sci.physics.computational.fluid-dynamics

Hi, I have written an algorithm for calculating surface streamlines on
a surface of a body. Though i am having a little difficulty locating
proper seed points. I don't want to use any external seed point
generator such as a plane intersecting with the body and then using
the intersection points as seed points. Rather if it is possible to
use one of the properties ( like VelocityX, VelocityY, VelocityZ or
the velocity Magnitude ) to caculate the seed points then it would be
much better. What I basically want to do is that as soon as the user
clicks on the "Surface Streamline" option , good streamlines covering
the whole body is generated without involving user inputs. Can someone
please help me come up with an idea to generate such seed points?