Fragula lets you view your fragment shader changes in real time. Simply save your fragment shader while editing and watch your changes appear in the Fragula window in real-time.
To install Fragula run cargo install fragula in a terminal prompt.
To use Fragula you can run fragula in a terminal with the path to the
OBJ file and fragment shader you would like to use:
$ fragula my_3d_model.obj fragment.glsl
