1. The direction perpendicular to a surface, plane, or curve at a given point, typically represented by a unit vector
The normal vector direction is used to determine the orientation of a surface in 3D space.
A direção do vetor normal é usada para determinar a orientação de uma superfície no espaço 3D.
2. In geometry and computer graphics, the direction pointing outward from a surface, used for lighting calculations and rendering
The normal vector direction affects how light reflects off the object's surface.
A direção do vetor normal afeta como a luz se reflete na superfície do objeto.