From bd89056c8e78297645bc253e4ff3a87dce3da133 Mon Sep 17 00:00:00 2001
From: Grant Sanderson <grant@3blue1brown.com>
Date: Thu, 2 Feb 2023 14:29:37 -0800
Subject: [PATCH] Only recalculate outer_vert_indices when points are resized

---
 manimlib/mobject/types/vectorized_mobject.py | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/manimlib/mobject/types/vectorized_mobject.py b/manimlib/mobject/types/vectorized_mobject.py
index a9d2abf3..f54d18ec 100644
--- a/manimlib/mobject/types/vectorized_mobject.py
+++ b/manimlib/mobject/types/vectorized_mobject.py
@@ -1053,13 +1053,22 @@ class VMobject(Mobject):
         vmob.pointwise_become_partial(self, a, b)
         return vmob
 
+    def resize_points(
+        self,
+        new_length: int,
+        resize_func: Callable[[np.ndarray, int], np.ndarray] = resize_array
+    ) -> Self:
+        super().resize_points(new_length, resize_func)
+
+        n_curves = self.get_num_curves()
+        # Creates the pattern (0, 1, 2, 2, 3, 4, 4, 5, 6, ...)
+        self.outer_vert_indices = (np.arange(1, 3 * n_curves + 1) * 2) // 3
+        return self
+
     def get_outer_vert_indices(self) -> np.ndarray:
         """
         Returns the pattern (0, 1, 2, 2, 3, 4, 4, 5, 6, ...)
         """
-        n_curves = self.get_num_curves()
-        if len(self.outer_vert_indices) != 3 * n_curves:
-            self.outer_vert_indices = (np.arange(1, 3 * n_curves + 1) * 2) // 3
         return self.outer_vert_indices
 
     # Data for shaders that may need refreshing