(re)set background color when initializing scene (ManimCommunity#2668)

Author: behackl

manim/renderer/opengl_renderer.py

@@ -246,7 +246,7 @@ def __init__(self, file_writer_class=SceneFileWriter, skip_animations=False):
         # Initialize texture map.
         self.path_to_texture_id = {}
 
-        self._background_color = color_to_rgba(config["background_color"], 1.0)
+        self.background_color = config["background_color"]
 
     def init_scene(self, scene):
         self.partial_movie_files = []
@@ -255,6 +255,7 @@ def init_scene(self, scene):
             scene.__class__.__name__,
         )
         self.scene = scene
+        self.background_color = config["background_color"]
         if not hasattr(self, "window"):
             if self.should_create_window():
                 from .opengl_renderer_window import Window