Camera shouldn't try to display ValueTrackers

camera/camera.py

@@ -2,14 +2,10 @@
 import itertools as it
 import numpy as np
 import operator as op
-import copy
 
-# import aggdraw
-import copy
 import time
 
 from PIL import Image
-from colour import Color
 from scipy.spatial.distance import pdist
 import cairo
 
@@ -18,6 +14,7 @@ from mobject.types.image_mobject import AbstractImageMobject
 from mobject.mobject import Mobject
 from mobject.types.point_cloud_mobject import PMobject
 from mobject.types.vectorized_mobject import VMobject
+from mobject.value_tracker import ValueTracker
 from utils.color import color_to_int_rgba
 from utils.color import rgb_to_hex
 from utils.config_ops import digest_config
@@ -203,7 +200,10 @@ class Camera(object):
 
     ####
 
-    def extract_mobject_family_members(self, mobjects, only_those_with_points=False):
+    def extract_mobject_family_members(
+            self, mobjects,
+            only_those_with_points=False,
+            ignore_value_trackers=False):
         if only_those_with_points:
             method = Mobject.family_members_with_points
         else:
@@ -213,17 +213,20 @@ class Camera(object):
                 method(m)
                 for m in mobjects
                 if not (isinstance(m, VMobject) and m.is_subpath)
+                if not (ignore_value_trackers and isinstance(m, ValueTracker))
             ])
         ))
 
     def get_mobjects_to_display(
-        self, mobjects,
-        include_submobjects=True,
-        excluded_mobjects=None,
-    ):
+            self, mobjects,
+            include_submobjects=True,
+            ignore_value_trackers=True,
+            excluded_mobjects=None):
         if include_submobjects:
             mobjects = self.extract_mobject_family_members(
-                mobjects, only_those_with_points=True
+                mobjects,
+                only_those_with_points=True,
+                ignore_value_trackers=ignore_value_trackers,
             )
             if excluded_mobjects:
                 all_excluded = self.extract_mobject_family_members(