Выдержка из оригинальной справки. (NDL Gamebryo 1.1)
The "Gloss" map field holds a texture that will modulate the effect of an environment map. The environment map and gloss map are multiplied together so the environment map will show wherever the gloss map is white, appearing mirror-like, not show wherever it is black, appearing dull and diffuse, and smoothly transition anywhere in between. Colors and shades in between can be used to represent partial reflectivity or even colored reflectivity for metallic effects. For example, parts of a gloss map that are painted yellow will tend to make those parts of the object look like polished gold—while other parts look flat. The gloss map need not be a constant color.
