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 # InverseSimulationSettings – Setting an inverse simulation

 Last update: 17.07.2025 

The following script sample shows you an example on how to set an Inverse Simulation.

**GetInverseSimulationSettings** returns an **InverseSimulationSettings** object that allows you to modify geometry and simulation settings.

The **InverseSimulationSettings** object includes five main methods:

- **SetMonteCarlo** with the parameters 
    - bool dispersion
    - bool splitting
    - int nbGatheringRaysPerSource
    - int maxGatheringError
    - bool fastTransmissionGathering
    - int automaticSaveFrequencySeconds
    - EnumOptimizedPropagationMode
    - optimizedPropagation
    - int nbStandardPassesBeforeOptimizedPasses, optional
- **SetDeterminist** with the parameters: 
    - EnumPhotonMapMode
    - photonMapMode
    - int ambientSampling
    - int maxNbSurfaceInteractions
    - bool antiAliasing
    - int specularApproxAngle
- **SetDeterministPhotonMap** with the parameters: 
    - int maxNeighbors
    - int maxSearchRadius
    - bool fastTransmissionGathering
    - bool useFinalGathering
    - int finalGatheringMaxNeighbors, optional
    - int finalGatheringSplittingNb, optional
- **SetDeterministPhotonMapBuild** with the parameters: 
    - int nbPhotonsInDirectPhase
    - int nbSurfaceInteractionsInDirectPhase
- **SetPropagationErrorAnalysis(*bool propagationErrorAnalysis*)**

**SetInverseSimulationSettings** applies the changes made with the **GetInverseSimulationSettings** function.

```ironpython
settings = inverseSimulation2.GetInverseSimulationSettings()
settings.SetDeterminist(SIM.InverseSimulationSettings.EnumPhotonMapMode.Load, 100, 10, False, 0)
settings.SetDeterministPhotonMapBuild(10000,100)
settings.SetDeterministPhotonMap(100, 10000000, True, False)
settings.SetPropagationErrorAnalysis(True)
inverseSimulation2.SetInverseSimulationSettings(settings)

```