Jim Holsenback <jho### [at] povrayorg> wrote:
> On 11/01/2010 08:14 AM, nip wrote:
> > Hello!
> >
> > I'm wondering if there's a way to supply variables\values to a union object to
> > alter the way it is rendered. I'm not sure if I've worded that correctly, so
> > consider the code below. I'm trying to rotate the top box on the second figure,
> > but leave the first figure as-is. Is something like this possible or would I
> > need completely separate declarations for each "pose".
> >
> > Thanks for any help you can offer.
> > -nip
> >
> >
> >
> > Sample code:
> >
> > #include "colors.inc"
> >
> > #declare Tilted = 0.0;
> >
> > #declare Figure = union {
> >     box {
> >         <0, 0, 0>, <1, 1, 1>
> >         pigment { Green }
> >     }
> >
> >     box {
> >         <0, 0, 0>, <1, 1, 1>
> >         pigment { Blue }
> >
> >         #if (Tilted > 0)
> >             rotate z*15
> >         #end
> >
> >         translate y*1
> >     }
> > }
> >
> > object { Figure }
> >
> > object {
> >     #declare Tilted = 1; //this does not make the right blue box rotate
> >     Figure
> >     translate <2, 0, 0>
> > }
> >
> >
> > camera {
> >     location <5, 1, -5>
> >     look_at <0, 1, 3>
> > }
> >
> >
> > light_source {
> >     <5, 1, -5>
> >     color rgb <1, 1, 1>
> > }
> >
> >
> >
>
> a macro is what you need:
>
http://wiki.povray.org/content/Documentation:Reference_Section_2.6#The_.23macro_Directive
>
> you problem is a simple one so I'll get you started, give this a whirl:
> #macro Figure (Tilted)
> union {
>     box {
>         <0, 0, 0>, <1, 1, 1>
>         pigment { Green }
>     }
>
>     box {
>         <0, 0, 0>, <1, 1, 1>
>         pigment { Blue }
>
>         #if (Tilted > 0)
>             rotate z*15
>         #end
>
>         translate y*1
>     }
> }
> #end
>
> object { Figure (0)  }
> object { Figure (1) translate <2,0,0> }

Excellent! Macros look pretty powerful. Thanks

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