exterior normal的意思|示意

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Exterior normal is a term used in geometry to describe a vector that is perpendicular to a surface at a certain point. It is also referred to as an outward normal as it always points away from the surface. It is typically represented as a vector in 3D space and is most often used when dealing with polygonal shapes.

Exterior normal is used in a variety of fields, most notably in computer graphics, computer animation, and physics. In computer graphics, the vector is used to calculate the reflection of light off a surface. In computer animation, it is used to describe how a 3D object moves and interacts with other objects. In physics, exterior normals are used to calculate the surface tension and potential of a material.

The vector equation for an exterior normal is:

N = (x1, y1, z1) × (x2, y2, z2)

Where x1, y1, z1 and x2, y2, z2 are the x, y, and z coordinates of two points on the surface of a polygon at the point that the vector is being calculated. The result of the equation will be a vector that is perpendicular to the surface in 3D space.

Overall, exterior normal is a useful tool in many different fields, as it can help us calculate the properties of a surface and the interactions that take place on it. It is an important concept to understand when dealing with 3D objects and the calculations involved with them.