CGCircuit – Building Fluid Solvers For Visual Effects and Houdini Part 2
English | Tutorial | Size: 3.75 GB
In this second installment of our simulation series, we dive into the world of fluids-breaking down the complex math and simulation logic into approachable, practical concepts. If you’ve taken Part 1, you already have a solid grasp of the math foundations, and now you’ll learn how to use them to simulate fluids using step-by-step pseudocode and real Houdini examples.
Rather than attempting to build a full-featured commercial fluid solver (which takes years and a dedicated team), this course is designed as your launchpad-giving you the core ideas, math concepts, and solver techniques that form the backbone of every modern fluid simulator.
You’ll learn how to translate these techniques into simple pseudocode that can be implemented in any language you prefer. Finally, we’ll explore how a basic smoke solver in Houdini works using the microsolver-based DOP network, helping you bridge theory and practical application.
By the end of this course, you’ll have a clear path toward building your own custom fluid solvers, and you’ll be well-equipped to explore advanced topics like FLIP, fire simulations, and turbulence modeling on your own.
What You’ll Learn (Chapter Breakdown):
Chapter 1: ODEs, PDEs, and MatricesUnderstand the types of equations used in simulations-ordinary and partial differential equations-and how linear algebra and matrices support them.
Chapter 2: Fluid EquationsExplore the famous Navier-Stokes equations in a simplified, approachable way. Understand how they are derived and how they relate to real-world fluid behavior. We also introduce boundary conditions.
Chapter 3: MAC Grids & DiscretizationLearn how to discretize space and time for simulation. We’ll focus on the Marker-And-Cell (MAC) grid technique, widely used in fluid solvers.
Chapter 4: Advection TechniquesDive into the advection step of fluid simulations. You’ll understand the Semi-Lagrangian method, its simplicity, and its drawbacks (like artificial diffusion).
Chapter 5: Enforcing IncompressibilityThis is the heart of realistic fluids! Learn how to apply the incompressibility condition, solve the resulting linear system, and handle boundary conditions effectively.
Chapter 6: Simple Smoke Solver in HoudiniSee everything in action. You’ll build a simple smoke solver using Houdini’s DOP microsolvers, translating the theory into practical workflows-an essential step before writing your own solver code.
Who is This Course For?
VFX students or professionals who want to go beyond black-box solvers
Technical artists learning to write or customize simulation code
Houdini users curious about what’s really going on under the hood
Anyone interested in fluid mechanics and how it powers visual effects
Important Notes:
This course does not teach how to build a full-featured production solver like RealFlow or Houdini’s Smoke Solver from scratch-this requires a dedicated development team and years of R&D.
Instead, you’ll gain the core knowledge and pseudocode building blocks that will allow you to experiment, prototype, and grow into more advanced solver development over time.
What You’ll Take Away:
A strong understanding of the mathematics and logic behind fluid solvers
Pseudocode and workflows that can be implemented in any language
A working knowledge of how to use microsolvers in Houdini to build basic smoke sims
A clear roadmap toward creating your own fluid simulation tools in the future
Keywords: fluid simulation fundamentals, Navier-Stokes, MAC grids, microsolvers, simple smoke solver, Houdini DOPs, fluid solver pseudocode, PDEs and ODEs, advection, pressure solver
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