom tool by Deepak Rajan.

10 Lessons

01Introduction to Vellum Hair SimulationFree

Saravmit Singh introduces his workshop with a lesson that establishes the foundation for production-level hair simulation in Houdini using Vellum constraints. He discusses why it's important to understand the balance between constraint iterations and bend stiffness to achieve realistic hair behavior while maintaining computational efficiency. His workshop emphasizes that Vellum Hair constraints are specifically engineered for strand simulation, with superior control over twisting and deformation compared to simpler String constraints.

Duration: 14m 17s

Introduction to Vellum Hair Simulation
02Creating Pre-Roll & Skin Geo Setup

This lesson establishes the groundwork for creating procedural CFX templates by demonstrating proper asset integration and common workflow challenges. Saravmit discusses how, while these manual setups work for personal projects, production environments benefit from proper inter-departmental coordination and standardized pipelines. The next lesson will focus on developing additional automated CFX template files to further streamline the process.

Duration: 11m 25s

Creating Pre-Roll & Skin Geo Setup
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03Template for Production-Level Hair Simulation

In this lesson, Saravmit establishes the foundation for a professional CFX pipeline by creating a reusable template system that addresses common challenges in character simulation. His de-intersection workflow using Vellum simulation provides an elegant solution to geometry collision issues that frequently cause problems in character effects work. His emphasis on procedural setup and proper organization creates a scalable system that will streamline future character effects projects.

Duration: 16m 17s

Template for Production-Level Hair Simulation
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04Basic Workflow Using the dGroom Tool in Houdini

The DeGroom tool provides a comprehensive solution for hair deformation in production environments, giving CFX artists greater control and flexibility over the grooming pipeline. By implementing effective workflow organization, caching strategies, and visualization tools, artists can learn how to create robust, production-ready hair setups that are easily maintainable and updatable as assets change. His foundational setup prepares the groundwork for the next phase of creating Vellum hair simulations.

Duration: 35m 27s

Basic Workflow Using the dGroom Tool in Houdini
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05Creating Localized Node: Reduce Fast Translates

This localization node setup serves as essential groundwork for complex vellum hair simulations in Houdini. By moving fast-moving animations to the origin for simulation and then transforming them back to world space, artists can learn how to avoid common simulation artifacts while maintaining full control over the animation. Saravmit's comprehensive HDA approach ensures the setup is reusable and provides the flexibility needed for professional hair simulation workflows.

Duration: 21m 24s

Creating Localized Node: Reduce Fast Translates
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06Creating Vellum Hair Setup

In this lesson, Saravmit provides a comprehensive foundation for professional hair simulation in Houdini, emphasizing both technical execution and production pipeline considerations. His methodical approach to network organization, parameter control, and constraint setup creates a flexible system that can handle complex character hair while remaining accessible to artists across different skill levels and software license types.

Duration: 54m 35s

Creating Vellum Hair Setup
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07Production Groom: Guide Post-Process, Deform, Auto-Cache

This lesson provides essential post-simulation techniques for hair/fur workflows in production environments. Saravmit's methods enable artists to efficiently resolve common simulation issues without rerunning expensive simulations, while maintaining procedural workflows that can be easily updated when animation or grooming assets change. His emphasis on automation and parameter control makes these techniques particularly valuable for large-scale production pipelines.

Duration: 46m 22s

Production Groom: Guide Post-Process, Deform, Auto-Cache
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08Rendering Hair Using Karma: Part 1

This lesson demonstrates a comprehensive production-level workflow for creature rendering in Karma, emphasizing procedural techniques that keep the entire pipeline within Houdini. Saravmit's approach teaches how effective scene organization, attribute management, and MaterialX integration can deliver sophisticated results while maintaining efficiency and flexibility for iterative changes throughout production.

Duration: 29m 53s

Rendering Hair Using Karma: Part 1
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09Rendering Hair Using Karma: Part 2

This lesson demonstrates a complete production-ready workflow for character look development in Houdini, emphasizing procedural techniques and proper scene organization. Saravmit's approach prioritizes flexibility and collaboration between departments while maintaining high-quality results. His focus on USD hierarchy standards and procedural shading techniques provides valuable insights for artists working in modern VFX pipelines where efficiency and consistency are paramount.

Duration: 38m 41s

Rendering Hair Using Karma: Part 2
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10Using the Chipmunk Project File

This final lesson demonstrates the flexibility and adaptability of the hair-grooming pipeline in Houdini. By properly structuring assets with naming conventions and understanding how to modify group selections and guide distributions, artists can learn how to quickly integrate new assets into existing workflows. Saravmit's entire adaptation process takes roughly 30 minutes, making it highly efficient for both personal projects and studio production environments where different assets and animation updates need to be processed procedurally.

Duration: 28m 33s

Using the Chipmunk Project File
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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.

Project Files

When you download the workshop files, you'll get access to a complete chipmunk character animation project with professional grooming and simulation setups. Inside, you'll find:


  • Animation sequence files (.abc) – Cached animation files containing the chipmunk's movement and deformation data for each frame
    - USD scene files - Master scene files including the final rendered groom and animated geometry for modern pipeline workflows
    - Groom simulation caches - Pre-calculated fur dynamics and deformation data so you can study the final results without long processing times
    - Houdini project file (.hip) - The main working file where you can explore the complete grooming and simulation setup used to create the chipmunk's fur

Skills Covered

Who’s this Workshop for?

This workshop is crafted for intermediate to advanced Houdini artists who want to elevate their grooming skills to meet production demands. Character FX artists, technical artists, and pipeline developers seeking industry-standard hair simulation workflows will find this training essential for their professional development.


Freelancers and studio artists who are looking to bridge the gap between personal experimentation and commercial-grade deliverables will benefit significantly. Whether working on independent projects or contributing to large-scale productions, participants will gain the technical expertise and industry insights needed to create robust, scalable hair simulations.

Learning Outcomes

At the conclusion of this workshop, artists will have acquired production-level hair simulation workflows using industry-standard tools, templates, and automated systems for professional Character FX work.


Key skills include:

  • How to build and localize HDAs for efficient production-level hair simulation workflows.
  • How to create custom tools using the dGroom workflow for streamlined grooming processes.
  • How to design custom bend constraints with curve ramp controllers for realistic hair dynamics.
  • How to develop automated caching systems that improve simulation efficiency and reliability.
  • How to build robust production templates that maintain consistency across multiple shots.
  • How to set up automated systems that seamlessly rerun simulations when assets update.
  • How to troubleshoot common production issues and optimize workflows for large-scale projects.
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Workshop
Vellum Hair Simulation in Houdini
Production-Level Character FX Workflow with Saravmit Singh
A Workshop by Saravmit SinghCharacter FX Lead at Bardel Entertainment
intermediate
4h 56m
10 Lessons
Tools
Instructor Saravmit SinghCharacter FX Lead at Bardel Entertainment

Saravmit Singh is a Character FX Lead with extensive experience in cloth, hair, fur, and muscle simulation for feature films and animated productions. Proficient in Houdini, Maya, VEX, and Python, he has led Rig FX development and shot simulations at top studios including Bardel Entertainment, Animal Logic, MPC, and DNEG.


His work spans high-profile projects such as Leo (2023), The Flash, Shazam! Fury of the Gods, Uncharted, and Aquaman. Known for blending technical precision with artistic sensibility, Saravmit excels at building efficient workflows, mentoring artists, and delivering high-quality results in fast-paced production environments.

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