inc
Overloads the unary increment operator (++).
Returns a new Vector4 instance where each component (x, y, z, and w) of this vector has been incremented by 1.0f. This operation does not modify the original Vector4 instance.
When this operator is used on a var variable (e.g., v++), the variable v will be reassigned to the new, incremented Vector4 instance.
Return
A new Vector4 with components (this.x + 1f, this.y + 1f, this.z + 1f, this.w + 1f).