Unfortunately, that doesn't seem to solve it...
the only thing that makes it right is changing the way it draws the lines. 
if I use a for loop on the y axis drawing horizontal lines, like this:

for y in range(0, window.height):
>     pyg.graphics.draw(2, pyg.gl.GL_LINES, ('v2i', (0, y, window.width, 
> y)), ('c3f', (1, 1, 1)*2))


the screen is drawn correctly. 

Il giorno martedì 3 ottobre 2017 04:10:09 UTC+2, Benjamin Moran ha scritto:
>
> Hi Mattia,
>
> Welcome! 
> Looks like you just need a call to window.clear() at the start of your 
> on_draw event handler.
>
> Otherwise you end up seeing random GPU memory.
>
>

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