Specular lighting represents shiny materials by modelling the reflection of light sources on the object. Shiny materials reflect light more strongly in the direction opposite the angle of incidence. This means that unlike diffuse lighting, the position of the camera/viewer now plays a role in the lighting calculation.
Specular Lighting - Tutorial 26
Specular lighting represents shiny materials by modelling the reflection of light sources on the object. Shiny materials reflect light more strongly in the direction opposite the angle of incidence. This means that unlike diffuse lighting, the position of the camera/viewer now plays a role in the lighting calculation.
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Chapter 11 of this great resource
Learn OpenGL - Basic Lighting