Ogre Lexicon  »  -Specular (Light)

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Specular (Light) - Light which reflects more intensely along and around the reflection vector? from a surface. This is used to add highlights to a surface to make it look shiny. The specular effect is not only affected by the relationship between the surface and the -light, but also the viewer - since if the viewer is close to the reflection vector on that surface, they will see a bright spot at the point of reflection.

Specular reflection of light on a sphere