oh, thank you
The light parameters are 4-dimensional vectors, not 3-dimensional vectors as in your code. OpenGL is currently reading the fourth component from outside the corresponding arrays.
the light is in the middle (sort of) of the room, actually closer to the ceiling than the floor, and the direction points towards the floor
What do you think is wrong with the directional light? If the light is coming from the upper left in the image, then the bottom and right faces are lit since they face the light, and the right and top faces are not lit since they are not facing the light.
I haven't looked much into the exact details of where the light is pointing, where the view point is facing, and which wall is where though, so I don't know for sure if the light really is supposed to come from the upper left. If the incorrect faces are lit, then make sure that the normals are in fact correct, and that you are viewing from the correct place.
yup i think i understand
You have a directional light, not a positional one. Spotlight settings only work for positional lights. Set the w-component of the position to 1 instead.
Also, don't expect very good results. Lighting is calculated per vertex so you need to define a much higher resolution cube to have some sensible results.
