"Katherina" <nomail@nomail> wrote in message 
news:web.46b9ad588df9ac53d7b596fc0@news.povray.org...
> I'm very new at Povray.
>
>
> I want 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.
>
>
>  #declare i=0;
>  #declare j=0;
>
>
>  #while (i<30)
>
>
>  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]
> }
> pigment { color Red}
> }
>
>   #while (j<19)
>
>  intersection {
>
>  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]
>
>  }
>  pigment { color Red}
> }
>  #declare j=j+1;
>
>  #end
>
>
>  #declare i=i+1;
>
>  #end
>
>
> camera {
>  location <10,10,50>
>  look_at 0
> }
> light_source { <10, 10, 10> White }
> plane { y, -2 // y means <0,1,0>
>  pigment { color Yellow}
>
> }
>
>
> I just see a black screen, why?
>

See the other thread about nesting the loops like that.

Is it possible that the light source or the camera end up inside the shape?

Regards,
Chris B.

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