Assertion: texture | /r/CapableOf | control facing direction of a surface
Facets:
value: directly
type: MANNER
Source sentences:
text: Another multitexture technique is bump mapping, which allows a texture to directly control the facing direction of a surface for the purposes of its lighting calculations; it can give a very good appearance of a complex surface (such as tree bark or rough concrete) that takes on lighting detail in addition to the usual detailed coloring.