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> }

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