Change here the visual aspect of the layer (or list of layers, previously
selected with Layer->Select, when 
Global is pressed).
Parameters for empty entries or 
Local choices remain unchanged.
R, G, B
The 
R, 
G, 
B entries define the color of the layer 
background, from black (0.0, 0.0, 0.0) to white (1.0, 1.0, 1.0). When
multiple layers are visible, GAMGI always shows the background color 
of the current layer.
Axes
To show the layer referential axes, set the 
Axes option to 
Yes.
The three axes use the rgb color scheme: red for the first axis, green
for the second and blue for the third.
Scale
Change the size of everything contained in the layer, except lights.
Layer objects are scaled around the layer center, defined by the 
Center parameter.
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.