question: copy the vector concode_field_sep double x concode_elem_sep double y concode_elem_sep double z concode_field_sep void add concode_elem_sep Vector3d add concode_elem_sep void sub concode_elem_sep Vector3d sub concode_elem_sep void setY concode_elem_sep void setX concode_elem_sep void mult concode_elem_sep Vector3d mult concode_elem_sep double distance concode_elem_sep double dot concode_elem_sep Vector3d cross concode_elem_sep void setZ concode_elem_sep void div concode_elem_sep Vector3d div concode_elem_sep double angleBetween concode_elem_sep double heading2D concode_elem_sep void setXYZ concode_elem_sep void setXYZ concode_elem_sep void rotate2D concode_elem_sep Vector3d rotate2D concode_elem_sep void normalize concode_elem_sep void limit concode_elem_sep double magnitude concode_elem_sep String toString
target: Vector3d function ( ) { return new Vector3d ( x , y , z ) ; }