Function cross

cross<T>(a, b, dst?): T
Computes the cross product of two vectors; assumes both vectors have three entries.
Type Parameters
- T extends BaseArgType = number[]
Parameters
- a: BaseArgType
  Operand vector.
- b: BaseArgType
  Operand vector.
- Optional dst: T
  vector to hold result. If not passed in a new one is created.
Returns T
The vector of a cross b.