Flux

Real-time GPU fluid simulation sandbox

Flux is a compute-shader powered fluid simulation sandbox featuring gas dynamics, liquid physics, combustion, and material interactions — all running in real time on your GPU.

What's Inside

Gas Simulation

Eulerian grid solver with smoke, dye advection, vorticity confinement, and thermal buoyancy. Paint obstacles, place emitters, and shape the flow in real time.

Liquid Simulation

Position-Based Fluids (PBF) with thousands of particles. Water, oil, lava, and honey all behave differently with their own viscosity, density, and flow properties. Particles can also form elastic and rigid bonds for materials like rubber and ice.

Fire & Combustion

Wooden obstacles can ignite, burn, and crumble. Heat spreads through solids, while fire emerges through temperature-driven blackbody rendering. Chain reactions happen naturally.

Rigid Bodies

Drop barrels into the simulation and watch them react to buoyancy, drag, and pressure forces — all computed on the GPU. And yes, you can blow them up.

GPU Benchmark

Built-in adaptive benchmark that ramps particle count through multiple tiers to find your GPU's limit. It measures the "knee" — the maximum number of particles your hardware can sustain at 60 FPS — then runs a sustained load test for stability. You get a throughput curve, a score, and a tier rating. Run it, share your results, and see how your GPU stacks up.

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System Requirements

• GPU: Vulkan 1.2 or Direct3D 12 compatible GPU with compute shader support
• OS: Windows 10 / 11
• RAM: 4 GB or more
• Recommended: Dedicated GPU with 4+ GB VRAM

Controls

• Left click + drag: Paint / spawn liquid
• Right click + drag: Erase / interact
• Mouse wheel: Adjust brush size
• Side panel: Select tools and tweak parameters

AI Disclaimer

This project was developed with the help of Claude Code for VS Code using Opus 4.6.

The overall design, debugging, tuning, and implementation still involved hundreds of hours of hands-on work. If AI-assisted projects are not your thing, feel free to skip this one.

Credits

Made by Zicore — 2026

Built with Godot 4.6 | Forward+ Renderer | D3D12

Score	Tier	Example GPUs
5,000+	Legendary	RTX 5090, RTX 5080
3,500+	Excellent	RTX 4090, RTX 5070 Ti
2,000+	Great	RTX 4070, RTX 3080
1,000+	Good	RTX 3060, RTX 4060
300+	Fair	GTX 1660, older GPUs
<300	Low	Integrated / very old