# Sandbox.WaterBody.ToSurface

```csharp
Vector3 ToSurface(Vector3 worldPosition)
```

Convert a world position to surface-relative coordinates measured in world inches.
Positive Z lies above the water; X and Y follow the body's rotation without its scale.

### Parameters

- `worldPosition` (`Vector3`)

### Returns

`Vector3`

Declared in [Sandbox.WaterBody](/api/Sandbox.WaterBody).
Assembly: `Sandbox.Engine`.