Matija nous illumina en ce 2009-02-15 06:49 -->
> Hi!
> 
> I've been tryin to make somethign resembling an onion an cutting it away. Not
> that I want it to look as an onion, just a bunch of concentric spheres. I
> wanted to use the #while loop so that I wouldn't need to type much and could
> change stuff easily. But only the first iteration seems to run OK, then it gets
> weird. Could you please llok at my code, run it and help? Thanks!
> 
> Matija
> 
> 
>   #include "colors.inc"
>   #include "glass.inc"
>   #include "skies.inc"
>   #include "textures.inc"
>     background{White}
> 
>     camera {
>     angle 15
>     location <3,12,10>
>     look_at <0,0,0>
>     }
>     light_source { <12, 5, 3> color White }
> 
> #declare Stevec=1;
> #declare Rad1 = 1;
> #declare Rad2 = 0.1;
> 
> #declare Onion =
> 
>         #while (Stevec >= 0.2)
>                 #declare Rad1=Stevec;
>                 #declare Rad2=Rad1-0.1;
>                 difference {
>                         sphere {<0,0,0>, Rad1}
>                         sphere {<0,0,0>, Rad2 hollow} cutaway_textures}
>                 #declare Stevec=Stevec-0.2;
> 
>         #end
> 
> intersection {
>          object {Onion pigment {color Green}}
>         box {<0,-1,-1>
>                 <-1,1,1>
>                 pigment {color Blue}}
>                 }
> 
> 
Just une an union for your "Onion" object:

#declare Onion =
	union{
         #while (Stevec >= 0.2)
                 #declare Rad1=Stevec;
                 #declare Rad2=Rad1-0.1;
                 difference {
                         sphere {<0,0,0>, Rad1}
                         sphere {<0,0,0>, Rad2 }
			}
                 #declare Stevec=Stevec-0.2;

         #end
	}

You don't need hollow as your objects are not intended to contain any media. 
Anyway, hollow won't have any effect where it's used.

You don't need cutaway_textures either, as your object only have a single 
texture that's applyed after it's deffined.

-- 
Alain
-------------------------------------------------
Rebellion against tyrants is obedience to God.
Benjamin Franklin

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