Now suppose that the object is shiny''. If it were a perfect mirror, then all of the light from the source would be reflected to the pixel only if they are perfectly aligned; otherwise, no light would reflect at all. Such full reflection would occur if and form the same angle with respect to . What if the two angles are close, but do not quite match? The Blinn-Phong shading model proposes that some amount of light is reflected, depending on the amount of surface shininess and the difference between and [24]. See Figure 7.3. The bisector is the vector obtained by averaging and :