This field cans takes two strings. One for horizontal and one for vertical justification. If you change one of fields horizontal , leftToRight or topToBottom you can change direction of text for vertical, from right to the left and from bottom to top. In language field you can choose language from utf8 standard. The human system operates by receiving light reflected by object in the world.
Virtual worlds try to mimic the real world as close as possible.
It means light too, but calculating every bit of light from every possible source is not practical for real-time rendering. Shortcuts are need. First, the light is computed only for vertexes of the objects. The surfaces are then colored by interpolating colors. Before the color of the vertex can be computed the renderer must know the source of all the possible lights in the scene.