Specularity
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Specular highlights on a pair of spheres.
Specularity is the quantity used in 3D rendering which represents the amount of specular reflectivity a surface has. It is a key component in determining the brightness of specular highlights, along with shininess to determine the size of the highlights.
It is frequently used in real-time computer graphics where the mirror-like specular reflection of light from other surfaces is often ignored (due to the more intensive computations required to calculate this), and the specular reflection of light direct from point light sources is modelled as specular highlights.
