code: public Vec3 multiply(final Vec3 vec) {
  		return new Vec3(
  				m00 * vec.x + m10 * vec.y + m20 * vec.z,
  				m01 * vec.x + m11 * vec.y + m21 * vec.z,
  				m02 * vec.x + m12 * vec.y + m22 * vec.z
  		);
  	}
docs: This is the equivalent of <strong>this * vector</strong> (if we had operator
  overloading).  If you want <strong>vector * this</strong> then
  see {@link Vec3#multiply(Mat3)}.
  
  @param vec
  @return