[Solved] How to correctly use TrailRenderer.GetPositions

This functions fills an array that you give as parameter, and returns the number of elements that were put in it. This is a more optimized way than returning an array, because it doesn't require allocating new memory space.

Here is how you should use it:

 const int MAX_POSITIONS = 100;
 Vector3[] TrailRecorded = new Vector3[MAX_POSITIONS];
 
 void YourFunction ()
 {
    int numberOfPositions = GetComponent<TrailRenderer>().GetPositions (TrailRecorded);
 }

Then you can use the numberOfPositions first elements in TrailRecorded as needed. The other elements are either empty or out-of-date.