Mick Hazelgrove <mha### [at] mindaswinternetcouk> schrieb in im Newsbeitrag:
370a3e82.0@news.povray.org...
> Hi All
>
> when I run the following code not only do I get 100 spheres but as the
code
> loops it also draws the slab a hundred times or so.
> Can anyone suggest a way of using trace in a way that the object is only
> drawn once? Otherwise the memory hit with high samples is horrendous!
>
> Mick
>
> ===================================================
>
> #version 3.1;//Superpatch
>
> #include "colors.inc"
>
> // ----------------------------------------
> camera
> {
>   location  <0.0, 10, -20.0>
>   direction 1.5*z
>   right     4/3*x
>   look_at   <0.0, 0.0,  0.0>
> }
>
> sky_sphere
> {
>   pigment
>   {
>     gradient y
>     color_map { [0.0 color blue 0.6] [1.0 color rgb 1] }
>   }
> }
>
> light_source{<-30, 30, -30>,color rgb<1,1,1>}
>
> // ----------------------------------------
>
> #declare Step2 = box{<-2, 0, -2>< 2,  .4,  2> pigment{Yellow}}
>
> #declare Norm = <0,0,0>;
> #declare Xpos = -5;
> #declare Zpos = 5;
>
>
> #while (Xpos<6)
>
>    #while (Zpos>-6)
>
>         #declare SPos = <Xpos,1,Zpos>;
>
>         #declare Inter = trace (Step2,SPos,<0,0,0>-SPos, Norm );
>
>                 object{Step2 texture {pigment{color rgb<1,1,0>}}}
>                         #if (Norm.x != 0 | Norm.y != 0 | Norm.z != 0)
>                                 sphere{Inter,.1 texture{pigment{color red
> 1}}}
>                         #end
>     #declare Zpos = Zpos -1;
>     #end
>     #declare Zpos = 5;
>   #declare Xpos = Xpos +1;
>
> #end
>
>

looks like a macro defined somewhere else!

Hm would be nice if you could make me wiser!
Smarf

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