set_shininess
Description:
Sets the shininess of the material, in the standard OpenGL lighting model, which determines the size of the specular highlights.
Note: 
      
        
    
    Use the CoglSnippet shader api for lighting
 A higher shininess will produce smaller highlights which makes the object appear more shiny.
The default value is 0.0
Parameters:
| this | 
           A   | 
      
| shininess | 
           The desired shininess; must be >= 0.0  |