wrote:

> documentation says about spline specification
> 
> #declare IDENTIFIER =spline { [SPLINE_IDENTIFIER]  [SPLINE_TYPE] ...
> 
> So identifier and type are both optional but can be together.
> 

The way I interpreted the changing of the spline type is that is is only 
possible when you retreive one value from the spline.

#declare P1=<0,0,0>+Spline(1,linear_spline);

Not for copying a spline. I agree that in that case the syntax section 
is not clear, is adding a pipe enough:

#declare IDENTIFIER =
  spline { 
    [SPLINE_IDENTIFIER] |
    [SPLINE_TYPE] 
    ...

Then again, the current spline implementation is marked experimental and 
has several bugs, so I'm not sure how it should/will work and what to 
change in the docs. I'll put your remark in the todo list and wait for a 
more final spline before changing the docs.


Ingo

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