Change here the visual aspect of a direction (or list of directions, 
previously selected with Direction->Select, when 
Global is pressed).
Parameters for empty entries or 
Local choices remain unchanged.
R, G, B
The 
R, 
G, 
B entries define the direction color,
from black (0.0, 0.0, 0.0) to white (1.0, 1.0, 1.0).
Scale
When the direction is linked in 
Independent mode, the 
Scale
factor can be used to change the direction size, including its child objects. 
Direction objects are scaled around the direction center.
When the direction is linked in 
Automatic mode, only its parent 
object can be scaled (thus changing the size of all its child objects, 
including the direction), and the 
Scale entry is disabled.
The visual representation of an object is always scaled by its own 
scale factor multiplied by the scale factor of all its parent objects 
until layer, inclusive.