`move_camera` does not move center to `frame_center` in 3d scene

[markromanmiller]

Description of bug / unexpected behavior

At the end of the motion animation, the dot, which represents the target of the move_camera operation, is not in the center of the image.

Expected behavior

I expected the dot to be in the center when the animation finishes.

How to reproduce the issue

Code for reproducing the problem

```py class CameraMotionTest(ThreeDScene): def construct(self): axes = ThreeDAxes(width=1) self.play(FadeIn(axes)) self.wait() should_be_center = np.array([PI ** 2 / 8, PI / 4, 0.5]) self.add(Dot(point=should_be_center)) self.move_camera(phi=55 * DEGREES, theta=-55 * DEGREES, distance=3, frame_center=should_be_center) self.wait() ```

Additional media files

Images/GIFs


Logs

Terminal output

``` happy to provide if necessary... ```

System specifications

System Details

- OS (with version, e.g Windows 10 v2004 or macOS 10.15 (Catalina)): Ubuntu 18.04 - RAM: - Python version (`python/py/python3 --version`): Python 3.6.9 - Installed modules (provide output from `pip list`): ``` cairocffi (file-.cairocffi-VERSION) cffi (1.14.4) colorama (0.4.4) colour (0.1.5) commonmark (0.9.1) dataclasses (0.7) manimce (0.1.1) numpy (1.19.4) pangocairocffi (file-.pangocairocffi-VERSION) pangocffi (file-.pangocffi-VERSION) Pillow (8.0.1) pip (9.0.1) pkg-resources (0.0.0) progressbar (2.5) pycairo (1.20.0) pycparser (2.20) pydub (0.24.1) Pygments (2.7.3) rich (6.2.0) scipy (1.5.4) setuptools (39.0.1) tqdm (4.54.1) typing-extensions (3.7.4.3) wheel (0.36.2) ```

LaTeX details

+ LaTeX distribution (e.g. TeX Live 2020): + Installed LaTeX packages: ``` i ae: Virtual fonts for T1 encoded CMR-fonts i amscls: AMS document classes for LaTeX i amsfonts: TeX fonts from the American Mathematical Society i amsmath: AMS mathematical facilities for LaTeX i anysize: A simple package to set up document margins i apa6: Format documents in APA style (6th edition) i atbegshi: Execute stuff at \shipout time i attachfile2: Attach files into PDF i attachfile2.x86_64-linux: x86_64-linux files of attachfile2 i atveryend: Hooks at the very end of a document i auxhook: Hooks for auxiliary files i babel: Multilingual support for Plain TeX or LaTeX i babel-english: Babel support for English i babelbib: Multilingual bibliographies i beamer: A LaTeX class for producing presentations and slides i bibtex: Process bibliographies for LaTeX, etc i bibtex.x86_64-linux: x86_64-linux files of bibtex i bigintcalc: Integer calculations on very large numbers i bitset: Handle bit-vector datatype i 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x86_64-linux files of xetex i xetexconfig: crop.cfg for XeLaTeX i xkeyval: Extension of the keyval package i xltxtra: "Extras" for LaTeX users of XeTeX i xunicode: Generate Unicode characters from accented glyphs i zapfding: URW "Base 35" font pack for LaTeX ```

FFMPEG

Output of `ffmpeg -version`: ``` ffmpeg version 3.4.8-0ubuntu0.2 Copyright (c) 2000-2020 the FFmpeg developers built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04) configuration: --prefix=/usr --extra-version=0ubuntu0.2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared libavutil 55. 78.100 / 55. 78.100 libavcodec 57.107.100 / 57.107.100 libavformat 57. 83.100 / 57. 83.100 libavdevice 57. 10.100 / 57. 10.100 libavfilter 6.107.100 / 6.107.100 libavresample 3. 7. 0 / 3. 7. 0 libswscale 4. 8.100 / 4. 8.100 libswresample 2. 9.100 / 2. 9.100 libpostproc 54. 7.100 / 54. 7.100 ```

Additional comments

[markromanmiller]

At least one of my issues is not understanding the semantics. In a simpler version, where the move and rotations happen separately, the frame_center position does stay the same while other items rotate around it.

Is there something like "move_to" that applies to cameras?

[leotrs]

Have you tried camera.frame.move_to?

[markromanmiller]

If I understand correctly, that only works for MovingCameras, which don't do 3D stuff, right? I'm using a ThreeDCamera.

[leotrs]

In that case, I have no more suggestions :disappointed:

TBH, next time I have some time I want to work on a complete rewrite of the Camera class...

[markromanmiller]

My eventual workaround was to shift everything in the scene by a specified amount. It's hacky, but this is for code I'll likely never touch again after making a video.

Unless you want to keep this issue open as a feature request, I think it should be closed.

[suhailsherif]

Fixed in PR #1821