
Definition of Surface normal
1. Noun. (context: differential geometry) A unit vector at any given point ''P'' of a surface ''M'' which is perpendicular to the tangent plane ''T_{P}(M)'' of ''M'' at ''P''. For a surface with parametrization $\backslash vec\; x(u,v)$, it is given by ¹
¹ Source: wiktionary.com
Surface Normal Pictures
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