Equate the projection of the
-
order derivative
vector of
with respect to the arc length of the parametric
and implicit surfaces onto the unit normal vector, i.e.
, and
(6.53),
to form a linear equation in
and
, where
,
, are replaced by the components of
.
The second linear equation in
and
is
obtained from
, where
and
, which depends exlusively on
and
and their derivatives, is defined in
(6.47).
Solve the linear system for
and
substitute them into
,
.