diff --git a/manimlib/mobject/mobject.py b/manimlib/mobject/mobject.py
index 93f0e31c..1c7eb3b0 100644
--- a/manimlib/mobject/mobject.py
+++ b/manimlib/mobject/mobject.py
@@ -102,6 +102,11 @@ class Mobject(object):
         self.resize_points(len(points))
         self.data["points"][:] = points
 
+    def append_points(self, new_points):
+        self.resize_points(self.get_num_points() + len(new_points))
+        self.data["points"][-len(new_points):] = new_points
+        return self
+
     def get_points(self):
         return self.data["points"]
 
@@ -748,6 +753,7 @@ class Mobject(object):
                 submob.fade_to(color, alpha)
         return self
 
+    # TODO, get rid of this
     def fade(self, darkness=0.5, family=True):
         if family:
             for submob in self.submobjects:
@@ -1147,7 +1153,7 @@ class Mobject(object):
     def push_self_into_submobjects(self):
         copy = self.deepcopy()
         copy.set_submobjects([])
-        self.reset_points()
+        self.resize_points(0)
         self.add(copy)
         return self
 
@@ -1329,15 +1335,12 @@ class Mobject(object):
         self.shader_wrapper.refresh_id()
         return self
 
-    def get_blank_shader_data_array(self, size, name="shader_data"):
+    def get_resized_shader_data_array(self, size):
         # If possible, try to populate an existing array, rather
         # than recreating it each frame
-        arr = getattr(self, name)
-        if arr.size != size:
-            new_arr = resize_array(arr, size)
-            setattr(self, name, new_arr)
-            return new_arr
-        return arr
+        if self.shader_data.size != size:
+            self.shader_data = resize_array(self.shader_data, size)
+        return self.shader_data
 
     def get_shader_wrapper(self):
         self.shader_wrapper.vert_data = self.get_shader_data()
@@ -1364,8 +1367,9 @@ class Mobject(object):
         return result
 
     def get_shader_data(self):
-        # May be different for subclasses
-        return self.shader_data
+        data = self.get_resized_shader_data_array(self.get_num_points())
+        data["point"] = self.data["points"]
+        return data
 
     def get_shader_uniforms(self):
         return {
diff --git a/manimlib/mobject/types/image_mobject.py b/manimlib/mobject/types/image_mobject.py
index c984bc50..47104fbb 100644
--- a/manimlib/mobject/types/image_mobject.py
+++ b/manimlib/mobject/types/image_mobject.py
@@ -4,10 +4,8 @@ from PIL import Image
 
 from manimlib.constants import *
 from manimlib.mobject.mobject import Mobject
-from manimlib.utils.bezier import interpolate
 from manimlib.utils.bezier import inverse_interpolate
 from manimlib.utils.images import get_full_raster_image_path
-from manimlib.utils.iterables import listify
 
 
 class ImageMobject(Mobject):
@@ -28,36 +26,25 @@ class ImageMobject(Mobject):
         self.texture_paths = {"Texture": path}
         super().__init__(**kwargs)
 
+    def init_data(self):
+        self.data = {
+            "points": np.array([UL, DL, UR, DR]),
+            "im_coords": np.array([(0, 0), (0, 1), (1, 0), (1, 1)]),
+            "opacity": np.array([[self.opacity]], dtype=np.float32),
+        }
+
     def init_points(self):
-        self.points = np.array([UL, DL, UR, DR])
-        self.im_coords = np.array([(0, 0), (0, 1), (1, 0), (1, 1)])
         size = self.image.size
         self.set_width(2 * size[0] / size[1], stretch=True)
         self.set_height(self.height)
 
-    def init_colors(self):
-        self.set_opacity(self.opacity)
-
-    def set_opacity(self, alpha, family=True):
-        opacity = listify(alpha)
-        diff = 4 - len(opacity)
-        opacity += [opacity[-1]] * diff
-        self.opacity = np.array(opacity).reshape((4, 1))
-
-        if family:
-            for sm in self.submobjects:
-                sm.set_opacity(alpha)
-
-    def fade(self, darkness=0.5, family=True):
-        self.set_opacity(1 - darkness, family)
+    def set_opacity(self, opacity, family=True):
+        # TODO, account for opacity coming in as an array
+        mobs = self.get_family() if family else [self]
+        for mob in mobs:
+            mob.data["opacity"][:, 0] = opacity
         return self
 
-    def interpolate_color(self, mobject1, mobject2, alpha):
-        # TODO, transition between actual images?
-        self.opacity = interpolate(
-            mobject1.opacity, mobject2.opacity, alpha
-        )
-
     def point_to_rgb(self, point):
         x0, y0 = self.get_corner(UL)[:2]
         x1, y1 = self.get_corner(DR)[:2]
@@ -75,8 +62,7 @@ class ImageMobject(Mobject):
         return np.array(rgb) / 255
 
     def get_shader_data(self):
-        data = self.get_blank_shader_data_array(len(self.points))
-        data["point"] = self.points
-        data["im_coords"] = self.im_coords
-        data["opacity"] = self.opacity
+        data = super().get_shader_data()
+        data["im_coords"] = self.data["im_coords"]
+        data["opacity"] = self.data["opacity"]
         return data
diff --git a/manimlib/mobject/types/surface.py b/manimlib/mobject/types/surface.py
index 99f59849..b71ad996 100644
--- a/manimlib/mobject/types/surface.py
+++ b/manimlib/mobject/types/surface.py
@@ -173,7 +173,7 @@ class ParametricSurface(Mobject):
     # For shaders
     def get_shader_data(self):
         s_points, du_points, dv_points = self.get_surface_points_and_nudged_points()
-        data = self.get_blank_shader_data_array(len(s_points))
+        data = self.get_resized_shader_data_array(len(s_points))
         data["point"] = s_points
         data["du_point"] = du_points
         data["dv_point"] = dv_points
@@ -274,7 +274,7 @@ class TexturedSurface(ParametricSurface):
         result["num_textures"] = self.num_textures
         return result
 
-    def fill_in_shader_color_info(self, data):
-        data["im_coords"] = self.data["im_coords"]
-        data["opacity"] = self.data["opacity"]
-        return data
+    def fill_in_shader_color_info(self, shader_data):
+        shader_data["im_coords"] = self.data["im_coords"]
+        shader_data["opacity"] = self.data["opacity"]
+        return shader_data