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[Home](./index.md) &gt; [server](./server.md) &gt; [SimulationEventPayloads](./server.simulationeventpayloads.md) &gt; ["SIMULATION.STEP\_START"](./server.simulationeventpayloads._simulation.step_start_.md)

## SimulationEventPayloads."SIMULATION.STEP\_START" property

Emitted when the simulation step starts.

**Signature:**

```typescript
[SimulationEvent.STEP_START]: {
        simulation: Simulation;
        tickDeltaMs: number;
    };
```