From e8ac25903e19cbb2b2c2037c988baafce4ddcbbc Mon Sep 17 00:00:00 2001
From: Grant Sanderson <grant@3blue1brown.com>
Date: Mon, 11 Apr 2022 09:59:24 -0700
Subject: [PATCH] Add case for zero vectors on angle_between_vectors

---
 manimlib/utils/space_ops.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/manimlib/utils/space_ops.py b/manimlib/utils/space_ops.py
index d570d04d..a959b8a5 100644
--- a/manimlib/utils/space_ops.py
+++ b/manimlib/utils/space_ops.py
@@ -152,6 +152,8 @@ def angle_between_vectors(v1: np.ndarray, v2: np.ndarray) -> float:
     """
     n1 = get_norm(v1)
     n2 = get_norm(v2)
+    if n1 == 0 or n2 == 0:
+        return 0
     cos_angle = np.dot(v1, v2) / (n1 * n2)
     return math.acos(clip(cos_angle, -1, 1))