Decal();
Decal(XYZ position, decal_type type, float opacity, float rotation, float brightness, int whichx, int whichy, float size, const Terrain& terrain, bool first);
Decal();
Decal(XYZ position, decal_type type, float opacity, float rotation, float brightness, int whichx, int whichy, float size, const Terrain& terrain, bool first);