Spy backstab detection mechanics illustrated

Whether or not a particular knife attack is a backstab is determined by the result of three vector dot products. This video should help show visually how all of this stuff operates, even for people who don t know what a vector or dot product is. In the first video segment, the yellow vector is the horizontal part of the spy s aim direction ( SpyView ); the magenta vector is the horizontal part of the heavy s aim direction ( VictimView ); and the cyan vector is the horizontal part of the vector pointing