- (differential geometry) A unit vector at any given point
*P*of a surface*M*which is perpendicular to the tangent plane*T*of_{P}(M)*M*at*P*. For a surface with parametrization , it is given by

- where the sign can be chosen at will.

Noun

- (differential geometry) A unit vector at any given point
*P*of a surface*M*which is perpendicular to the tangent plane*T*of_{P}(M)*M*at*P*. For a surface with parametrization , it is given by

- where the sign can be chosen at will.

English Wiktionary. Available under CC-BY-SA license.

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**MLA Style**

"surface-normal." YourDictionary, n.d. Web. 14 January 2019. <https://www.yourdictionary.com/surface-normal>.

**APA Style**

surface-normal. (n.d.). Retrieved January 14th, 2019, from https://www.yourdictionary.com/surface-normal

In 3D graphics, an imaginary line that is perpendicular to the surface of a polygon. It may be computed at the vertex of a triangle, in which case it is the average of all the vertices of adjoining triangles. Or, it may be computed for each pixel in the triangle as in Phong shading. Surface normals are used to derive the reflectivity of a light source shining onto an object. See tessellation, triangle, Phong shading and Gouraud shading.

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Cite this page

**MLA Style**

"surface-normal." YourDictionary, n.d. Web. 14 January 2019. <https://www.yourdictionary.com/surface-normal>.

**APA Style**

surface-normal. (n.d.). Retrieved January 14th, 2019, from https://www.yourdictionary.com/surface-normal