diff --git a/python/raytracing/eyeball.py b/python/raytracing/eyeball.py
index 318ef85a..c1c4f3a2 100644
--- a/python/raytracing/eyeball.py
+++ b/python/raytracing/eyeball.py
@@ -9,6 +9,10 @@
 
 import math
 
+eyeball_type_none = 0
+eyeball_type_paper_plane = 1
+eyeball_type_eyeball = 2
+
 _max_num_eyeballs = 40
 
 class Eyeball:
@@ -25,7 +29,7 @@ def __init__(self, raytracing_view):
     def _enabled(self):
         return (
             self.raytracing_view.ui_parameter_dict['eyeballSize'][1] > 0 and
-            self.raytracing_view.ui_parameter_dict['eyeballType'][1] > 0)
+            self.raytracing_view.ui_parameter_dict['eyeballType'][1] > eyeball_type_none)
 
     def get_compile_time_defs(self):
         if not self._enabled():
@@ -62,7 +66,7 @@ def get_uniform_bindings(self):
         min_inner_product = -RF(1.0 + 1e-7)
 
         eyeballRadius = self.raytracing_view.ui_parameter_dict['eyeballSize'][1]
-        if self.raytracing_view.ui_parameter_dict['eyeballType'][1] == 2:
+        if self.raytracing_view.ui_parameter_dict['eyeballType'][1] == eyeball_type_eyeball:
             eyeballRadius = eyeballRadius / 2.0
         tets_to_data = [ [] for i in range(self.num_tetrahedra) ]
 
diff --git a/python/raytracing/ideal_raytracing_data.py b/python/raytracing/ideal_raytracing_data.py
index 4b079a4a..08bfbc3e 100644
--- a/python/raytracing/ideal_raytracing_data.py
+++ b/python/raytracing/ideal_raytracing_data.py
@@ -392,15 +392,14 @@ def initial_view_state(self):
         weight = 0.0
         return (boost, tet_num, weight)
 
-#    def update_view_state(self, boost_tet_num_and_weight,
-#                          m=matrix([[1.0, 0.0, 0.0, 0.0],
-#                                    [0.0, 1.0, 0.0, 0.0],
-#                                    [0.0, 0.0, 1.0, 0.0],
-#                                    [0.0, 0.0, 0.0, 1.0]])):
-#        boost, tet_num, weight = boost_tet_num_and_weight
-#        boost = boost * m
-#        return boost, tet_num, weight
-
+    def update_view_state(self, boost_tet_num_and_weight,
+                          m=matrix([[1.0, 0.0, 0.0, 0.0],
+                                    [0.0, 1.0, 0.0, 0.0],
+                                    [0.0, 0.0, 1.0, 0.0],
+                                    [0.0, 0.0, 0.0, 1.0]])):
+        boost, tet_num, weight = boost_tet_num_and_weight
+        boost = boost * m
+        return boost, tet_num, weight
 
 def _pgl2_matrix_for_face(tet, F):
     gluing = tet.Gluing[F]
diff --git a/python/raytracing/inside_viewer.py b/python/raytracing/inside_viewer.py
index 7a3c6282..e6670f49 100644
--- a/python/raytracing/inside_viewer.py
+++ b/python/raytracing/inside_viewer.py
@@ -10,6 +10,7 @@
 from .geodesics_window import GeodesicsWindow
 from .hyperboloid_utilities import unit_3_vector_and_distance_to_O13_hyperbolic_translation
 from .zoom_slider import Slider, ZoomSlider
+from .eyeball import eyeball_type_none, eyeball_type_paper_plane, eyeball_type_eyeball
 
 try:
     from math import gcd as _gcd
@@ -350,9 +351,12 @@ def create_eyeball_frame(self, parent):
         self_type_label.grid(row=row, column=0)
         
         radio_buttons = []
-        for i, text in enumerate(["None", "Paper plane", "Eyeball"]):
+        for i, (eyeball_type, text) in enumerate([
+                (eyeball_type_none, "None"),
+                (eyeball_type_paper_plane, "Paper plane"),
+                (eyeball_type_eyeball, "Eyeball")]):
             button = ttk.Radiobutton(frame,
-                                     value=i,
+                                     value=eyeball_type,
                                      text=text,
                                      takefocus=0)
             button.grid(row=row, column=1 + i, padx=8, sticky=tkinter.NW)
diff --git a/python/raytracing/raytracing_view.py b/python/raytracing/raytracing_view.py
index ee4a913c..ef535ccf 100644
--- a/python/raytracing/raytracing_view.py
+++ b/python/raytracing/raytracing_view.py
@@ -4,6 +4,7 @@
 from .hyperboloid_navigation import *
 from .geodesics import Geodesics
 from .eyeball import Eyeball
+from .eyeball import eyeball_type_none, eyeball_type_paper_plane
 from . import shaders
 
 from snappy.CyOpenGL import SimpleImageShaderWidget
@@ -127,7 +128,7 @@ def __init__(self,
             'geodesicTubeEnables' : ['bool[]', []],
             'eyeballSize' : ['float', 0.5],
             'freezeEyeball' : ['bool', False],
-            'eyeballType' : ['int', 0 if has_weights else 1]
+            'eyeballType' : ['int', eyeball_type_none if has_weights else eyeball_type_paper_plane]
             }
 
         if cohomology_class: