added change_default implementation to OpenGLMobject

Author: behackl

manim/mobject/opengl_mobject.py

@@ -2,7 +2,7 @@
 import itertools as it
 import random
 import sys
-from functools import wraps
+from functools import partialmethod, wraps
 from math import ceil
 from typing import Iterable, Optional, Tuple, Union
 
@@ -121,6 +121,18 @@ def __init__(
         if self.depth_test:
             self.apply_depth_test()
 
+    @classmethod
+    def __init_subclass__(cls, **kwargs):
+        super().__init_subclass__(**kwargs)
+        cls._original__init__ = cls.__init__
+
+    @classmethod
+    def change_default(cls, **kwargs):
+        if kwargs:
+            cls.__init__ = partialmethod(cls.__init__, **kwargs)
+        else:
+            cls.__init__ = cls._original__init__
+
     def __str__(self):
         return self.__class__.__name__