Texture exists on box but not visible on it

I am graphing some maths with x axis 5120 on 10x 512 512 texture boxes.

The resulting graph is visible inside the box but not on it’s surface, i don’t know why.previously the texture was visible at 50 centimeters from the boxes but not further away.

What’s happening?

tex.Apply(true,false);

I was applying texture and not updating the bitmaps, copied the line wrong from somewhere it has to be as above.