LÖVE

In one of my projects, i use the command love.graphics.polygon('fill', pointList) and the filling is a bit off...
To verify, i make my code to do both 'line' and 'fill' : And, as you can see, both commands don't show the same results !
Any particular reasons why the filling doesn't follow the outer line ?
Something to do with convexity ?

Yes, the fill mode needs the polygon to be simple and convex or the results may be buggy: love.graphics.polygon, 4th line

How did i missed that line ...
Okay... lg.polygon just became from quite useful to almost useless...
Now, i "just" have to write my own >.<

You can write an algorithm to split it to convex polygons.
The easiest way is to split it to triangles, because that requires no computations whatsoever, but you get the gist.

By the way, this isn't really related to Love2D but rather to OpenGL. That's why polygons were removed ages ago.

I suspected openGL
But since i just want to draw what's underneath my floor, i made a quadrature. Seems to work fine without much perf decrease.
Triangular meshing is not for now xD