wave8-wrong-system-group-fixed-timestep

Frame-rate dependent behavior in Unity DOTS physics occurs when fixed-timestep simulation logic is placed in a render-driven system group instead of FixedStepSimulationSystemGroup. Relocating force application and collision processing ensures deterministic execution.

To fix nondeterministic collision responses, review your system's [UpdateInGroup] attribute and move the logic into FixedStepSimulationSystemGroup. Apply correct UpdateBefore and UpdateAfter ordering to enforce a fixed simulation cadence.

PhysicsVelocity writes belong in FixedStepSimulationSystemGroup to maintain deterministic physics. Placing these component updates in render-rate groups causes frame-rate dependency and inconsistent simulation results.

No, the fixed timestep configuration should be set once during initialization, not per frame. Configuring it repeatedly causes simulation inconsistencies and breaks the deterministic execution required for physics logic.

Separate simulation-rate logic from render-rate interpolation by refactoring systems into FixedStepSimulationSystemGroup with proper UpdateBefore and UpdateAfter attributes, keeping fixed-rate execution isolated from render-driven updates.

Use FixedStepSimulationSystemGroup when systems apply forces, write PhysicsMass, or handle collision and trigger events. These operations require a fixed simulation cadence to prevent nondeterministic physics and frame-rate dependencies.