A decal is slightly similar to a facer, only instead of being a freestanding texture, it is overlaid dynamically upon a texture of an existing polygon. Decals are meant to represent player generated change to the environment without actually changing the geometry. Bullet holes and blood on walls in videogames are both examples of decals.
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For all their promise, solar cells have frustrated scientists in one crucial regard – most are rigid. They must be deployed in stiff, often heavy, fixed panels, limiting their applications. So researchers have been trying to get photovoltai...