Wasn't it ingo who wrote:
> From the scene below the expected result is a square, yet I get a 
>thing like:
> ____
>|    |
>|  \ |
>|   \|
>
> When the first point of the spline is omitted, the result is a square. 
>I.M.O the first point should be of no influence when using a 
>linear_spline.
> When using a quadratic or cubic spline something simmiliar happens, 
>with the first point the shape is not closed. Without the first point 
>the shape is closed, but not smooth at the point where it closes.

The bug with splines that have 0 as a control value isn't fixed yet.

The workaround is to change your "0" control point into a small non-zero
value, like

#declare Spl=spline{
   -0.25,<0,1,0>,
    0.001,<0,0,0>, // instead of 0,<0,0,0>
    0.25,<1,0,0>,
    0.50,<1,1,0>,
    0.75,<0,1,0>,
    1,   <0,0,0>,
    1.25,<1,0,0>,
}

Which produces the square correctly.

-- 
Mike Williams
Gentleman of Leisure

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