Table of Contents

• Cross Product

Cross Product

• Only in three-dimensional space
• The cross product a × b is defined as a vector c that is perpendicular to both a and b

2D Game Use Case

• Cross product of two 2D vectors is not a 2D vector; instead, it is a scalar.
• The sign of the cross product of 2D vectors tells you
• whether the second vector is on the left or right side of the first vector

float cross(const Vec2 &a, const Vec2 &b)
{
    return a.x * b.y - a.y * b.x;
}