I posted to newusers, but I guess you gurus in patch land would be more
likely to know the answer...

Any help greatly appreciated.

"Spock" <spo### [at] nospamcom> wrote in message
news:3a841cf4$1@news.povray.org...
> Hi,
>
> I wanted to use the spline extensions (as found in MegaPov 0.7) in a macro
> but I can't get it to work.  The code below works, but what I really want
to
> do is initialize the spline based on arguments to the macro (using the
> init_3d_spline line that is commented out).  If I comment out the
> initialization based on d1,d2,d3,d4 (outside the macro) and try to use the
> one based on p1,p2,p3,p4 (inside the macro) instead I get an error: "at
> least two knots per spline".
>
> If you have any thoughts on what I am doing wrong I would really
appreciate
> hearing from you.
>
> Thank you
>
> #version unofficial MegaPov 0.7;
>
> light_source { < 1000, 1000, -1000 > color rgb < 1, 1, 1 > }
>
> camera
> {
>     location < 0, 0, -10 >
>     look_at < 0, 0, 0 >
> }
>
> #macro _Hose( p1, p2, p3, p4 )
>
>     //#init_3d_spline { "_spline", p1, p2, p3, p4 }
>
>  union
>  {
>   sphere { p1 0.1 pigment { rgb < 1, 0, 0 > } }
>   sphere { p2 0.1 pigment { rgb < 1, 0, 0 > } }
>   sphere { p3 0.1 pigment { rgb < 1, 0, 0 > } }
>   sphere { p4 0.1 pigment { rgb < 1, 0, 0 > } }
>
>   #declare c = 0;
>   #while ( c < 1 )
>     sphere { eval_3d_spline( "_spline", c ), 0.05 }
>     #declare c = c + 0.01;
>   #end
>  }
>
> #end
>
> #declare d1 = < -2, 0, 0 >;
> #declare d2 = < -1, 0, 0 >;
> #declare d3 = < 1, 1, 0 >;
> #declare d4 = < 2, 1, 0 >;
>
> #init_3d_spline { "_spline", d1, d2, d3, d4 }
>
> object
> {
>  _Hose( d1, d2, d3, d4 )
>  pigment { rgb < 1, 1, 1 > }
> }
>
>
>

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