# Simulate(float, uint)

> Use this method to fast-forward the visual effect by simulating all systems for several step counts using the specified delta time.

## Definition

* **Type:** Method
* **Namespace:** [UnityEngine.VFX](/engine/6000.7/script-reference/unityengine/vfx.md)
* **Assembly:** UnityEngine.VFXModule

```csharp
public void Simulate(float stepDeltaTime, uint stepCount = 1)
```

### Parameters

**** (\[float]\(https\://learn.microsoft.com/dotnet/api/system.single)): The delta time, in seconds, the simulation applies to each step.**** (\[uint]\(https\://learn.microsoft.com/dotnet/api/system.uint32)): Number of steps to proceed.