diff --git a/manimlib/mobject/types/vectorized_mobject.py b/manimlib/mobject/types/vectorized_mobject.py
index 6effe4f1..a881d668 100644
--- a/manimlib/mobject/types/vectorized_mobject.py
+++ b/manimlib/mobject/types/vectorized_mobject.py
@@ -57,6 +57,7 @@ class VMobject(Mobject):
         ('point', np.float32, (3,)),
         ('orientation', np.float32, (1,)),
         ('color', np.float32, (4,)),
+        ('vert_index', np.float32, (1,)),
     ]
     stroke_dtype: Sequence[Tuple[str, type, Tuple[int]]] = [
         ("point", np.float32, (3,)),
@@ -1212,7 +1213,11 @@ class VMobject(Mobject):
         return self.stroke_data
 
     def get_fill_shader_data(self) -> np.ndarray:
-        self.fill_data = resize_array(self.fill_data, len(self.get_points()))
+        points = self.get_points()
+        if len(self.fill_data) != len(points):
+            self.fill_data = resize_array(self.fill_data, len(points))
+            self.fill_data["vert_index"][:, 0] = range(len(points))
+
         self.read_data_to_shader(self.fill_data, "point", "points")
         self.read_data_to_shader(self.fill_data, "color", "fill_rgba")
         self.read_data_to_shader(self.fill_data, "orientation", "orientation")
diff --git a/manimlib/shaders/quadratic_bezier_fill/vert.glsl b/manimlib/shaders/quadratic_bezier_fill/vert.glsl
index 293ed854..2a0fc1a2 100644
--- a/manimlib/shaders/quadratic_bezier_fill/vert.glsl
+++ b/manimlib/shaders/quadratic_bezier_fill/vert.glsl
@@ -5,6 +5,7 @@
 in vec3 point;
 in float orientation;
 in vec4 color;
+in float vert_index;
 
 out vec3 bp;  // Bezier control point
 out float v_orientation;
@@ -18,6 +19,5 @@ void main(){
     bp = position_point_into_frame(point);
     v_orientation = orientation;
     v_color = color;
-    // Implicit conversion from int to float
-    v_vert_index = gl_VertexID;
+    v_vert_index = vert_index;
 }
\ No newline at end of file