The specifics are covered in the documentation here
<http://pyglet.readthedocs.org/en/latest/programming_guide/graphics.html>,
but to break down this particular example:
self.render.add(*number of vertex points*, *rendering mode for square*, *
group number*,
*vertex coordinates*,
*texture coordinatess*)
'v3f' is short form for 3 floating point coordinates (xyz) for each vertex
(4 in this case), and 't3f' is short for 3 floating point coordinates given
by the textures tex_coords value.
If you don't use groups, then I believe you'd have to set up multiple
batches to render each separate image. This might not be that bad if you
use a Texture Atlas to group all the images you want to render on a single
texture, but they still have a limit to how big you can make them
(2000x2000 - 4000x4000, depending).
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