returns the point on the track that the camera is moving towards
0 is the first point and number_of_points-1 is the last index (use STATE_track_get_number_of_points() to get this number
if point_index<0 then it set it to 0
if point_index is bigger than the maximum index then it is set to the maximum allowed. In those cases it returns VR_ERROR
to notify the change from the given value.
If there is no track associated with the camera it returns VR_ERROR without setting the value
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