这是在这里提出的问题的继续:获取路径渲染器的长度

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private TrailRenderer trail;
void Start () {
        trail = GetComponent<TrailRenderer>();
        Length = 0;
        trail.Clear();
    }

 void Update () {
        GetTrailLength ();
        Debug.Log ("Length: " + Length);

        if (Length > 1.0) {
            trail.material.color = Color.red;
        } else {
            trail.material.color = Color.white;
        }
    }


  public void GetTrailLength () {
        Length = 0f;
       
        var points = new Vector3[trail.positionCount];
        var count = trail.GetPositions (points);

        // Store the first position 
        var start = points[0];

        // Iterate through the rest of positions
        for (var i = 1; i < count; i++) {
            // get the current position
            var end = points[i];
            // Add the distance to the last position
            Length += Vector3.Distance (start, end);
            // update the start position for the next iteration
            start = end;
        }

    }