refraction bug

[astraw]

I just hit this:

Exception in thread CoordinateProcessor: Traceback (most recent call last): File "/usr/lib/python2.7/threading.py", line 551, in __bootstrap_inner self.run() File "/usr/lib/python2.7/dist-packages/flydra/main_brain/coordinate_receiver.py", line 418, in run self.process_data( incoming_2d_data ) File "/usr/lib/python2.7/dist-packages/flydra/main_brain/coordinate_receiver.py", line 555, in process_data deferred_2d_data, File "/usr/lib/python2.7/dist-packages/flydra/main_brain/coordinate_receiver.py", line 706, in _process_parsed_data debug2=self.debug_level.isSet()) File "/usr/lib/python2.7/dist-packages/flydra/kalman/flydra_tracker.py", line 117, in calculate_a_posteriori_estimates debug1=debug2) for tro in self.live_tracked_objects ] File "_flydra_tracked_object.pyx", line 365, in _flydra_tracked_object.TrackedObject.calculate_a_posteriori_estimate (src/_flydra_tracked_object.c:5965) File "_flydra_tracked_object.pyx", line 472, in _flydra_tracked_object.TrackedObject._filter_data (src/_flydra_tracked_object.c:10111) File "_flydra_tracked_object.pyx", line 515, in _flydra_tracked_object.TrackedObject._filter_data (src/_flydra_tracked_object.c:8011) File "/usr/lib/python2.7/dist-packages/flydra/reconstruct.py", line 1646, in find2d distorted=distorted ) File "/usr/lib/python2.7/dist-packages/flydra/water.py", line 48, in view_points_in_water height, r[i], depth[i])) File "_refraction.pyx", line 41, in _refraction.find_fastest_path_fermat (src/_refraction.c:746) File "_refraction.pyx", line 63, in _refraction.find_fastest_path_fermat (src/_refraction.c:618) File "_Roots3And4.pyx", line 24, in _Roots3And4.real_root_less_than (src/_Roots3And4.c:651) ValueError: more than one valid root found