content_image/297343.jpg content_image/297344.jpg content_image/297342.jpg content_image/297339.jpg content_image/297338.jpg content_image/297340.jpg content_image/297341.jpg
<img src='content_image/297343.jpg'>

<img src='content_image/297344.jpg'>

We call the set of surfaces defined by (3.1) - (3.4) spacelike surface pencil with a common line of curvature . Any surface P ( s, t ) defined by (3.1) and satisfying (3.2) - (3.4) is a member of this family. 

Now, we analyse two different types of the marching-scale functions 

u ( s, t ) , v ( s, t ) and w ( s, t ) in. the Eq. (3.1). 

(i) If we choose 

<img src='content_image/297342.jpg'>

is a line of curvature of the surface P ( s, t ) as 

<img src='content_image/297339.jpg'>

(ii) If we choose 

<img src='content_image/297338.jpg'>

line of curvature on the surface P ( s, t ) as 

<img src='content_image/297340.jpg'>

<img src='content_image/297341.jpg'>

