add_fixed_orientation_mobjects fails with MathTex

[tobiasBora]

Description of bug / unexpected behavior

It seems like add_fixed_orientation_mobjects does not work with MathTex (or maybe I'm using it badly?) as the object is rotated.

Expected behavior

The text should not be rotated.

How to reproduce the issue

Code for reproducing the problem

from manim import *

class Tests(ThreeDScene):
    def construct(self):
        sphere = Surface(
            lambda u, v: R * np.array([
                np.sin(v) * np.cos(u),
                np.cos(v),
                np.sin(v) * np.sin(u),
            ]),
            u_range=[0, TAU], v_range=[0, PI],
            resolution=(36, 18),
            fill_color=BLUE_D, fill_opacity=0.0,
            stroke_color=BLUE_E, stroke_width=0.4, stroke_opacity=0.6,
        )
        labels = MathTex(r"|0\rangle")
        self.add_fixed_orientation_mobjects(labels)
        self.play(Create(sphere, lag_ratio=0.01))
        self.play(sphere.animate.set_fill(BLUE_D, opacity=0.30))
        # Move "up" a bit:
        self.move_camera(
            phi=-20 * DEGREES,
            added_anims = [
            ],
            run_time=3.0, rate_func=smooth)
        ## Rotate around Y axis (move_camera is too hard to use if not around z axis)
        self.play(
            Rotate(
                VGroup(m for m in self.mobjects if isinstance(m, (VMobject, Surface))),
                PI/4,
                [0,1,0],
                about_point=ORIGIN,
            ),
            run_time=3.0,
            rate_func=smooth
        )
        self.wait(0.3)

Additional media files

Images/GIFs

Tests.mp4

Logs

Terminal output

PASTE HERE OR PROVIDE LINK TO https://pastebin.com/ OR SIMILAR

System specifications

System Details

• OS (with version, e.g., Windows 10 v2004 or macOS 10.15 (Catalina)): Linux NixOs 25.11
• RAM:
• Python version (python/py/python3 --version): 3.13.19
• Installed modules (provide output from pip list):

PASTE HERE

LaTeX details

• LaTeX distribution (e.g. TeX Live 2020):
• Installed LaTeX packages:

Additional comments

EDIT My guess is that there is a clash with the rotation that wants to be applied twice… So far my trick is not to use add_fixed_orientation_mobject, instead I use a dummy point to track the location and always_redraw to place the point at the coordinate of the dummy point with the rotation I want, like this:

class Tests(ThreeDScene):
    def construct(self):
        sphere = Surface(
            lambda u, v: R * np.array([
                np.sin(v) * np.cos(u),
                np.cos(v),
                np.sin(v) * np.sin(u),
            ]),
            u_range=[0, TAU], v_range=[0, PI],
            resolution=(36, 18),
            fill_color=BLUE_D, fill_opacity=0.0,
            stroke_color=BLUE_E, stroke_width=0.4, stroke_opacity=0.6,
        )
        labelp = Circle(0).move_to(label_pos(0, 2))
        labels = always_redraw(lambda: MathTex(r"|0\rangle").move_to(labelp))
        self.add(labels)
        self.add(labelp)
        self.play(Create(sphere, lag_ratio=0.01))
        self.play(sphere.animate.set_fill(BLUE_D, opacity=0.30))
        # Move "up" a bit:
        self.move_camera(
            phi=-20 * DEGREES,
            added_anims = [
            ],
            run_time=3.0, rate_func=smooth)
        ## Rotate around Y axis (move_camera is too hard to use if not around z axis)
        self.play(
            Rotate(
                VGroup(m for m in self.mobjects if isinstance(m, (VMobject, Surface)) and m != labels),
                PI/4,
                [0,1,0],
                about_point=ORIGIN,
            ),
            run_time=3.0,
            rate_func=smooth
        )
        self.wait(0.3)