//added
void DrawVectors()
{
Color beforeColor = Handles.color;
int lineCount = spline.Count * 10;
float f_lineCount = (float)lineCount;
for (int i = 0; i < lineCount; i++)
{
float t = ((float)i / f_lineCount);
Vector3 point = spline.GetPoint(t);
Quaternion rotation = spline.GetRotation(t);
Vector3 up = rotation * Vector3.up;
Handles.color = Color.green;
Handles.DrawLine(point, point + (up * 0.2f));
Vector3 forward = rotation * Vector3.forward;
Handles.color = Color.blue;
Handles.DrawLine(point, point + (forward * 0.2f));
Vector3 right = rotation * Vector3.right;
Handles.color = Color.red;
Handles.DrawLine(point, point + (right * 0.2f));
}
Handles.color = beforeColor;
}