friend inline Vector4 Multiply34(const Vector4& a, const Vector4& b) { return Vector4(a.x*b.x, a.y*b.y, a.z*b.z); }
friend inline Vector4 Multiply34(const Vector4& a, float f) { return Vector4(a.x*f, a.y*f, a.z*f); }
	friend inline Vector4 Multiply34(const Vector4& a, const Vector4& b)	{ return Vector4(a.x*b.x, a.y*b.y, a.z*b.z); }