Building Fluid Solvers for VFX and Houdini- Part 1&2 by Anas Alaa

Ready to stop using fluid simulators as black boxes and start building your own? This two-part course bundle is your ticket to understanding the core math and logic behind fluid simulation engines. You’ll go from grasping basic calculus to implementing solver techniques in Houdini, gaining the foundational knowledge to create your own VFX tools.

🎯 What you’ll learn

• Understand the calculus and linear algebra essential for simulation programming.
• Learn to differentiate and integrate multivariable functions for fluid dynamics.
• Grasp the concepts of Gradient, Divergence, and Curl in simulation contexts.
• Explore Ordinary and Partial Differential Equations (ODEs/PDEs) used in solvers.
• Understand the Navier-Stokes equations and their practical application.
• Learn about MAC Grids and spatial discretization for simulations.
• Implement advection techniques like the Semi-Lagrangian method.
• Enforce incompressibility and solve linear systems for realistic fluid behavior.
• Build a basic smoke solver in Houdini using microsolvers.
• Translate simulation concepts into pseudocode for implementation in any language.

✅ Requirements

• Skills: Basic understanding of math (school-level calculus is helpful but not strictly required), familiarity with 3D concepts.
• Tools: A computer capable of running Houdini.
• Hardware: A computer capable of running Houdini (specifics depend on Houdini’s requirements).

📝 Description

This comprehensive two-part course bundle demystifies the complex world of fluid simulation programming. Part 1 lays a rock-solid mathematical foundation, breaking down essential calculus and linear algebra concepts into digestible lessons. You’ll learn the math that powers every smoke, fire, and water sim, even if your math memory is a bit rusty. We start from the basics and build up to the vector calculus professionals use daily.

Part 2 then bridges theory and practice. With your math knowledge in hand, you’ll dive into the equations governing fluid behavior, like the Navier-Stokes equations, and learn how to discretize space and time using techniques like MAC grids. You’ll explore crucial steps like advection and enforcing incompressibility, understanding the logic behind realistic fluid motion. The course culminates in building a practical simple smoke solver within Houdini‘s DOPs system using microsolvers, showing you how to translate theoretical concepts into working VFX tools. This isn’t about replicating commercial software but about giving you the core building blocks and pseudocode to start your own solver development journey.

🧑‍🎓 Who this course is for

• FX artists and TDs who want to understand the math behind their simulation tools.
• Technical artists interested in developing or customizing simulation code.
• Aspiring simulation programmers looking for a practical entry point.
• Anyone curious about fluid mechanics and how it’s applied in visual effects.
• Houdini users who want to peek under the hood of simulation networks.

🧑‍🏫 About the Author

Anas Alaa is a seasoned Freelance Visual Effects Artist and instructor with a deep passion for Houdini and simulation. Since 2014, he’s been crafting stunning visual simulations, with a particular focus on large-scale water effects that have gained recognition on platforms like CGRecord. Anas also shares his expertise as an instructor at MIX training. While water simulations are a specialty, his skills span fire, explosions, destruction, and particle systems. Driven by a strong mathematical background, he enjoys dissecting the intricate math behind fluid dynamics and solvers, leading him to develop specialized courses that make complex solver mathematics accessible and engaging for all skill levels.

🏁 Final Result

• A strong grasp of the mathematical principles and logical structures underpinning fluid solvers.
• Practical pseudocode examples and workflows that can be adapted to various programming languages.
• Hands-on experience building a basic smoke simulation in Houdini using microsolvers.
• A clear roadmap and the foundational knowledge to pursue advanced solver development and create your own custom fluid simulation tools.