physics_engine_integration

Deterministic physics simulation in an ECS architecture requires decoupling simulation logic from engine physics using pure C# components. You organize force gathering, simulation stepping, and state synchronization into a three-phase fixed-timestep pipeline, relying on substep-capable solvers and event queue processing to maintain consistent gameplay state.

Yes, you can wrap BepuPhysics or a custom solver behind a swappable IPhysicsEngine abstraction interface. This engine-agnostic integration keeps simulation logic fully owned by your ECS and prevents lock-in to Godot's built-in physics.

The best approach is a three-phase physics pipeline separating force gathering, simulation stepping, and state synchronization. This structure handles broad-phase and narrow-phase collision detection workflows, collision layers, and continuous collision detection for fast-moving objects across 2D or 3D adapter scenarios.

Continuous collision detection works with custom solvers by processing collisions through broad-phase and narrow-phase workflows. The swappable IPhysicsEngine abstraction supports CCD alongside collision layers and masks, ensuring fast-moving projectiles are handled deterministically within the fixed-timestep simulation.

Godot's built-in physics couples gameplay logic directly to the engine, making it difficult to keep simulation deterministic and testable. Decoupling into an engine-agnostic ECS with a custom solver removes this dependency, allowing full ownership and testability of fixed-timestep simulation state and visual transforms.

Body handle synchronization is managed during the post-physics state synchronization phase of the pipeline. The system updates ECS components with simulation results and processes event queues, ensuring visual transforms and simulation state remain consistent across the fixed timestep.