Remco de Korte wrote:

> /*
> There's something weird with the following code:
> */
>
> camera{location <0,0,-13.5> look_at<0,0,0> angle 30}
>
> light_source{<-200,100,-150> color rgb <1,1,1>.1}
>
> plane{z,600 hollow on pigment{rgb .25}}
>
> #declare xx=1.9;
> #declare yy=.5;
>
> merge{
>   sphere{<-xx,-yy,0>,.1}
>   sphere{<xx,-yy,0>,.1}
>   sphere{<-xx,yy,0>,.1}
>   sphere{<xx,yy,0>,.1}
>   cylinder{<-xx,-yy,0><xx,-yy,0>,.1}
>   cylinder{<-xx,yy,0><xx,yy,0>,.1}
>   cylinder{<-xx,-yy,0><-xx,yy,0>,.1}
>   cylinder{<xx,-yy,0><xx,yy,0>,.1}
>
>   cylinder{<-xx,-yy,0><-xx,-yy,5>,.1}
>   cylinder{<xx,-yy,0><xx,-yy,5>,.1}
>   cylinder{<-xx,yy,0><-xx,yy,5>,.1}
>   cylinder{<xx,yy,0><xx,yy,5>,.1}
>
>   box{<-xx,-yy-.1,0><xx,yy+.1,5>}
>   box{<-xx-.1,-yy,0><xx+.1,yy,5>}
>   pigment{rgb 5}
> }
>
> /*
> What you should get is a bevelled box.
> If I make this into a union it's okay,
> but with merge the inner part is gone.
>
> Is this some known weird merge-behaviour
> or am I making a stupid mistake?
> (I thought union and merge should look
> the same on the outside)
>
> Cheerio,
>
> Remco

You have coincident surfaces. Use this code instead:

merge {
  sphere{<-xx,-yy,0>,.1}
  sphere{<xx,-yy,0>,.1}
  sphere{<-xx,yy,0>,.1}
  sphere{<xx,yy,0>,.1}
  cylinder{<-xx,-yy,0><xx,-yy,0>,.1}
  cylinder{<-xx,yy,0><xx,yy,0>,.1}
  cylinder{<-xx,-yy,0><-xx,yy,0>,.1}
  cylinder{<xx,-yy,0><xx,yy,0>,.1}

  cylinder{<-xx,-yy,0><-xx,-yy,5>,.1}
  cylinder{<xx,-yy,0><xx,-yy,5>,.1}
  cylinder{<-xx,yy,0><-xx,yy,5>,.1}
  cylinder{<xx,yy,0><xx,yy,5>,.1}

  box{<-xx,-yy-.1,0.00001><xx,yy+.1,5>}
  box{<-xx-.1,-yy,0><xx+.1,yy,5>}
}

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