detail: http://cg.csie.ntnu.edu.tw/AdvCG/Assignment1.pdf
According to input file, it is a left-hand coordinate.
According to senpai, F(fov) represent for horizontal angle.
- pyenv
- python 3.x
- numpy
- scipy
- python 3.x
Q: ImportError: No module named '_tkinter'
# http://stackoverflow.com/questions/26357567/cannot-import-tkinter-after-installing-python-3-with-pyenv
$ sudo apt-get install tk-dev
$ pyenv install $YOUR_PYTHON3_VERSION