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In OpenGL the 'shininess' lighting parameter is floating point value limited to the range 0.0→128.0. This number is used to affect the size of the specular highlight. Cogl materials used to only accept a number between 0.0 and 1.0 which then gets multiplied by 128.0 before sending to GL. I think the assumption was that this is just a weird GL quirk so we don't expose it. However the value is used as an exponent to raise the attenuation to a power so there is no conceptual limit to the value. This removes the mapping and changes some of the documentation. http://bugzilla.clutter-project.org/show_bug.cgi?id=2222