Define here the brightness of the solid objects.
Shininess
This parameter controls the level of metallic brightness shown by solid objects, 
when submited to lights with some specular component.
When 
Shininess is 
0.0 (the minimum value), no
brightness is visible. When 
Shininess is 
1.0 (the maximum
value), the brightness is usually so strong that most color effects
are lost and objects look mostly white.
This parameter is global: all solid objects in GAMGI have the same 
Shininess.