cuberact-library

A growing collection of GDExtension components for Godot 4.5+

Starting with CRope2D, a 2D rope physics node built on Verlet integration. Collisions, anchoring, breaking, and a fully modular architecture for forces, rendering, and line processing.

Free to try, licensed when you ship

cuberact-library is free to use for learning, prototyping, game jams, experiments and personal projects. You only need a paid license when you publish a commercial game made with it. The download here on itch is that license. It is the same package as the free version (see "Get it free" below), so buying here is simply how you pay for your license and support the project. Thank you!

New in v1.1.0

• Rope sleep system: settled ropes skip simulation and run only a cheap watchdog, a big win for scenes full of ropes
• Red-black constraint solver (now the default): up to 10x faster substeps on long ropes
• CRopeWorldGravityForceMod: follows your project's 2D gravity automatically, including runtime changes
• Gradient coloring on the direct renderer
• Six new showcase scenes, for 17 in total, plus a lot of fixes that make the rope much more rock-solid

Features

• Verlet integration with configurable stiffness and damping
• Red-black or sequential constraint solver
• Sleep system that skips simulation for settled ropes and wakes on disturbance
• Collision support (StaticBody2D, RigidBody2D, CharacterBody2D)
• Anchor system with two-way physical interaction
• Modular architecture: forces, line processing, breaking, rendering
• Write custom modules in GDScript, no C++ required
• Debug probe for performance profiling

Built-in Modules

• Force: Gravity, World Gravity, Wind, Magnet
• Line: Smooth, Simplify, Subdivide
• Render: Direct, Line2D, Debug
• Break: Tension-based

17 Example Scenes

Every feature comes with an interactive example: bioluminescent jellyfish, a firefly meadow, growing sunflowers, a kite in the wind, gravity and magnets, collisions, grappling hooks, rope breaking, a stress test, and more. Play them in your browser, or download the project, open it in Godot, and explore everything hands-on. The package includes the full library, all 17 example scenes, and 10 custom module examples.

Get it free

• Live demo - play all 17 scenes in your browser at cuberact.org
• Godot Asset Library - search for "cuberact" right inside the Godot Editor and install with one click
• GitHub - clone or download from the repository

Platforms

macOS (Universal) · Windows (x86_64, ARM64) · Linux (x86_64, ARM64) · Web (WASM)

License

cuberact-library is free to use, with no sign-up, no trial, and no feature restrictions. You only need a paid license when you publish a game that uses the library. Everything else stays free: learning, prototyping, game jams, experiments, personal projects. Buying this download on itch is how you get that license.

Full terms: License

Links

• Cuberact.org
• Documentation
• GitHub