Sure, here's a rewritten version of the function that uses the ternary operator and returns -1 if the distance variable is out of range:

```c#
float MapDistanceToRange(float distance)
{
// Check if distance value is within bounds, return -1 if not
float mappedValue = (distance >= 200f && distance <= 300f) ? (distance - 200f) / 100f : -1f;
return mappedValue;
}
```

This function checks if the distance variable falls within the range of 200 to 300 using the ternary operator. If it does, the distance value is mapped to the 0-1 range using the same formula as before. If it doesn't, the function returns -1.

You can call this function from any other script in your Unity project to map distance values to the desired range and handle out-of-range values with the returned -1.
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