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

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