Godot Box2D v3 is a high-performance physics extension for Godot 4.3+ that implements Box2D v3. It can be considered a successor to the Godot Box2D extension.

• Improved stability and performance, especially for large piles of bodies
• Faster, more accurate queries (e.g. cast_motion, intersect_ray)
• Continuous collision detection (CCD) enabled by default for dynamic vs static collisions
• Additional APIs to make the physics server easier and faster to use (docs coming soon)

Most of the Physics API has been implemented, but the following features do not have parity with Godot Physics:

• WorldBoundaryShape2D unsupported (planned for a future version of Box2D)
• SeparationRayShape2D unsupported
• Space parameters (space_set_param) unsupported because Box2D v3 uses a different solver
• "Cast Ray" CCD mode (CCDMode::CCD_MODE_CAST_RAY) unsupported
• Contacts are not visible when Visible Collision Shapes is enabled
• Convex polygons cannot have more than 8 vertices (does not affect CollisionPolygon2D)
• CharacterBody2D: unstable movement on moving platforms
• One-way collision is decided from the contact normal, ignoring the one-way collision margin. A rigid body that ends up overlapping a one-way platform from above is pushed back out rather than allowed to continue through. Character movement (CharacterBody2D) still accounts for penetration depth and margin.
• Collision exceptions place the two bodies in the same simulation island, so they sleep and wake together, and adding one at runtime wakes both.
• Removing a collision exception between two bodies that are already overlapping and at rest does not push them apart. Collision resumes once either body moves.

• Cross-platform determinism
• Serialization + Rollback

Originally created by Andrew Song (Pizzaandy).