face normals

face normals
нормали граней
векторы, которые определяют направление, в котором обращена поверхность грани. Если нормаль грани указывает в направлении наблюдателя, то соответствующие грани видны как при отображении, так и в визуализированном изображении. Нормали граней могут быть перевернуты или замещены двухсторонними материалами.

English-Russian terms in computer graphics and 3D. 2005.

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