Katherina nous apporta ses lumieres en ce 2007/08/08 06:46:

> 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;
The declaretion of the indexing MUST ALWAYS immediately precede the coresponding 
#while statement.
> 
> 
>   #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;
You must NEVER alter any indexing variable inside any loop but it's own. Here, 
you increase both in the inner loop.
>   #declare j=j+1;
> 
>   #end
> 
>   #end
>

You need to start with the intersection and put the loops inside the 
intersection. Secondly, put the 2 loops one after the other, not one inside the 
other.

intersection{
#declare I = 0;
#while(I < 31)
Your_planes
#declare I = I + 1;
#end// terminate the intersection of planes
#declare I = 0;// you can reuse the same variable
#while(I < 20)
Your_quadrics
#declare I = I + 1;
#end// terminate the intersection of quartics
texture{Your_texture}// unless you need each part to provide it's own texture
}// End of the intersection


-- 
Alain
-------------------------------------------------
'hAS ANYONE SEEN MY cAPSLOCK KEY?'

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