Chinese character appears in Tex() but disappears in MathTex()

[LXYan2333]

Description of bug / unexpected behavior

When I add a Chinese character in Tex, it works fine. However, if I add a Chinese charactor into a MathTex, it just disappear.

Expected behavior

Chinese character appears in MathTex, just like in Tex.

How to reproduce the issue

Code for reproducing the problem

from manim import *

class CreateCircle(Scene):
    def construct(self):
        tex = MathTex('\Omega _{Hello你好}', tex_template=TexTemplateLibrary.ctex)
        self.add(tex)

However, Tex works fine

from manim import *

class CreateCircle(Scene):
    def construct(self):
        tex = Tex('你好', tex_template=TexTemplateLibrary.ctex)
        self.add(tex)

Can also reproduce in the online manim:

Images/GIFs

"你好" in MathTex

Can also reproduce in the online manim:

"你好" in Tex

Logs

Terminal output

> manim -pql .\scene.py
Manim Community v0.16.0.post0

[10/01/22 23:51:50] INFO                                                                     scene_file_writer.py:728
                             File ready at
                             'C:\Users\lxyan\programs\Python\Manim\hello_manim\media\images\
                             scene\CreateCircle_ManimCE_v0.16.0.post0.png'

                    INFO     Rendered CreateCircle                                                       scene.py:240
                             Played 0 animations
                    INFO     Previewed File at:                                                       file_ops.py:224
                             'C:\Users\lxyan\programs\Python\Manim\hello_manim\media\images\scene\Cre
                             ateCircle_ManimCE_v0.16.0.post0.png'

System specifications

System Details

• OS: Windows 10 21H2
• RAM: 16G
• Python version: Python 3.10.7
• Installed modules:

Package             Version
------------------- ------------
autopep8            1.7.0
certifi             2022.9.14
charset-normalizer  2.1.1
click               8.1.3
click-default-group 1.2.2
cloup               0.13.1
colorama            0.4.5
colour              0.1.5
commonmark          0.9.1
decorator           5.1.1
glcontext           2.3.6
idna                3.4
isosurfaces         0.1.0
lxml                4.9.1
manim               0.16.0.post0
manim-pptx          0.1.6
ManimPango          0.4.1
mapbox-earcut       0.12.11
moderngl            5.6.4
moderngl-window     2.4.2
multipledispatch    0.6.0
networkx            2.8.6
numpy               1.23.2
Pillow              9.2.0
pip                 22.2.2
pycairo             1.21.0
pycodestyle         2.9.1
pydub               0.25.1
pyglet              2.0a4
Pygments            2.13.0
pyrr                0.10.3
python-pptx         0.6.21
requests            2.28.1
rich                12.5.1
scipy               1.9.1
screeninfo          0.8.1
setuptools          63.2.0
six                 1.16.0
skia-pathops        0.7.2
srt                 3.5.2
toml                0.10.2
tqdm                4.64.1
unvcode             1.0.0
urllib3             1.26.12
watchdog            2.1.9
XlsxWriter          3.0.3

LaTeX details

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

FFMPEG

Output of ffmpeg -version:

ffmpeg version 5.1.2-full_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers
built with gcc 12.1.0 (Rev2, Built by MSYS2 project)
configuration: --enable-gpl --enable-version3 --enable-shared --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab --enable-libvmaf 
--enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
libavutil      57. 28.100 / 57. 28.100
libavcodec     59. 37.100 / 59. 37.100
libavformat    59. 27.100 / 59. 27.100
libavdevice    59.  7.100 / 59.  7.100
libavfilter     8. 44.100 /  8. 44.100
libswscale      6.  7.100 /  6.  7.100
libswresample   4.  7.100 /  4.  7.100
libpostproc    56.  6.100 / 56.  6.100

Additional comments

[LXYan2333]

This is a latex problom. Just wrap Chinese character in a \mbox{} solves this problem.

Please considering add this to the MathTex manual

(as Discord and Reddit is not accessible in the Chinese mainland, and access to StackOverFlow and GitHub is horribly slow and unstable)