{"id":7690,"date":"2025-05-13T15:30:25","date_gmt":"2025-05-13T13:30:25","guid":{"rendered":"https:\/\/www.tronatic-studio.com\/?p=7690"},"modified":"2025-05-14T09:33:31","modified_gmt":"2025-05-14T07:33:31","slug":"les-secrets-des-simulations-de-fluides-en-cgi","status":"publish","type":"post","link":"https:\/\/www.tronatic-studio.com\/en\/les-secrets-des-simulations-de-fluides-en-cgi\/","title":{"rendered":"The secrets of CGI fluid simulations"},"content":{"rendered":"

CGI <\/a>fluid simulations have become an essential part of audiovisual productions. They can take different forms: water, fire, smoke, lava, etc. But creating them realistically is a highly complex challenge that relies on a mastery of simulation software and algorithms. So how do studios go about creating realistic fluid simulations? That's what we're going to find out in this article!<\/p>\n\n\n\n

The art of controlling the uncontrollable<\/h3>\n\n\n\n

Let's start by defining what a fluid simulation is. In practical terms, a fluid simulation - which can be water, fire, smoke, etc. - is the result of a 3D calculation based on an algorithm. - is the result of a 3D calculation based on an algorithm. It will never be as precise as a 'tangible' object (house, character, car, etc.), because a simulation is intangible. Yes, because as Bem says in Harry Potter and the Prisoner of Azkaban, \"It's like trying to catch smoke.<\/em> Trying to catch smoke with your hands\".<\/em> It's not possible. A 'tangible' object is made by hand, it is worked on and is precise, unlike a 'non-tangible' object which is not defined by hand, but is the result of a more or less chaotic calculation.<\/p>\n\n\n\n

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The physics of fluids in CGI<\/h3>\n\n\n\n

Let's now tackle the second part of our question: how is a simulation made? We need a transmitter, which can take several forms, and emit a variety of information: fire, smoke, water, velocity, pressure, temperature, etc., and a simulator (or simulation zone). Today's simulators are based on voxels (like pixels in 3D: small cubes containing dynamic information) and are limited to a precise zone in which the simulation evolves. Numerous parameters can be set, such as :<\/p>\n\n\n\n