From c19b3138084c3e636cf63f0b55a2e036bb613e99 Mon Sep 17 00:00:00 2001
From: Grant Sanderson <grantsanderson7@gmail.com>
Date: Thu, 17 Mar 2016 23:53:59 -0700
Subject: [PATCH] freeze_background for scenes

---
 camera.py      | 2 +-
 scene/scene.py | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/camera.py b/camera.py
index 6ec9d1e3..39a2d7d9 100644
--- a/camera.py
+++ b/camera.py
@@ -41,7 +41,7 @@ class Camera(object):
         self.space_shape = (space_height, space_width)
 
     def init_background(self):
-        if self.background:
+        if self.background is not None:
             self.pixel_shape = self.background.shape[:2]
         else:
             background_rgb = color_to_int_rgb(self.background_color)
diff --git a/scene/scene.py b/scene/scene.py
index 196959d3..0d01b22e 100644
--- a/scene/scene.py
+++ b/scene/scene.py
@@ -60,6 +60,11 @@ class Scene(object):
         else:
             self.camera.reset()
         self.camera.capture_mobjects(mobjects, **kwargs)
+
+    def freeze_background(self):
+        self.update_frame()
+        self.set_camera(Camera(self.get_frame()))
+        self.clear()
     ###
 
     def add(self, *mobjects):