Add scale to Arrow3D

manim/animation/growing.py

@@ -195,6 +195,33 @@ def construct(self):
                 self.play(GrowArrow(arrows[0]))
                 self.play(GrowArrow(arrows[1], point_color=RED))
 
+    .. manim :: GrowArrow3DExample
+        class GrowArrow3DExample(ThreeDScene):
+            def construct(self):
+                self.set_camera_orientation(
+                    phi=0 * DEGREES,
+                    theta=90 * DEGREES,
+                )
+                arrows = [
+                    Arrow3D(
+                        2 * LEFT,
+                        2 * RIGHT,
+                        thickness=0.05,
+                        color=BLUE,),
+                    Arrow3D(
+                        2 * DR,
+                        2 * UL,
+                        thickness=0.05,
+                        color=RED,
+                        )
+                    ]
+                VGroup(*arrows).set_x(0).arrange(buff=2)
+                self.wait(0.5)
+
+                self.play(GrowArrow(arrows[0]), run_time=2)
+                self.play(GrowArrow(arrows[1]), run_time=2)
+
+                self.wait(1)
     """
 
     def __init__(

manim/mobject/three_d/three_dimensions.py

@@ -1226,6 +1226,24 @@ def __init__(
     def get_end(self) -> np.ndarray:
         return self.end_point.get_center()
 
+    def scale(self, factor: float, scale_tips: bool = False, **kwargs: Any) -> Self:  # type: ignore[override]
+        if self.get_length() == 0:
+            return self
+
+        if scale_tips:  # if scaling tip scale entire group
+            super().scale(factor, **kwargs)
+            return self
+
+        # if scaling only shaft
+        cone = self.cone
+        self.remove(cone)
+
+        super().scale(factor, **kwargs)
+
+        self.add(cone)
+        cone.move_to(self.end_point.get_center())
+        return self
+
 
 class Torus(Surface):
     """A torus.