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To ensure quick support and iterations new SDK packages will be published as nightly builds.

Make sure to read the What's New in 3.1 article.

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Changelog

3.1.0

Preview

Disclaimer: The Quantum SDK 3.1.0 development snapshots are not intended to be used for live games.

Build 1854 (Oct 08, 2025)

Breaking Changes

• The library Quantum.Deterministic.dll was merged with Quantun.Engine.dll and remnants of the old dll have to be deleted from projects that migrate to SDK 3.1
• SessionRunner.Arguments now requires setting an explicit TaskRunner to be set. This can be done by either specifying TaskRunner = QuantumTaskRunnerJobs.GetInstance() or by implicitly setting the TaskRunner by using GameParameters = QuantumRunnerUnityFactory.CreateGameParameters for Unity. Use TaskRunner = new DotNetTaskRunner() outside of Unity
• The demo input .unitypackage now requires the installation of the Unity module com.unity.inputsystem
• Quantum.Profiling.HostProfiler was renamed to Quantum.HostProfiler

What's New

• Added table components, which are an alternative to the sparse set ECS components that scale better, see the documentation for more details
• Added a new physics solver ProjectedGaussSeidel that greatly improves the stability when stacking rigid bodies, to use the legacy solver select it in the SimulationConfig
• Added SimulatorContext to exposes simulation callbacks, which allow for modifications to future simulation and prediction advancements, see the documentation for more details
• Optimized the memory required to store the sparse set ECS components which increases the performance of frame copies
• Added new counters to the GraphProfiler to track bandwidth for incoming and outgoing traffic
• Added Unity profiler counters such as Q Frames Verified, Q Frames Predicted, and Q Simulation Time, that can be added to the Unity profiler windows as a custom profiler module
• Added new non-biased random number generation methods to RNGSession: Next(long, long), NextInclusive(long, long), Next(uint), Next(ulong), NextUInt32(), Int64()
• Added QuantumIgnore label support - apply to an asset to be ignored by QuantumUnityDB, useful on prefabs that are used as map prototypes exclusively for example
• Added SimulationUpdateTime.EngineUnscaledCappedDeltaTime which uses a capped version of unscaled delta time, this improves support for breakpoints and Unity Editor pausing in local mode
• Added an FP converter utility window that converts double to FP and raw values
• Added a new configurable value called Heuristic Weight to the NavMeshAgentConfig which can improve the performance of the A* algorithm algorithm, try setting it to 1.5
• Added support for Unity's InputSystem actions which is now used by the demo Quantum input scripts

Changes

• The default simulation rate was increased from 60 Hz to 64 Hz (using powers of two), ensuring that DeltaTime has no rounding error and providing greater precision in physics calculations
• The multi client scripts have been moved out of the SDK package into a .unitypackage (Assets/Photon/Quantum/PackageResources/Quantum-MultiClient)
• Exporting replays and savegames via the menu now saves the last save location as a relative path
• Changed the NavMesh API by renaming Map.NavMeshLinks to Map.NavMeshAssets and by removing the property NavMeshAgentConfig.AutomaticTargetCorrection instead AutomaticTargetCorrectionRadius > 0 is checked to test if target correction is enabled