# Sandbox.Movement.MoveModeSwim.PrePhysicsStep

```csharp
void PrePhysicsStep()
```

Detect the bank while swimming, then carry the body toward its moving landing.
Collision response remains entirely in the native physics controller.

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