Alain <aze### [at] qwertyorg> wrote:

> > Warp<war### [at] tagpovrayorg>  wrote:
> >> W0RLDBUILDER<nomail@nomail>  wrote:
> >>>> #declare Star = /* your star object here */;
> >>>>
> >>>> #declare Amount = 500;
> >>>> #declare Seed = seed(0); // Try integer values other than 0 for other
> >>>>                           // distributions
> >>>> #declare MinExtent =<-100, -100, -100>;
> >>>> #declare MaxExtent =<100, 100, 100>; // Modify as desired
> >>>>
> >>>> #declare Index = 0;
> >>>> #while(Index<  Amount)
> >>>>    object
> >>>>    { Star
> >>>>      #declare RandVector =<rand(Seed), rand(Seed), rand(Seed)>;
> >>>>      translate MinExtent + (MaxExtent - MinExtent) * RandVector
> >>>>    }
> >>>>    #declare Index = Index + 1;
> >>>> #end
> >>>>
> >>>> --
> >>>>                                                            - Warp
> >>
> >>> Thanks. Would that work if I copy/pasted it several times for different types of
> >>> stars?
> >>
> >>    Better to use a macro for that, like:
> >>
> >> #macro CreateStars(StarObject, Amount, Seed)
> >>    #local MinExtent =<-100, -100, -100>;
> >>    #local MaxExtent =<100, 100, 100>; // Modify as desired
> >>
> >>    #local Index = 0;
> >>    #while(Index<  Amount)
> >>      object
> >>      { StarObject
> >>        #declare RandVector =<rand(Seed), rand(Seed), rand(Seed)>;
> >>        translate MinExtent + (MaxExtent - MinExtent) * RandVector
> >>      }
> >>      #local Index = Index + 1;
> >>    #end
> >> #end
> >>
> >> #declare Seed = seed(0);
> >> CreateStars(Star1, 100, Seed)
> >> CreateStars(Star2, 100, Seed)
> >> CreateStars(Star3, 100, Seed)
> >>
> >> --
> >>                                                            - Warp
> >
> > I can't get that to work. I know I'm doing something wrong here. It's probably
> > not a good idea to drop a macro on top of a semi-n00bish casual user who just
> > wants to place some random stars. :-P
> >
> >
>
> You only need to copy the macro definition and the macro calls into your
> scene. Make sure that the calls are placed after the macro definition.
>
> The only thing missing here, is the definitions for "Star1", "Star2" and
> "Star3".
>
> You can:
> - #declare all star objects before the calls to CreateStars()
> - #declare the star objects before each individual call. In this case,
> you can reuse the same name.
> - Define the star object inside the call itself.
>
> In the lase case, you can use this:
>
> CreateStars(sphere{0,0.1 pigment rgb<1,0.5,0.2>finish{ambient 1 diffuse
> 0}}, 100, Seed)
>
>
>
> Alain

Never mind, I got it to work with the first method in this thread. The stars I'm
using are in an include file, stars.inc. My include file #declares all the star
objects I'm using. I also managed to get a nebula.

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