In article <knselu81q1h2qm5s0qgcbnt1h24f2426ou@4ax.com> , ABX 
<abx### [at] babilonorg>  wrote:

> I don't know function code
> yet enough so have no idea what could be wrong.

Easy:  The code handling vector functions assumes three or more return
values and acts a bit strange when dealing with only two.  The way you
declare the spline you create a two diemensional spline, which is what
causes the odd effects.  Add a 3D vector to the spline and it goes away.

    Thorsten

____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

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