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# falloffStart

The depth (in meters) inside the volume at which the total force starts to linearly fall off.

```
var falloffStart: Float { get set }
```

## Discussion

For particles whose depth is greater than or equal to `falloffStart`, the full force is applied.
For shallower particles, the force ramps linearly from zero at the volume surface to the full
force at `falloffStart`. Must be non-negative; negative values are clamped to zero.
Zero by default, which means the total force is fully applied to all intersecting particles.

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