Выдержка из оригинальной справки. (NDL Gamebryo 1.1)
Decal maps are useful for adding confined detail to a large base map. Examples include damage scorch marks, bullet holes, skid marks, and lettering. The "Decal" map field holds a texture that will be alpha blended on top of the base texture. Unlike other forms of multi-texture, a single object may have more than one decal map. Unlike other "slots" in the multi-texture property, there is an entire array of decal slots. Decals are applied in the order in which they appear in the array—creating a layering effect. The Gamebryo 3ds max Plug-in will translate each texture listed in the "Composite" material into a decal texture. As a result, decals can be made to overlay not only the base texture, but each other as well. Each decal can have its own set of texture coordinates (UVs), and can thus be applied independently.
A detail and a Decal map are applied to the scene shown here. The decal is the badly drawn crack in the wall while the detail map is the tilling dirt applied to the wood floor. Dark maps are also applied to the floor and walls to create the static lighting effects.
