Game Physics Cookbook

Dot product

The dot product, sometimes referred to as scalar product or inner product between two vectors, returns a scalar value. It's written as a dot between two vectors, . The formula for the dot product is defined as follows:

The sigma symbol means sum (add) everything up that follows. The number on top of the sigma is the upper limit; the variable on the bottom is the lower limit. If n and i is 0, the subscripts 0, 1, and 2 are processed. Without ...