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FluXY – 2.5D fluid simulator

This is a paid asset, but now you can download it totally free. However, please keep in mind that this package is only provided for studying or testing the product prior to purchasing it, not for business functions.

Overview :

FluXY simulates 2D fluids that look 3D using your GPU. can be used to simulate fire, smoke, paint, water, trails, and a variety of VFX.


Shaders are included for:

  • Opaque fluid surface (URP/HDRP, 2019.4 and up)
  • Transparent fluid surface (URP, 2019.4 and up)
  • Volumetrics, new in 1.3 (URP/HDRP, 2021.2 and up)
  • You can use the included shaders on your project right out of the box or as inspiration for your own simulation-driven shaders.

Expand 2D fluids into the 3D realme:

  • Fluxy fluids live in containers. A container can either be a custom mesh or a flat rectangular area. Containers can face the camera, and objects in the scene can splat density and velocity data onto containers. All 3D data coming from the outside world, such as forces and velocities, is projected to 2D. This gives the impression of a full 3D simulation but is orders of magnitude cheaper.

(NEW in 1.4) Record simulations to flipbook textures:

  • Select any container and record a flipbook animation from it! These are cheap to play anywhere in your scene and will look smooth even if they have few frames thanks to motion-vector-based interpolation.

Turbulence, pressure, buoyancy, surface tension, external forces:

  • Take full control of the simulation: make swirly fluid by increasing turbulence, make it expand by reducing pressure, rise to the sky by increasing buoyancy, use adhesion and surface tension to make dripping paint, let it be affected by wind.

Inertial effects:

  • Fluids can inherit the movement of their container. Put a torch in a character’s hand, and the flames will be affected by running, jumping, waving, and any other movement. You have full control over how much acceleration or velocity is transferred to the fluid.

Simulate fire, smoke, ink, water, paint, and other VFX:

  • Make your players traverse oily water, unleash magic spells, add smoke to destructible or crumbling objects, and more.

Dynamic Level of Detail (LOD):

  • Integrated with Unity’s LOD components, distant simulations are performed at lower resolution. The transition between levels of detail is smooth as butter.

Fast separable pressure solver:

  • Calculating pressure is usually the most expensive part of fluid simulation, as the same basic math operation has to be repeated many times per frame. FluXY offers you a fast, separable pressure solver that achieves results comparable to traditional methods in a fraction of the time. And, you can still choose to use the traditional way if you wish.


  • When using the traditional pressure solver, pressure values can double up as a cheap wave simulation.

100% GPU:

  • The entirety of the fluid simulation happens on your GPU, using fragment and vertex shaders.

Parallel simulation of multiple fluid containers:

  • Simulating one fluid container is fast, but simulating up to 16 at the same time is even faster. FluXY uses automatic dynamic atlasing to put multiple simulations into the same texture for maximum performance.

Full source code included. Fast support and regular updates:

  • If you want to modify FluXY, add custom features to it, or just take a look under the hood, you’ll be happy to know that every script and shader is included and easily editable. If you need assistance or have a question, drop us a line, and we’ll do our best to help.

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