Using Rotate_Vector in VectorField cause dimensions problem

[mryuans]

Describe the error

When I was using rotate_vector to write a function for VectorField, there is a dimension error, which is not a problem in past versions.

Code and Error

Code:

from manimlib import * # type: ignore


class Simulation(Scene):
    def construct(self) -> None:
        axes = NumberPlane()
        def div_func(p: np.ndarray) -> np.ndarray:
            return p / 3
        field_dir = VectorField(div_func, axes)
        self.play(FadeIn(field_dir))

        def curl_func(p): # <- this function
            return rotate_vector(p / 3, PI / 2)
        field_curl = VectorField(curl_func, axes)
        self.play(
            ReplacementTransform(field_dir, field_curl), run_time=1
        )

Error:
Traceback (most recent call last):
File "/Users/cengyi/miniconda3/envs/manimgl/bin/manimgl", line 8, in
sys.exit(main())
~~~~^^
File "/Users/cengyi/miniconda3/envs/manimgl/lib/python3.13/site-packages/manimlib/main.py", line 61, in main
run_scenes()
~~~~~~~~~~^^
File "/Users/cengyi/miniconda3/envs/manimgl/lib/python3.13/site-packages/manimlib/main.py", line 39, in run_scenes
scene.run()
~~~~~~~~~^^
File "/Users/cengyi/miniconda3/envs/manimgl/lib/python3.13/site-packages/manimlib/scene/scene.py", line 155, in run
self.construct()
~~~~~~~~~~~~~~^^
File "/Users/cengyi/Manimproduce/manim-learning/note/simulation.py", line 14, in construct
field_curl = VectorField(curl_func, axes)
File "/Users/cengyi/miniconda3/envs/manimgl/lib/python3.13/site-packages/manimlib/mobject/vector_field.py", line 185, in init
max_value = max(map(get_norm, func(self.sample_coords)))
~~~~^^^^^^^^^^^^^^^^^^^^
File "/Users/cengyi/Manimproduce/manim-learning/note/simulation.py", line 13, in curl_func
return rotate_vector(p / 3, PI / 2)
File "/Users/cengyi/miniconda3/envs/manimgl/lib/python3.13/site-packages/manimlib/utils/space_ops.py", line 123, in rotate_vector
return np.dot(vector, rot.as_matrix().T)
~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: shapes (561,2) and (3,3) not aligned: 2 (dim 1) != 3 (dim 0)

Environment

OS System: MacOS
manim version: master (have used the changes in PR #2330)
python version:3.13.2

[mryuans]

This is an example of the usage of rotate_vector in 3B1B's video in _2018 dir_curl:

class Introduction(MovingCameraScene):
    CONFIG = {
        "stream_lines_config": {
            "start_points_generator_config": {
                "delta_x": 1.0 / 8,
                "delta_y": 1.0 / 8,
                "y_min": -8.5,
                "y_max": 8.5,
            }
        },
        "vector_field_config": {},
        "virtual_time": 3,
    }

    def construct(self):
        # Divergence
        def div_func(p):
            return p / 3
        div_vector_field = VectorField(
            div_func, **self.vector_field_config
        )
        stream_lines = StreamLines(
            div_func, **self.stream_lines_config
        )
        stream_lines.shuffle()
        div_title = self.get_title("Divergence")

        self.add(div_vector_field)
        self.play(
            LaggedStartMap(ShowPassingFlash, stream_lines),
            FadeIn(div_title[0]),
            *list(map(GrowFromCenter, div_title[1]))
        )

        # Curl
        def curl_func(p):
            return rotate_vector(p / 3, 90 * DEGREES)

[Varniex]

It's all written in the error:

ValueError: shapes (561,2) and (3,3) not aligned: 2 (dim 1) != 3 (dim 0).

p should have 3 columns instead got 2. I believe it's a 2D vector, it should be 3D