in news:cW9### [at] econymdemoncouk Mike Williams wrote:

> I would prefer to retain the "param.inc" versions of the examples on
> my Isosurface tutorial page, because they are so much faster than
> real parametrics. At the moment over half of them fail to run under
> RC2. 
> 

Think you misunderstood me, the code was from an newer version of
param.inc that accepts functions directly and looks even more like the
parametric object. 

Now to one of your example files (IngoSpline04b.pov), it uses the cubic
spline that returns the same value in the range t=-1 to 0 and t=17 to
18. This results in the vnormalize error. Two solutions: 

1. use an other spline type.

2. move #include "param.inc" to the top of the file,
   change Umin and Umax to:
   #declare Umin =  FromU(0);
   #declare Umax =  ToU(17);

Ingo

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