Alain <ele### [at] netscapenet> wrote:
> Katherina nous apporta ses lumieres en ce 2007/08/08 05:03:
> >
> > I'm new at Povray.
> >
> > I use the following code in order to find intersection of 30 planes and 19
> > quadratics, plane normals and points are given in 2-dimensional array p and
> > q, coefficients of quadratics given in 2-dimensional array qq.
> >
> > But I got the following error message: in qq[j]: "array subscript out of
> > range"
> >
> > Maybe it is trivial but I didn't understand why? Can somebody help me?
> >
> >   #declare i=0;
> >   #declare j=0;
> >
> >
> >   #while (i<31)
> >
> >
> >   intersection{
> >
> >   plane
> > {<p[i][0],p[i][1],p[i][2]>,p[i][0]*q[i][0]+p[i][1]*q[i][1]+p[i][2]*q[i][2]
> > }
> >
> >
> >   quadric
> >   {
> >
> >
<qq[j][2],qq[j][4],qq[j][6]>,<qq[j][7],qq[j][8],qq[j][9]>,<qq[j][1],qq[j][3],qq[j][5]>,qq[j][0]
> >
> >   }
> >
> >   }
> >
> >
> >   #declare i=i+1;
> >
> >     #if (j<20)
> >       #declare j=j+1;
> >   #end
> >
> >   #end
> >
> >
> After the last time your test on "j" succeede, j = 20. Your array's last element
> is 19, you want to access element 20 whitch don't exist.
> Solution:
> Use 2 successive #while loops. The first one been only for the planes, the
> second only for the quadrics.
>
> The order of the elements of the intersection have no impact: All components
> after the first are intersected from the first one.
>
> --
> Alain
> -------------------------------------------------
> You know you've been raytracing too long when you were ever dragged out of a
> theater for yelling "Cheap rasterized graphics!!!" in the middle of Toy Story.
> Stephan Ahonen

Now I changed my code and put 2 successive #while loops here is my new code,
but still it gives same error message, I really do not understand why?




  #declare i=0;
  #declare j=0;


  #while (i<31)


    #while (j<20)


  intersection{

  plane
{<p[i][0],p[i][1],p[i][2]>,p[i][0]*q[i][0]+p[i][1]*q[i][1]+p[i][2]*q[i][2]
}


  quadric
  {

<qq[j][2],qq[j][4],qq[j][6]>,<qq[j][7],qq[j][8],qq[j][9]>,<qq[j][1],qq[j][3],qq[j][5]>,qq[j][0]

  }

  }


  #declare i=i+1;
  #declare j=j+1;

  #end

  #end

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