Try using "Stream Tracer With Custom Source", and passing an extract
selection from the surface as the seed input. There are some caveats
to this if working in parallel.

Utkarsh

On Mon, Jan 18, 2010 at 4:03 PM, Fred Fred <[email protected]> wrote:
> Consider an arbitrary surface with tangent vectors defined on it. How do you
> do for computing streamlines on such a surface? I mean how do you place seed
> points? Placing seeds on a shere or on a line does not work since of course
> seed points are not on the surface.
>
>
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